Airworthiness Directives; Bombardier Model CL-600-2C10 (Regional Jet Series 700, 701, & 702) Airplanes, Model CL-600-2D15 (Regional Jet Series 705) Airplanes, and Model CL-600-2D24 (Regional Jet Series 900) Airplanes, 11335-11341 [06-2159]

Download as PDF Federal Register / Vol. 71, No. 44 / Tuesday, March 7, 2006 / Proposed Rules the FAA proposes to amend 14 CFR part 39 as follows: PART 39—AIRWORTHINESS DIRECTIVES 1. The authority citation for part 39 continues to read as follows: Authority: 49 U.S.C. 106(g), 40113, 44701. § 39.13 [Amended] 2. The Federal Aviation Administration (FAA) amends § 39.13 by adding the following new airworthiness directive (AD): Empresa Brasileira de Aeronautica S.A. (EMBRAER): Docket No. FAA–2006– 24076; Directorate Identifier 2006–NM– 015–AD. (2) Before using any AMOC approved in accordance with § 39.19 on any airplane to which the AMOC applies, notify the appropriate principal inspector in the FAA Flight Standards Certificate Holding District Office. Related Information (i) Brazilian airworthiness directive 2005– 12–03 , effective January 19, 2006, also addresses the subject of this AD. Issued in Renton, Washington, on February 22, 2006. Michael J. Kaszycki, Acting Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. 06–2158 Filed 3–6–06; 8:45 am] BILLING CODE 4910–13–P Comments Due Date (a) The FAA must receive comments on this AD action by April 6, 2006. DEPARTMENT OF TRANSPORTATION Affected ADs (b) None. 14 CFR Part 39 Federal Aviation Administration Applicability (c) This AD applies to EMBRAER Model EMB–120, –120ER, –120FC, –120QC, and –120RT airplanes as identified in EMBRAER Service Bulletin 120–36–0016, Revision 01, dated October 4, 2004; certificated in any category. Unsafe Condition (d) This AD results from fuel system reviews conducted by the manufacturer. We are proposing this AD to prevent a potential source of ignition near a fuel tank, which, in combination with flammable fuel vapors, could result in a fuel tank explosion and consequent loss of the airplane. Compliance (e) You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done. Replacing the Shut-Off and Crossbleed Valves (f) Within 5,000 flight hours after the effective date of this AD, replace the shut-off and crossbleed valves of the bleed air system with new shut-off and crossbleed valves having hermetically sealed switches, in accordance with EMBRAER Service Bulletin 120–36–0016, Revision 01, dated October 4, 2004. sroberts on PROD1PC70 with PROPOSALS Parts Installation (g) As of the effective date of this AD, no person may install any shut-off or crossbleed valve of the bleed air system with any shutoff or crossbleed valve that does not have hermetically sealed switches. Alternative Methods of Compliance (AMOCs) (h)(1) The Manager, International Branch, ANM–116, Transport Airplane Directorate, FAA, has the authority to approve AMOCs for this AD, if requested in accordance with the procedures found in 14 CFR 39.19. VerDate Aug<31>2005 16:19 Mar 06, 2006 Jkt 208001 [Docket No. FAA–2006–24074; Directorate Identifier 2005–NM–213–AD] RIN 2120–AA64 Airworthiness Directives; Bombardier Model CL–600–2C10 (Regional Jet Series 700, 701, & 702) Airplanes, Model CL–600–2D15 (Regional Jet Series 705) Airplanes, and Model CL– 600–2D24 (Regional Jet Series 900) Airplanes Federal Aviation Administration (FAA), Department of Transportation (DOT). ACTION: Notice of proposed rulemaking (NPRM). AGENCY: SUMMARY: The FAA proposes to supersede an existing airworthiness directive (AD) that applies to certain Bombardier Model CL–600–2C10 (Regional Jet Series 700 & 701) and CL– 600–2D24 (Regional Jet Series 900) series airplanes. The existing AD currently requires repetitive detailed inspections for cracking or deformation, or pulled or missing fasteners, on the lower panel of the left- and right-hand main landing gear (MLG) doors, as applicable, and corrective actions if necessary. This proposed AD would reduce the repetitive inspection interval for certain airplanes. This proposed AD also adds airplanes to the applicability. This proposed AD results from a report of a MLG door departing from an airplane. We are proposing this AD to prevent failure of the lower panel of the MLG door, the lower panel’s departure from the airplane, and consequent damage to airplane structure, which could adversely affect the airplane’s continued safe flight and landing. PO 00000 Frm 00010 Fmt 4702 Sfmt 4702 11335 We must receive comments on this proposed AD by April 6, 2006. ADDRESSES: Use one of the following addresses to submit comments on this proposed AD. • DOT Docket Web site: Go to http://dms.dot.gov and follow the instructions for sending your comments electronically. • Government-wide rulemaking Web site: Go to http://www.regulations.gov and follow the instructions for sending your comments electronically. • Mail: Docket Management Facility; U.S. Department of Transportation, 400 Seventh Street, SW., Nassif Building, Room PL–401, Washington, DC 20590. • Fax: (202) 493–2251. • Hand Delivery: room PL–401 on the plaza level of the Nassif Building, 400 Seventh Street, SW., Washington, DC, between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. Contact Bombardier, Inc., Canadair, Aerospace Group, P.O. Box 6087, Station Centre-ville, Montreal, Quebec H3C 3G9, Canada, for service information identified in this proposed AD. FOR FURTHER INFORMATION CONTACT: Richard Beckwith, Aerospace Engineer, Airframe and Propulsion Branch, ANE– 171, FAA, New York Aircraft Certification Office, 1600 Stewart Avenue, suite 410, Westbury, New York 11590; telephone (516) 228–7302; fax (516) 794–5531. SUPPLEMENTARY INFORMATION: DATES: Comments Invited We invite you to submit any relevant written data, views, or arguments regarding this proposed AD. Send your comments to an address listed in the ADDRESSES section. Include the docket number ‘‘Docket No. FAA–2006–24074; Directorate Identifier 2005–NM–213– AD’’ at the beginning of your comments. We specifically invite comments on the overall regulatory, economic, environmental, and energy aspects of the proposed AD. We will consider all comments received by the closing date and may amend the proposed AD in light of those comments. We will post all comments we receive, without change, to http:// dms.dot.gov, including any personal information you provide. We will also post a report summarizing each substantive verbal contact with FAA personnel concerning this proposed AD. Using the search function of that Web site, anyone can find and read the comments in any of our dockets, including the name of the individual who sent the comment (or signed the comment on behalf of an association, E:\FR\FM\07MRP1.SGM 07MRP1 11336 Federal Register / Vol. 71, No. 44 / Tuesday, March 7, 2006 / Proposed Rules business, labor union, etc.). You may review the DOT’s complete Privacy Act Statement in the Federal Register published on April 11, 2000 (65 FR 19477–78), or you may visit http:// dms.dot.gov. Examining the Docket You may examine the AD docket on the Internet at http://dms.dot.gov, or in person at the Docket Management Facility office between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. The Docket Management Facility office (telephone (800) 647–5227) is located on the plaza level of the Nassif Building at the DOT street address stated in the ADDRESSES section. Comments will be available in the AD docket shortly after the Docket Management System receives them. sroberts on PROD1PC70 with PROPOSALS Discussion On October 23, 2003, we issued AD 2003–19–51, amendment 39–13353 (68 FR 61615, October 29, 2003), for certain Bombardier Model CL–600–2C10 (Regional Jet Series 700 & 701) and CL– 600–2D24 (Regional Jet Series 900) series airplanes (originally issued September 17, 2003, as an emergency airworthiness directive). That AD requires repetitive detailed inspections for cracking or deformation, or pulled or missing fasteners, on the lower panel of the left- and right-hand main landing gear (MLG) doors, as applicable, and corrective actions if necessary. That AD resulted from a report of a lower panel of the door of the right-hand MLG of a Model CL–600–2C10 series airplane departing the airplane during landing. We issued that AD to prevent failure of the lower panel of the MLG door, the lower panel’s departure from the airplane, and consequent damage to airplane structure, which could adversely affect the airplane’s continued safe flight and landing. Actions Since Existing AD Was Issued Since we issued AD 2003–19–51, Transport Canada Civil Aviation (TCCA), which is the airworthiness authority for Canada, notified us that an inboard MLG door departed from an airplane affected by the existing AD. The airplane was operating under an alternative means of compliance (AMOC) to the TCCA airworthiness directive that allowed extension of the repetitive interval when certain repairs or modifications where done. The TCCA determined that the inspection intervals should be reduced for those airplanes. The TCCA also determined that inspections are needed for additional airplanes affected by the identified unsafe condition. VerDate Aug<31>2005 16:19 Mar 06, 2006 Jkt 208001 Relevant Service Information Bombardier has issued Alert Service Bulletin A670BA–32–016, Revision A, dated June 7, 2005, including Appendices A and B, dated June 2, 2005. The service bulletin describes procedures for doing repetitive inspections of the left- and right-hand inboard MLG doors for damage, and corrective actions if necessary. The inspections include doing a general visual inspection of the skin for damage such as loose, pulled, or missing fasteners, missing paint, or scratches around the rivet heads; and a detailed inspection of the inboard MLG door for cracking or deformation. The corrective actions include replacing the MLG door with a new or repaired MLG door. Accomplishing the actions specified in the service information is intended to adequately address the unsafe condition. TCCA mandated the service information and issued Canadian airworthiness directive CF–2003–23R2, dated July 27, 2005, to ensure the continued airworthiness of these airplanes in Canada. FAA’s Determination and Requirements of the Proposed AD These airplane models are manufactured in Canada and are type certificated for operation in the United States under the provisions of section 21.29 of the Federal Aviation Regulations (14 CFR 21.29) and the applicable bilateral airworthiness agreement. Pursuant to this bilateral airworthiness agreement, TCCA has kept the FAA informed of the situation described above. We have examined TCCA’s findings, evaluated all pertinent information, and determined that AD action is necessary for airplanes of this type design that are certificated for operation in the United States. This proposed AD would supersede AD 2003–19–51. This proposed AD would retain certain requirements of AD 2003–19–51 and would require accomplishing the actions specified in the service bulletin described previously, except as discussed under ‘‘Differences Between the Proposed AD and the Service Bulletin/Canadian Airworthiness Directive.’’ Differences Among the Proposed AD and the Service Bulletin/Canadian Airworthiness Directive Although Bombardier Alert Service Bulletin A670BA–32–016, Revision A, dated June 7, 2005, and the Canadian airworthiness directive specify to submit certain information to the manufacturer, this proposed AD does not include that requirement. PO 00000 Frm 00011 Fmt 4702 Sfmt 4702 Bombardier Alert Service Bulletin A670BA–32–016, Revision A, dated June 7, 2005, includes a note in the Accomplishment Instructions to inform operators to contact Bombardier if no accurate generic repair engineering order is available when accomplishing the repair. However, this proposed AD would require doing the repair using a method that we or TCCA (or its delegated agent) approve. In light of the type of repair that would be required to address the unsafe condition, and consistent with existing bilateral airworthiness agreements, we have determined that, for this proposed AD, a repair we or TCCA (or its delegated agent) approve would be acceptable for compliance with this proposed AD. The Canadian airworthiness directive references the limitations specified in the configuration deviation list (CDL) for airplanes that remove damaged inboard MLG doors. The information in the CDL has been revised since we issued AD 2003–19–51. For airplanes on which the door(s) have been removed in accordance with AD 2003–19–51, we would require revising the CDL to the latest revision. Change to Existing AD This proposed AD would retain certain requirements of AD 2003–19–51. Since AD 2003–19–51 was issued, the AD format has been revised, and certain paragraphs have been rearranged. As a result, the corresponding paragraph identifiers have changed in this proposed AD, as listed in the following table: REVISED PARAGRAPH IDENTIFIERS Requirement in AD 2003–19–51 paragraph paragraph paragraph paragraph (a) (b) (c) (d) ............ ............ ............ ............ Corresponding requirement in this proposed AD paragraph paragraph paragraph paragraph (f). (g). (h). (i). Clarification of Alternative Method of Compliance (AMOC) Paragraph We have revised this action to clarify the appropriate procedure for notifying the principal inspector before using any approved AMOC on any airplane to which the AMOC applies. Explanation of Change to Applicability We have revised the applicability of the existing AD to identify model designations as published in the most recent type certificate data sheet for the affected models. E:\FR\FM\07MRP1.SGM 07MRP1 Federal Register / Vol. 71, No. 44 / Tuesday, March 7, 2006 / Proposed Rules Interim Action identified, we may consider further rulemaking then. We consider this proposed AD interim action. If final action is later 11337 Costs of Compliance The following table provides the estimated costs for U.S. operators to comply with this proposed AD. ESTIMATED COSTS Work hours Action Average labor rate per hour Number of U.S.-registered airplanes Cost per airplane Inspections (required by AD 2003–19– 51). Inspections (new proposed action) ...... 1 $65 $65, per inspection cycle .................... 83 1 65 $65, per inspection cycle .................... 213 Revision (new proposed action) .......... 1 65 $65, if necessary ................................. 213 sroberts on PROD1PC70 with PROPOSALS Authority for This Rulemaking Title 49 of the United States Code specifies the FAA’s authority to issue rules on aviation safety. Subtitle I, Section 106, describes the authority of the FAA Administrator. Subtitle VII, Aviation Programs, describes in more detail the scope of the Agency’s authority. We are issuing this rulemaking under the authority described in Subtitle VII, Part A, Subpart III, Section 44701, ‘‘General requirements.’’ Under that section, Congress charges the FAA with promoting safe flight of civil aircraft in air commerce by prescribing regulations for practices, methods, and procedures the Administrator finds necessary for safety in air commerce. This regulation is within the scope of that authority because it addresses an unsafe condition that is likely to exist or develop on products identified in this rulemaking action. Regulatory Findings We have determined that this proposed AD would not have federalism implications under Executive Order 13132. This proposed AD would not have a substantial direct effect on the States, on the relationship between the National Government and the States, or on the distribution of power and responsibilities among the various levels of government. For the reasons discussed above, I certify that the proposed regulation: 1. Is not a ‘‘significant regulatory action’’ under Executive Order 12866; 2. Is not a ‘‘significant rule’’ under the DOT Regulatory Policies and Procedures (44 FR 11034, February 26, 1979); and 3. Will not have a significant economic impact, positive or negative, on a substantial number of small entities under the criteria of the Regulatory Flexibility Act. We prepared a regulatory evaluation of the estimated costs to comply with this proposed AD and placed it in the VerDate Aug<31>2005 16:19 Mar 06, 2006 Jkt 208001 Fleet cost $5,395, per inspection cycle. $13,854, per inspection cycle. Up to $13,854. AD docket. See the ADDRESSES section for a location to examine the regulatory evaluation. airplane, and consequent damage to airplane structure, which could adversely affect the airplane’s continued safe flight and landing. List of Subjects in 14 CFR Part 39 Air transportation, Aircraft, Aviation safety, Safety. Compliance (e) You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done. The Proposed Amendment Accordingly, under the authority delegated to me by the Administrator, the FAA proposes to amend 14 CFR part 39 as follows: PART 39—AIRWORTHINESS DIRECTIVES 1. The authority citation for part 39 continues to read as follows: Authority: 49 U.S.C. 106(g), 40113, 44701. § 39.13 [Amended] 2. The Federal Aviation Administration (FAA) amends § 39.13 by removing amendment 39–13353 (68 FR 61615, October 29, 2003) and adding the following new airworthiness directive (AD): Bombardier, Inc. (Formerly Canadair): Docket No. FAA–2006–24074; Directorate Identifier 2005–NM–213–AD. Comments Due Date (a) The FAA must receive comments on this AD action by April 6, 2006. Affected ADs (b) This AD supersedes AD 2003–19–51. Applicability (c) This AD applies to Bombardier Model CL–600–2C10 (Regional Jet Series 700, 701, & 702) airplanes, serial numbers (S/Ns) 10003 and subsequent; and Model CL–600–2D15 (Regional Jet Series 705) airplanes, and Model CL–600–2D24 (Regional Jet Series 900) airplanes, S/Ns 15001 and subsequent; certificated in any category. Unsafe Condition (d) This AD results from a report of a main landing gear (MLG) door departing from an airplane. We are issuing this AD to prevent failure of the lower panel of the MLG door, the lower panel’s departure from the PO 00000 Frm 00012 Fmt 4702 Sfmt 4702 Restatement of Requirements of AD 2003– 19–51 Initial Compliance Time (f) For Model CL–600–2C10 (Regional Jet series 700 & 701) series airplanes, S/Ns 10003 through 10999 inclusive; and Model CL–600– 2D24 (Regional Jet series 900) series airplanes, S/Ns 15002 through 15990 inclusive: Perform the initial inspection specified in paragraph (g) of this AD at the applicable time specified in paragraph (f)(1) or (f)(2) of this AD. (1) For airplanes with fewer than 1,500 total flight cycles as of November 3, 2003, (the effective date of AD 2003–19–51): Do the inspections before the accumulation of 1,050 total flight cycles, or within 50 flight cycles after the effective date of this AD, whichever is later. (2) For airplanes with 1,500 or more total flight cycles as of November 3, 2003: Do the inspections within 10 flight cycles after the effective date of this AD. Inspections (g) For Model CL–600–2C10 (Regional Jet series 700 & 701) series airplanes, S/Ns 10003 through 10999 inclusive; and Model CL–600– 2D24 (Regional Jet series 900) series airplanes, S/Ns 15002 through 15990 inclusive: At the applicable time specified in paragraph (f) of this AD, perform detailed inspections of the lower panel, part number (P/N) CC670–10520, of the left- and righthand MLG doors for the conditions and in the areas specified in paragraphs (g)(1), (g)(2), (g)(3), and (g)(4) of this AD; and Figures 1, 2, and 3 of this AD. Note 1: For the purposes of this AD, a detailed inspection is defined as: ‘‘An intensive visual examination of a specific structural area, system, installation, or assembly to detect damage, failure, or irregularity. Available lighting is normally supplemented with a direct source of good lighting at intensity deemed appropriate by the inspector. Inspection aids such as mirror, E:\FR\FM\07MRP1.SGM 07MRP1 Federal Register / Vol. 71, No. 44 / Tuesday, March 7, 2006 / Proposed Rules magnifying lenses, etc., may be used. Surface cleaning and elaborate access procedures may be required.’’ sroberts on PROD1PC70 with PROPOSALS (1) Inspect the cross member, P/N CC670– 10572, of the MLG door lower panel for cracking or deformation, in accordance with Figure 2 of this AD. (2) Inspect the inner skin, P/N CC670– 10577, of the MLG door lower panel at the VerDate Aug<31>2005 16:19 Mar 06, 2006 Jkt 208001 cross member (P/N CC670–10572) for cracking or deformation, or pulled or missing fasteners, in accordance with Figure 2 of this AD. (3) Inspect the outer skin, P/N CC670– 10574, of the MLG door lower panel at the cross member (P/N CC670–10572) for cracking or deformation, or pulled or missing PO 00000 fasteners, in accordance with Figure 2 of this AD. (4) Inspect the forward member, P/N CC670–10570, and aft member, P/N CC670– 10571, of the MLG door lower panel, for cracking or deformation, or pulled or missing fasteners, in accordance with Figure 3 of this AD. Figures 1 through 3 of this AD follow. BILLING CODE 4910–13–P Frm 00013 Fmt 4702 Sfmt 4725 E:\FR\FM\07MRP1.SGM 07MRP1 EP07MR06.000</GPH> 11338 thereafter at intervals not to exceed 100 flight cycles. Repetitive Inspections (h) If no cracking or deformation, or pulled or missing fastener, as applicable, is found during any inspection required by paragraph (g) or (h) of this AD, repeat the inspections VerDate Aug<31>2005 16:19 Mar 06, 2006 Jkt 208001 Corrective Actions (i) If any cracking or deformation, or pulled or missing fastener, as applicable, is found during any inspection done in accordance with paragraph (g) or (h) of this AD: Before PO 00000 Frm 00014 Fmt 4702 Sfmt 4702 further flight, accomplish paragraph (i)(1), (i)(2), or (i)(3) of this AD. (1) Repair the damage in accordance with a method approved by either the Manager, New York Aircraft Certification Office (ACO), FAA; or Transport Canada Civil Aviation (or its delegated agent); and accomplish repetitive inspections in accordance with a E:\FR\FM\07MRP1.SGM 07MRP1 EP07MR06.002</GPH> BILLING CODE 4910–13–C 11339 EP07MR06.001</GPH> sroberts on PROD1PC70 with PROPOSALS Federal Register / Vol. 71, No. 44 / Tuesday, March 7, 2006 / Proposed Rules 11340 Federal Register / Vol. 71, No. 44 / Tuesday, March 7, 2006 / Proposed Rules method and at a repetitive interval approved by same. (2) Replace the lower panel assembly, P/N CC670–10520, of the affected MLG door with a new or serviceable lower panel assembly having the same P/N, in accordance with Task Cards 32–12–01–000–801–A01 and 32– 12–01–400–801–A01 of the CRJ 700/900 Series Regional Jet Aircraft Maintenance Manual; and repeat the inspections specified in paragraph (g) of this AD at intervals not to exceed 100 flight cycles. (3) Remove the lower panel assembly, P/N CC670–10520, of the affected MLG door, and accomplish paragraph (i)(3)(i) or (i)(3)(ii), as applicable. (i) For Model CL600–2C10 (Regional Jet series 700 & 701) series airplanes: Revise the Configuration Deviation List (CDL), Appendix 1, of the airplane flight manual (AFM), to include the following limitations. This may be accomplished by inserting a copy of this AD into the CDL of the AFM. ‘‘For Model CL600–2C10 series airplanes: If one or both door panel assemblies, part number CC670–10520, is missing: (1) Take-off Weight is reduced by 202.5 kg/ door, or 450 lb/door (2) Enroute Climb Weight is reduced by 445.5 kg/door, or 990 lb/door (3) Landing Weight is reduced by 202.5 kg/ door, or 450 lb/door (4) Fuel Consumption is increased by +3.42% on fuel used/door (5) Cruise Airspeed is limited to not more than 0.78 Mach.’’ (ii) For Model CL–600–2D24 (Regional Jet series 900) series airplanes: Revise the CDL, Appendix 1, of the AFM, to include the following limitations. This may be accomplished by inserting a copy of this AD into the CDL of the AFM. ‘‘For Model CL600–2D24 series airplanes: If one or both door panel assemblies, part number CC670–10520, is missing: (1) Take-off Weight is reduced by 245 kg/ door, or 540 lb/door (2) Enroute Climb Weight is reduced by 551 kg/door, or 1,215 lb/door (3) Landing Weight is reduced by 245 kg/ door, or 540 lb/door (4) Fuel Consumption is increased by +3.42% on fuel used/door (5)Cruise Airspeed is limited to not more than 0.78 Mach.’’ sroberts on PROD1PC70 with PROPOSALS New Requirements of This AD Inboard MLG Door Inspections (j) For all airplanes on which an inspection has not been done in accordance with paragraph (g) of this AD on or before the effective date of this AD: At the applicable time specified in paragraph (j)(1) or (j)(2) of this AD, do the inspections of the left- and right-hand inboard MLG doors for damage in accordance with Part A of the Accomplishment Instructions of the Bombardier Alert Service Bulletin A670BA– 32–016, Revision A, dated June 7, 2005, including Appendix B, dated June 2, 2005, excluding Appendix A, dated June 2, 2005. Doing the inspections required by this paragraph terminates the actions required by paragraphs (f) through (i) of this AD. (1) For airplanes that have accumulated fewer than 1,500 total flight cycles as of the VerDate Aug<31>2005 16:19 Mar 06, 2006 Jkt 208001 effective date of this AD: Before the accumulation of 1,000 total flight cycles or within 50 flight cycles after the effective date of this AD, whichever occurs later. (2) For airplanes that have accumulated 1,500 flight cycles or more as of the effective date of this AD: Within 10 flight cycles after the effective date of this AD. (k) For all airplanes on which an inspection has been done in accordance with paragraph (g) of this AD on or before the effective date of this AD and on which both doors have not been removed in accordance with paragraph (i)(3) of this AD: At the applicable time specified in paragraph (k)(1) or (k)(2) of this AD, do the inspections specified in paragraph (j) of this AD; except for airplanes on which one door has been removed in accordance with paragraph (i)(3) of this AD, do the inspections specified in paragraph (j) of this AD for the door that has not been removed. Doing the inspections required by this paragraph terminates the actions required by paragraphs (f) through (i) of this AD. (1) For airplanes that are not subject to an approved alternative method of compliance (AMOC) that extends the inspection interval to 450 flight cycles: Within 100 flight cycles since the last inspection done in accordance with paragraph (g) of this AD. (2) For airplanes that are subject to an approved AMOC that extends the inspection interval to 450 flight cycles: At the earlier of the times specified in paragraph (k)(2)(i) and (k)(2)(ii) of this AD: (i) Within 450 flight cycles since the last inspection done in accordance with paragraph (g) of this AD. (ii) Within 100 flight cycles since the last inspection done in accordance with paragraph (g) of this AD or within 50 cycles after the effective date of this AD, whichever occurs later. (l) If no damage is found during any inspection done in accordance with paragraph (j) of this AD, repeat the inspections specified in paragraph (j) of this AD thereafter at intervals not to exceed 100 flight cycles. Corrective Action—Replace or Remove MLG Door (m) If any damage is found during any inspection done in accordance with paragraph (j) of this AD, before further flight, do the actions in paragraph (m)(1) or (m)(2) of this AD. Repeat the inspections specified in paragraph (j) of this AD thereafter at intervals not to exceed 100 flight cycles. (1) Replace the inboard MLG door with a new or repaired door in accordance with Part B of the Accomplishment Instructions of the Bombardier Alert Service Bulletin A670BA– 32–016, Revision A, dated June 7, 2005, including Appendix B, dated June 2, 2005, excluding Appendix A, dated June 2, 2005; except where the service bulletin specifies to contact the manufacturer for repair if no generic repair engineering order (REO) is available, before further flight, repair using a method approved by either the Manager, New York Aircraft Certification Office (ACO), FAA; or the Transport Canada Civil Aviation (TCCA) (or its delegated agent). (2) Remove the inboard MLG door in accordance with Part B of the PO 00000 Frm 00015 Fmt 4702 Sfmt 4702 Accomplishment Instructions of the Bombardier Alert Service Bulletin A670BA– 32–016, Revision A, dated June 7, 2005, including Appendix B, dated June 2, 2005, excluding Appendix A, dated June 2, 2005; and accomplish paragraph (m)(2)(i) or (m)(2)(ii), as applicable. (i) For Model CL–600–2C10 (Regional Jet Series 700, 701, & 702) airplanes and Model CL–600–2D15 (Regional Jet Series 705) airplanes: Revise the Configuration Deviation List (CDL), Appendix 1, of the airplane flight manual (AFM), to include the following limitations. This may be accomplished by inserting a copy of this AD into the CDL of the AFM. Remove any existing CDL limitation required by paragraph (i)(3)(i) of this AD from the AFM. ‘‘For Model CL–600–2C10 (Regional Jet Series 700, 701, & 702) airplanes and Model CL–600–2D15 (Regional Jet Series 705) airplanes: If one or both door panel assemblies, part number CC670–10520, is missing: (1) Take-off Weight is reduced by 202.5 kg/ door, or 450 lb/door (2) Enroute Climb Weight is reduced by 445.5 kg/door, or 990 lb/door (3) Landing Weight is reduced by 202.5 kg/ door, or 450 lb/door (4) Fuel Consumption is increased by +2.5% on fuel used/door (5) Cruise Airspeed is limited to not more than 0.78 Mach (6) The climb ceiling obtained from the Flight Planning and Cruise Control Manual (FPCCM) must be reduced by 1,000 ft/door.’’ Note 2: When a statement with the information specified in paragraph (m)(2)(i) of this AD has been included in the general revisions of the AFM, the general revisions may be inserted into the AFM, and the copy of this AD may be removed from the AFM. (ii) For Model CL–600–2D24 (Regional Jet Series 900) airplanes: Revise the CDL, Appendix 1, of the AFM, to include the following limitations. This may be accomplished by inserting a copy of this AD into the CDL of the AFM. Remove any existing CDL limitation required by paragraph (i)(3)(ii) of this AD from the AFM. ‘‘For Model CL–600–2D24 (Regional Jet Series 900) airplanes: If one or both door panel assemblies, part number CC670–10520, is missing: (1) Take-off Weight is reduced by 245 kg/ door, or 540 lb/door (2) Enroute Climb Weight is reduced by 551 kg/door, or 1,215 lb/door (3) Landing Weight is reduced by 245 kg/ door, or 540 lb/door (4) Fuel Consumption is increased by +2.5% on fuel used/door (5)Cruise Airspeed is limited to not more than 0.78 Mach (6)The climb ceiling obtained from the Flight Planning and Cruise Control Manual (FPCCM) must be reduced by 1,000 ft/door.’’ Note 3: When a statement with the information specified in paragraph (m)(2)(ii) of this AD has been included in the general revisions of the AFM, the general revisions may be inserted into the AFM, and the copy of this AD may be removed from the AFM. E:\FR\FM\07MRP1.SGM 07MRP1 Federal Register / Vol. 71, No. 44 / Tuesday, March 7, 2006 / Proposed Rules Revise CDL (n) For airplanes on which the door(s) have been removed in accordance with paragraph (i)(3) of this AD: Within 30 days after the effective date of this AD, do the revision specified in paragraph (m)(2)(i) or (m)(2)(ii) of this AD, as applicable, and remove any revision required by paragraph (i)(3)(i) or (i)(3)(ii) of this AD. Notice of proposed rulemaking (NPRM). ACTION: [Docket No. FAA–2006–24072; Directorate Identifier 2006–NM–016–AD] SUMMARY: The FAA proposes to adopt a new airworthiness directive (AD) for all Empresa Brasileira de Aeronautica S.A. (EMBRAER) EMB–120( ) airplane models in operation. This proposed AD would require replacing the de-icing system ejector flow control valves with new, improved control valves having hermetically sealed switches; and rewiring applicable connectors. This proposed AD results from a fuel system review conducted by the manufacturer. We are proposing this AD to prevent a potential source of ignition near a fuel tank, which, in combination with flammable fuel vapors, could result in a fuel tank explosion and consequent loss of the airplane. DATES: We must receive comments on this proposed AD by April 6, 2006. ADDRESSES: Use one of the following addresses to submit comments on this proposed AD. • DOT Docket Web site: Go to http://dms.dot.gov and follow the instructions for sending your comments electronically. • Government-wide rulemaking Web site: Go to http://www.regulations.gov and follow the instructions for sending your comments electronically. • Mail: Docket Management Facility, U.S. Department of Transportation, 400 Seventh Street, SW., Nassif Building, room PL–401, Washington, DC 20590. • Fax: (202) 493–2251. • Hand Delivery: Room PL–401 on the plaza level of the Nassif Building, 400 Seventh Street, SW., Washington, DC, between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. Contact Empresa Brasileira de Aeronautica S.A. (EMBRAER), P.O. Box 343—CEP 12.225, Sao Jose dos Campos—SP, Brazil, for service information identified in this proposed AD. FOR FURTHER INFORMATION CONTACT: Dan Rodina, Aerospace Engineer, International Branch, ANM–116, FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington 98055–4056; telephone (425) 227–2125; fax (425) 227–1149. SUPPLEMENTARY INFORMATION: RIN 2120–AA64 Comments Invited No Reporting Required (o) Although Bombardier Alert Service Bulletin A670BA–32–016, Revision A, dated June 7, 2005, specifies to submit certain information to the manufacturer, this AD does not include that requirement. Actions Accomplished According to Previous Issue of Service Bulletin (p) Actions accomplished before the effective date of this AD according to Bombardier Alert Service Bulletin A670BA– 32–016, dated June 2, 2005, are considered acceptable for compliance with the corresponding action specified in this AD. Alternative Methods of Compliance (AMOCs) (q)(1) The Manager, New York Aircraft Certification Office (ACO), FAA, has the authority to approve AMOCs for this AD, if requested in accordance with the procedures found in 14 CFR 39.19. (2) Before using any AMOC approved in accordance with § 39.19 on any airplane to which the AMOC applies, notify the appropriate principal inspector in the FAA Flight Standards Certificate Holding District Office. (3) AMOCs approved previously in accordance with AD 2003–19–51 are not approved as AMOCs with this AD. Related Information (r) Canadian airworthiness directive CF– 2003–23R2, dated July 27, 2005, also addresses the subject of this AD. Issued in Renton, Washington, on February 22, 2006. Michael J. Kaszycki, Acting Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. 06–2159 Filed 3–6–06; 8:45 am] BILLING CODE 4910–13–P DEPARTMENT OF TRANSPORTATION Federal Aviation Administration sroberts on PROD1PC70 with PROPOSALS 14 CFR Part 39 Airworthiness Directives; Empresa Brasileira de Aeronautica S.A. (EMBRAER) EMB–120( ) Airplane Models in Operation Federal Aviation Administration (FAA), Department of Transportation (DOT). AGENCY: VerDate Aug<31>2005 16:19 Mar 06, 2006 Jkt 208001 We invite you to submit any relevant written data, views, or arguments regarding this proposed AD. Send your comments to an address listed in the ADDRESSES section. Include the docket number ‘‘FAA–2006–24072; Directorate Identifier 2006–NM–016–AD’’ at the beginning of your comments. We PO 00000 Frm 00016 Fmt 4702 Sfmt 4702 11341 specifically invite comments on the overall regulatory, economic, environmental, and energy aspects of the proposed AD. We will consider all comments received by the closing date and may amend the proposed AD in light of those comments. We will post all comments we receive, without change, to http:// dms.dot.gov, including any personal information you provide. We will also post a report summarizing each substantive verbal contact with FAA personnel concerning this proposed AD. Using the search function of that Web site, anyone can find and read the comments in any of our dockets, including the name of the individual who sent the comment (or signed the comment on behalf of an association, business, labor union, etc.). You may review the DOT’s complete Privacy Act Statement in the Federal Register published on April 11, 2000 (65 FR 19477–78), or you may visit http:// dms.dot.gov. Examining the Docket You may examine the AD docket on the Internet at http://dms.dot.gov, or in person at the Docket Management Facility office between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. The Docket Management Facility office (telephone (800) 647–5227) is located on the plaza level of the Nassif Building at the DOT street address stated in the ADDRESSES section. Comments will be available in the AD docket shortly after the Docket Management System receives them. Discussion The FAA has examined the underlying safety issues involved in fuel tank explosions on several large transport airplanes, including the adequacy of existing regulations, the service history of airplanes subject to those regulations, and existing maintenance practices for fuel tank systems. As a result of those findings, we issued a regulation titled ‘‘Transport Airplane Fuel Tank System Design Review, Flammability Reduction and Maintenance and Inspection Requirements’’ (67 FR 23086, May 7, 2001). In addition to new airworthiness standards for transport airplanes and new maintenance requirements, this rule included Special Federal Aviation Regulation No. 88 (‘‘SFAR 88,’’ Amendment 21–78, and subsequent Amendments 21–82 and 21–83). Among other actions, SFAR 88 requires certain type design (i.e., type certificate (TC) and supplemental type certificate (STC)) holders to substantiate that their fuel tank systems can prevent E:\FR\FM\07MRP1.SGM 07MRP1

Agencies

[Federal Register Volume 71, Number 44 (Tuesday, March 7, 2006)]
[Proposed Rules]
[Pages 11335-11341]
From the Federal Register Online via the Government Printing Office [www.gpo.gov]
[FR Doc No: 06-2159]


-----------------------------------------------------------------------

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2006-24074; Directorate Identifier 2005-NM-213-AD]
RIN 2120-AA64


Airworthiness Directives; Bombardier Model CL-600-2C10 (Regional 
Jet Series 700, 701, & 702) Airplanes, Model CL-600-2D15 (Regional Jet 
Series 705) Airplanes, and Model CL-600-2D24 (Regional Jet Series 900) 
Airplanes

AGENCY: Federal Aviation Administration (FAA), Department of 
Transportation (DOT).

ACTION: Notice of proposed rulemaking (NPRM).

-----------------------------------------------------------------------

SUMMARY: The FAA proposes to supersede an existing airworthiness 
directive (AD) that applies to certain Bombardier Model CL-600-2C10 
(Regional Jet Series 700 & 701) and CL-600-2D24 (Regional Jet Series 
900) series airplanes. The existing AD currently requires repetitive 
detailed inspections for cracking or deformation, or pulled or missing 
fasteners, on the lower panel of the left- and right-hand main landing 
gear (MLG) doors, as applicable, and corrective actions if necessary. 
This proposed AD would reduce the repetitive inspection interval for 
certain airplanes. This proposed AD also adds airplanes to the 
applicability. This proposed AD results from a report of a MLG door 
departing from an airplane. We are proposing this AD to prevent failure 
of the lower panel of the MLG door, the lower panel's departure from 
the airplane, and consequent damage to airplane structure, which could 
adversely affect the airplane's continued safe flight and landing.

DATES: We must receive comments on this proposed AD by April 6, 2006.

ADDRESSES: Use one of the following addresses to submit comments on 
this proposed AD.
     DOT Docket Web site: Go to http://dms.dot.gov and follow 
the instructions for sending your comments electronically.
     Government-wide rulemaking Web site: Go to http://
www.regulations.gov and follow the instructions for sending your 
comments electronically.
     Mail: Docket Management Facility; U.S. Department of 
Transportation, 400 Seventh Street, SW., Nassif Building, Room PL-401, 
Washington, DC 20590.
     Fax: (202) 493-2251.
     Hand Delivery: room PL-401 on the plaza level of the 
Nassif Building, 400 Seventh Street, SW., Washington, DC, between 9 
a.m. and 5 p.m., Monday through Friday, except Federal holidays.
    Contact Bombardier, Inc., Canadair, Aerospace Group, P.O. Box 6087, 
Station Centre-ville, Montreal, Quebec H3C 3G9, Canada, for service 
information identified in this proposed AD.

FOR FURTHER INFORMATION CONTACT: Richard Beckwith, Aerospace Engineer, 
Airframe and Propulsion Branch, ANE-171, FAA, New York Aircraft 
Certification Office, 1600 Stewart Avenue, suite 410, Westbury, New 
York 11590; telephone (516) 228-7302; fax (516) 794-5531.

SUPPLEMENTARY INFORMATION:

Comments Invited

    We invite you to submit any relevant written data, views, or 
arguments regarding this proposed AD. Send your comments to an address 
listed in the ADDRESSES section. Include the docket number ``Docket No. 
FAA-2006-24074; Directorate Identifier 2005-NM-213-AD'' at the 
beginning of your comments. We specifically invite comments on the 
overall regulatory, economic, environmental, and energy aspects of the 
proposed AD. We will consider all comments received by the closing date 
and may amend the proposed AD in light of those comments.
    We will post all comments we receive, without change, to http://
dms.dot.gov, including any personal information you provide. We will 
also post a report summarizing each substantive verbal contact with FAA 
personnel concerning this proposed AD. Using the search function of 
that Web site, anyone can find and read the comments in any of our 
dockets, including the name of the individual who sent the comment (or 
signed the comment on behalf of an association,

[[Page 11336]]

business, labor union, etc.). You may review the DOT's complete Privacy 
Act Statement in the Federal Register published on April 11, 2000 (65 
FR 19477-78), or you may visit http://dms.dot.gov.

Examining the Docket

    You may examine the AD docket on the Internet at http://
dms.dot.gov, or in person at the Docket Management Facility office 
between 9 a.m. and 5 p.m., Monday through Friday, except Federal 
holidays. The Docket Management Facility office (telephone (800) 647-
5227) is located on the plaza level of the Nassif Building at the DOT 
street address stated in the ADDRESSES section. Comments will be 
available in the AD docket shortly after the Docket Management System 
receives them.

Discussion

    On October 23, 2003, we issued AD 2003-19-51, amendment 39-13353 
(68 FR 61615, October 29, 2003), for certain Bombardier Model CL-600-
2C10 (Regional Jet Series 700 & 701) and CL-600-2D24 (Regional Jet 
Series 900) series airplanes (originally issued September 17, 2003, as 
an emergency airworthiness directive). That AD requires repetitive 
detailed inspections for cracking or deformation, or pulled or missing 
fasteners, on the lower panel of the left- and right-hand main landing 
gear (MLG) doors, as applicable, and corrective actions if necessary. 
That AD resulted from a report of a lower panel of the door of the 
right-hand MLG of a Model CL-600-2C10 series airplane departing the 
airplane during landing. We issued that AD to prevent failure of the 
lower panel of the MLG door, the lower panel's departure from the 
airplane, and consequent damage to airplane structure, which could 
adversely affect the airplane's continued safe flight and landing.

Actions Since Existing AD Was Issued

    Since we issued AD 2003-19-51, Transport Canada Civil Aviation 
(TCCA), which is the airworthiness authority for Canada, notified us 
that an inboard MLG door departed from an airplane affected by the 
existing AD. The airplane was operating under an alternative means of 
compliance (AMOC) to the TCCA airworthiness directive that allowed 
extension of the repetitive interval when certain repairs or 
modifications where done. The TCCA determined that the inspection 
intervals should be reduced for those airplanes. The TCCA also 
determined that inspections are needed for additional airplanes 
affected by the identified unsafe condition.

Relevant Service Information

    Bombardier has issued Alert Service Bulletin A670BA-32-016, 
Revision A, dated June 7, 2005, including Appendices A and B, dated 
June 2, 2005. The service bulletin describes procedures for doing 
repetitive inspections of the left- and right-hand inboard MLG doors 
for damage, and corrective actions if necessary. The inspections 
include doing a general visual inspection of the skin for damage such 
as loose, pulled, or missing fasteners, missing paint, or scratches 
around the rivet heads; and a detailed inspection of the inboard MLG 
door for cracking or deformation. The corrective actions include 
replacing the MLG door with a new or repaired MLG door. Accomplishing 
the actions specified in the service information is intended to 
adequately address the unsafe condition. TCCA mandated the service 
information and issued Canadian airworthiness directive CF-2003-23R2, 
dated July 27, 2005, to ensure the continued airworthiness of these 
airplanes in Canada.

FAA's Determination and Requirements of the Proposed AD

    These airplane models are manufactured in Canada and are type 
certificated for operation in the United States under the provisions of 
section 21.29 of the Federal Aviation Regulations (14 CFR 21.29) and 
the applicable bilateral airworthiness agreement. Pursuant to this 
bilateral airworthiness agreement, TCCA has kept the FAA informed of 
the situation described above. We have examined TCCA's findings, 
evaluated all pertinent information, and determined that AD action is 
necessary for airplanes of this type design that are certificated for 
operation in the United States.
    This proposed AD would supersede AD 2003-19-51. This proposed AD 
would retain certain requirements of AD 2003-19-51 and would require 
accomplishing the actions specified in the service bulletin described 
previously, except as discussed under ``Differences Between the 
Proposed AD and the Service Bulletin/Canadian Airworthiness 
Directive.''

Differences Among the Proposed AD and the Service Bulletin/Canadian 
Airworthiness Directive

    Although Bombardier Alert Service Bulletin A670BA-32-016, Revision 
A, dated June 7, 2005, and the Canadian airworthiness directive specify 
to submit certain information to the manufacturer, this proposed AD 
does not include that requirement.
    Bombardier Alert Service Bulletin A670BA-32-016, Revision A, dated 
June 7, 2005, includes a note in the Accomplishment Instructions to 
inform operators to contact Bombardier if no accurate generic repair 
engineering order is available when accomplishing the repair. However, 
this proposed AD would require doing the repair using a method that we 
or TCCA (or its delegated agent) approve. In light of the type of 
repair that would be required to address the unsafe condition, and 
consistent with existing bilateral airworthiness agreements, we have 
determined that, for this proposed AD, a repair we or TCCA (or its 
delegated agent) approve would be acceptable for compliance with this 
proposed AD. The Canadian airworthiness directive references the 
limitations specified in the configuration deviation list (CDL) for 
airplanes that remove damaged inboard MLG doors. The information in the 
CDL has been revised since we issued AD 2003-19-51. For airplanes on 
which the door(s) have been removed in accordance with AD 2003-19-51, 
we would require revising the CDL to the latest revision.

Change to Existing AD

    This proposed AD would retain certain requirements of AD 2003-19-
51. Since AD 2003-19-51 was issued, the AD format has been revised, and 
certain paragraphs have been rearranged. As a result, the corresponding 
paragraph identifiers have changed in this proposed AD, as listed in 
the following table:

                      Revised Paragraph Identifiers
------------------------------------------------------------------------
                                             Corresponding  requirement
       Requirement in  AD 2003-19-51            in this  proposed AD
------------------------------------------------------------------------
paragraph (a).............................  paragraph (f).
paragraph (b).............................  paragraph (g).
paragraph (c).............................  paragraph (h).
paragraph (d).............................  paragraph (i).
------------------------------------------------------------------------

Clarification of Alternative Method of Compliance (AMOC) Paragraph

    We have revised this action to clarify the appropriate procedure 
for notifying the principal inspector before using any approved AMOC on 
any airplane to which the AMOC applies.

Explanation of Change to Applicability

    We have revised the applicability of the existing AD to identify 
model designations as published in the most recent type certificate 
data sheet for the affected models.

[[Page 11337]]

Interim Action

    We consider this proposed AD interim action. If final action is 
later identified, we may consider further rulemaking then.

Costs of Compliance

    The following table provides the estimated costs for U.S. operators 
to comply with this proposed AD.

                                                 Estimated Costs
----------------------------------------------------------------------------------------------------------------
                                         Average
                                 Work     labor        Cost per     Number of U.S.-
            Action              hours    rate per      airplane       registered             Fleet cost
                                           hour                        airplanes
----------------------------------------------------------------------------------------------------------------
Inspections (required by AD          1        $65  $65, per                     83  $5,395, per inspection
 2003-19-51).                                       inspection                       cycle.
                                                    cycle.
Inspections (new proposed            1         65  $65, per                    213  $13,854, per inspection
 action).                                           inspection                       cycle.
                                                    cycle.
Revision (new proposed               1         65  $65, if                     213  Up to $13,854.
 action).                                           necessary.
----------------------------------------------------------------------------------------------------------------

Authority for This Rulemaking

    Title 49 of the United States Code specifies the FAA's authority to 
issue rules on aviation safety. Subtitle I, Section 106, describes the 
authority of the FAA Administrator. Subtitle VII, Aviation Programs, 
describes in more detail the scope of the Agency's authority.
    We are issuing this rulemaking under the authority described in 
Subtitle VII, Part A, Subpart III, Section 44701, ``General 
requirements.'' Under that section, Congress charges the FAA with 
promoting safe flight of civil aircraft in air commerce by prescribing 
regulations for practices, methods, and procedures the Administrator 
finds necessary for safety in air commerce. This regulation is within 
the scope of that authority because it addresses an unsafe condition 
that is likely to exist or develop on products identified in this 
rulemaking action.

Regulatory Findings

    We have determined that this proposed AD would not have federalism 
implications under Executive Order 13132. This proposed AD would not 
have a substantial direct effect on the States, on the relationship 
between the National Government and the States, or on the distribution 
of power and responsibilities among the various levels of government.
    For the reasons discussed above, I certify that the proposed 
regulation:
    1. Is not a ``significant regulatory action'' under Executive Order 
12866;
    2. Is not a ``significant rule'' under the DOT Regulatory Policies 
and Procedures (44 FR 11034, February 26, 1979); and
    3. Will not have a significant economic impact, positive or 
negative, on a substantial number of small entities under the criteria 
of the Regulatory Flexibility Act.
    We prepared a regulatory evaluation of the estimated costs to 
comply with this proposed AD and placed it in the AD docket. See the 
ADDRESSES section for a location to examine the regulatory evaluation.

List of Subjects in 14 CFR Part 39

    Air transportation, Aircraft, Aviation safety, Safety.

The Proposed Amendment

    Accordingly, under the authority delegated to me by the 
Administrator, the FAA proposes to amend 14 CFR part 39 as follows:

PART 39--AIRWORTHINESS DIRECTIVES

    1. The authority citation for part 39 continues to read as follows:

    Authority: 49 U.S.C. 106(g), 40113, 44701.


Sec.  39.13  [Amended]

    2. The Federal Aviation Administration (FAA) amends Sec.  39.13 by 
removing amendment 39-13353 (68 FR 61615, October 29, 2003) and adding 
the following new airworthiness directive (AD):

Bombardier, Inc. (Formerly Canadair): Docket No. FAA-2006-24074; 
Directorate Identifier 2005-NM-213-AD.

Comments Due Date

    (a) The FAA must receive comments on this AD action by April 6, 
2006.

Affected ADs

    (b) This AD supersedes AD 2003-19-51.

Applicability

    (c) This AD applies to Bombardier Model CL-600-2C10 (Regional 
Jet Series 700, 701, & 702) airplanes, serial numbers (S/Ns) 10003 
and subsequent; and Model CL-600-2D15 (Regional Jet Series 705) 
airplanes, and Model CL-600-2D24 (Regional Jet Series 900) 
airplanes, S/Ns 15001 and subsequent; certificated in any category.

Unsafe Condition

    (d) This AD results from a report of a main landing gear (MLG) 
door departing from an airplane. We are issuing this AD to prevent 
failure of the lower panel of the MLG door, the lower panel's 
departure from the airplane, and consequent damage to airplane 
structure, which could adversely affect the airplane's continued 
safe flight and landing.

Compliance

    (e) You are responsible for having the actions required by this 
AD performed within the compliance times specified, unless the 
actions have already been done.

Restatement of Requirements of AD 2003-19-51

Initial Compliance Time

    (f) For Model CL-600-2C10 (Regional Jet series 700 & 701) series 
airplanes, S/Ns 10003 through 10999 inclusive; and Model CL-600-2D24 
(Regional Jet series 900) series airplanes, S/Ns 15002 through 15990 
inclusive: Perform the initial inspection specified in paragraph (g) 
of this AD at the applicable time specified in paragraph (f)(1) or 
(f)(2) of this AD.
    (1) For airplanes with fewer than 1,500 total flight cycles as 
of November 3, 2003, (the effective date of AD 2003-19-51): Do the 
inspections before the accumulation of 1,050 total flight cycles, or 
within 50 flight cycles after the effective date of this AD, 
whichever is later.
    (2) For airplanes with 1,500 or more total flight cycles as of 
November 3, 2003: Do the inspections within 10 flight cycles after 
the effective date of this AD.

Inspections

    (g) For Model CL-600-2C10 (Regional Jet series 700 & 701) series 
airplanes, S/Ns 10003 through 10999 inclusive; and Model CL-600-2D24 
(Regional Jet series 900) series airplanes, S/Ns 15002 through 15990 
inclusive: At the applicable time specified in paragraph (f) of this 
AD, perform detailed inspections of the lower panel, part number (P/
N) CC670-10520, of the left- and right-hand MLG doors for the 
conditions and in the areas specified in paragraphs (g)(1), (g)(2), 
(g)(3), and (g)(4) of this AD; and Figures 1, 2, and 3 of this AD.

    Note 1: For the purposes of this AD, a detailed inspection is 
defined as: ``An intensive visual examination of a specific 
structural area, system, installation, or assembly to detect damage, 
failure, or irregularity. Available lighting is normally 
supplemented with a direct source of good lighting at intensity 
deemed appropriate by the inspector. Inspection aids such as mirror,

[[Page 11338]]

magnifying lenses, etc., may be used. Surface cleaning and elaborate 
access procedures may be required.''


    (1) Inspect the cross member, P/N CC670-10572, of the MLG door 
lower panel for cracking or deformation, in accordance with Figure 2 
of this AD.
    (2) Inspect the inner skin, P/N CC670-10577, of the MLG door 
lower panel at the cross member (P/N CC670-10572) for cracking or 
deformation, or pulled or missing fasteners, in accordance with 
Figure 2 of this AD.
    (3) Inspect the outer skin, P/N CC670-10574, of the MLG door 
lower panel at the cross member (P/N CC670-10572) for cracking or 
deformation, or pulled or missing fasteners, in accordance with 
Figure 2 of this AD.
    (4) Inspect the forward member, P/N CC670-10570, and aft member, 
P/N CC670-10571, of the MLG door lower panel, for cracking or 
deformation, or pulled or missing fasteners, in accordance with 
Figure 3 of this AD. Figures 1 through 3 of this AD follow.
BILLING CODE 4910-13-P
[GRAPHIC] [TIFF OMITTED] TP07MR06.000


[[Page 11339]]


[GRAPHIC] [TIFF OMITTED] TP07MR06.001

[GRAPHIC] [TIFF OMITTED] TP07MR06.002

BILLING CODE 4910-13-C

Repetitive Inspections

    (h) If no cracking or deformation, or pulled or missing 
fastener, as applicable, is found during any inspection required by 
paragraph (g) or (h) of this AD, repeat the inspections thereafter 
at intervals not to exceed 100 flight cycles.

Corrective Actions

    (i) If any cracking or deformation, or pulled or missing 
fastener, as applicable, is found during any inspection done in 
accordance with paragraph (g) or (h) of this AD: Before further 
flight, accomplish paragraph (i)(1), (i)(2), or (i)(3) of this AD.
    (1) Repair the damage in accordance with a method approved by 
either the Manager, New York Aircraft Certification Office (ACO), 
FAA; or Transport Canada Civil Aviation (or its delegated agent); 
and accomplish repetitive inspections in accordance with a

[[Page 11340]]

method and at a repetitive interval approved by same.
    (2) Replace the lower panel assembly, P/N CC670-10520, of the 
affected MLG door with a new or serviceable lower panel assembly 
having the same P/N, in accordance with Task Cards 32-12-01-000-801-
A01 and 32-12-01-400-801-A01 of the CRJ 700/900 Series Regional Jet 
Aircraft Maintenance Manual; and repeat the inspections specified in 
paragraph (g) of this AD at intervals not to exceed 100 flight 
cycles.
    (3) Remove the lower panel assembly, P/N CC670-10520, of the 
affected MLG door, and accomplish paragraph (i)(3)(i) or (i)(3)(ii), 
as applicable.
    (i) For Model CL600-2C10 (Regional Jet series 700 & 701) series 
airplanes: Revise the Configuration Deviation List (CDL), Appendix 
1, of the airplane flight manual (AFM), to include the following 
limitations. This may be accomplished by inserting a copy of this AD 
into the CDL of the AFM.
    ``For Model CL600-2C10 series airplanes: If one or both door 
panel assemblies, part number CC670-10520, is missing:
    (1) Take-off Weight is reduced by 202.5 kg/door, or 450 lb/door
    (2) Enroute Climb Weight is reduced by 445.5 kg/door, or 990 lb/
door
    (3) Landing Weight is reduced by 202.5 kg/door, or 450 lb/door
    (4) Fuel Consumption is increased by +3.42% on fuel used/door
    (5) Cruise Airspeed is limited to not more than 0.78 Mach.''
    (ii) For Model CL-600-2D24 (Regional Jet series 900) series 
airplanes: Revise the CDL, Appendix 1, of the AFM, to include the 
following limitations. This may be accomplished by inserting a copy 
of this AD into the CDL of the AFM.
    ``For Model CL600-2D24 series airplanes: If one or both door 
panel assemblies, part number CC670-10520, is missing:
    (1) Take-off Weight is reduced by 245 kg/door, or 540 lb/door
    (2) Enroute Climb Weight is reduced by 551 kg/door, or 1,215 lb/
door
    (3) Landing Weight is reduced by 245 kg/door, or 540 lb/door
    (4) Fuel Consumption is increased by +3.42% on fuel used/door
    (5)Cruise Airspeed is limited to not more than 0.78 Mach.''

New Requirements of This AD

Inboard MLG Door Inspections

    (j) For all airplanes on which an inspection has not been done 
in accordance with paragraph (g) of this AD on or before the 
effective date of this AD: At the applicable time specified in 
paragraph (j)(1) or (j)(2) of this AD, do the inspections of the 
left- and right-hand inboard MLG doors for damage in accordance with 
Part A of the Accomplishment Instructions of the Bombardier Alert 
Service Bulletin A670BA-32-016, Revision A, dated June 7, 2005, 
including Appendix B, dated June 2, 2005, excluding Appendix A, 
dated June 2, 2005. Doing the inspections required by this paragraph 
terminates the actions required by paragraphs (f) through (i) of 
this AD.
    (1) For airplanes that have accumulated fewer than 1,500 total 
flight cycles as of the effective date of this AD: Before the 
accumulation of 1,000 total flight cycles or within 50 flight cycles 
after the effective date of this AD, whichever occurs later.
    (2) For airplanes that have accumulated 1,500 flight cycles or 
more as of the effective date of this AD: Within 10 flight cycles 
after the effective date of this AD.
    (k) For all airplanes on which an inspection has been done in 
accordance with paragraph (g) of this AD on or before the effective 
date of this AD and on which both doors have not been removed in 
accordance with paragraph (i)(3) of this AD: At the applicable time 
specified in paragraph (k)(1) or (k)(2) of this AD, do the 
inspections specified in paragraph (j) of this AD; except for 
airplanes on which one door has been removed in accordance with 
paragraph (i)(3) of this AD, do the inspections specified in 
paragraph (j) of this AD for the door that has not been removed. 
Doing the inspections required by this paragraph terminates the 
actions required by paragraphs (f) through (i) of this AD.
    (1) For airplanes that are not subject to an approved 
alternative method of compliance (AMOC) that extends the inspection 
interval to 450 flight cycles: Within 100 flight cycles since the 
last inspection done in accordance with paragraph (g) of this AD.
    (2) For airplanes that are subject to an approved AMOC that 
extends the inspection interval to 450 flight cycles: At the earlier 
of the times specified in paragraph (k)(2)(i) and (k)(2)(ii) of this 
AD:
    (i) Within 450 flight cycles since the last inspection done in 
accordance with paragraph (g) of this AD.
    (ii) Within 100 flight cycles since the last inspection done in 
accordance with paragraph (g) of this AD or within 50 cycles after 
the effective date of this AD, whichever occurs later.
    (l) If no damage is found during any inspection done in 
accordance with paragraph (j) of this AD, repeat the inspections 
specified in paragraph (j) of this AD thereafter at intervals not to 
exceed 100 flight cycles.

Corrective Action--Replace or Remove MLG Door

    (m) If any damage is found during any inspection done in 
accordance with paragraph (j) of this AD, before further flight, do 
the actions in paragraph (m)(1) or (m)(2) of this AD. Repeat the 
inspections specified in paragraph (j) of this AD thereafter at 
intervals not to exceed 100 flight cycles.
    (1) Replace the inboard MLG door with a new or repaired door in 
accordance with Part B of the Accomplishment Instructions of the 
Bombardier Alert Service Bulletin A670BA-32-016, Revision A, dated 
June 7, 2005, including Appendix B, dated June 2, 2005, excluding 
Appendix A, dated June 2, 2005; except where the service bulletin 
specifies to contact the manufacturer for repair if no generic 
repair engineering order (REO) is available, before further flight, 
repair using a method approved by either the Manager, New York 
Aircraft Certification Office (ACO), FAA; or the Transport Canada 
Civil Aviation (TCCA) (or its delegated agent).
    (2) Remove the inboard MLG door in accordance with Part B of the 
Accomplishment Instructions of the Bombardier Alert Service Bulletin 
A670BA-32-016, Revision A, dated June 7, 2005, including Appendix B, 
dated June 2, 2005, excluding Appendix A, dated June 2, 2005; and 
accomplish paragraph (m)(2)(i) or (m)(2)(ii), as applicable.
    (i) For Model CL-600-2C10 (Regional Jet Series 700, 701, & 702) 
airplanes and Model CL-600-2D15 (Regional Jet Series 705) airplanes: 
Revise the Configuration Deviation List (CDL), Appendix 1, of the 
airplane flight manual (AFM), to include the following limitations. 
This may be accomplished by inserting a copy of this AD into the CDL 
of the AFM. Remove any existing CDL limitation required by paragraph 
(i)(3)(i) of this AD from the AFM.
    ``For Model CL-600-2C10 (Regional Jet Series 700, 701, & 702) 
airplanes and Model CL-600-2D15 (Regional Jet Series 705) airplanes: 
If one or both door panel assemblies, part number CC670-10520, is 
missing:
    (1) Take-off Weight is reduced by 202.5 kg/door, or 450 lb/door
    (2) Enroute Climb Weight is reduced by 445.5 kg/door, or 990 lb/
door
    (3) Landing Weight is reduced by 202.5 kg/door, or 450 lb/door
    (4) Fuel Consumption is increased by +2.5% on fuel used/door
    (5) Cruise Airspeed is limited to not more than 0.78 Mach
    (6) The climb ceiling obtained from the Flight Planning and 
Cruise Control Manual (FPCCM) must be reduced by 1,000 ft/door.''


    Note 2: When a statement with the information specified in 
paragraph (m)(2)(i) of this AD has been included in the general 
revisions of the AFM, the general revisions may be inserted into the 
AFM, and the copy of this AD may be removed from the AFM.

    (ii) For Model CL-600-2D24 (Regional Jet Series 900) airplanes: 
Revise the CDL, Appendix 1, of the AFM, to include the following 
limitations. This may be accomplished by inserting a copy of this AD 
into the CDL of the AFM. Remove any existing CDL limitation required 
by paragraph (i)(3)(ii) of this AD from the AFM.
    ``For Model CL-600-2D24 (Regional Jet Series 900) airplanes: If 
one or both door panel assemblies, part number CC670-10520, is 
missing:
    (1) Take-off Weight is reduced by 245 kg/door, or 540 lb/door
    (2) Enroute Climb Weight is reduced by 551 kg/door, or 1,215 lb/
door
    (3) Landing Weight is reduced by 245 kg/door, or 540 lb/door
    (4) Fuel Consumption is increased by +2.5% on fuel used/door
    (5)Cruise Airspeed is limited to not more than 0.78 Mach
    (6)The climb ceiling obtained from the Flight Planning and 
Cruise Control Manual (FPCCM) must be reduced by 1,000 ft/door.''


    Note 3: When a statement with the information specified in 
paragraph (m)(2)(ii) of this AD has been included in the general 
revisions of the AFM, the general revisions may be inserted into the 
AFM, and the copy of this AD may be removed from the AFM.


[[Page 11341]]



Revise CDL

    (n) For airplanes on which the door(s) have been removed in 
accordance with paragraph (i)(3) of this AD: Within 30 days after 
the effective date of this AD, do the revision specified in 
paragraph (m)(2)(i) or (m)(2)(ii) of this AD, as applicable, and 
remove any revision required by paragraph (i)(3)(i) or (i)(3)(ii) of 
this AD.

No Reporting Required

    (o) Although Bombardier Alert Service Bulletin A670BA-32-016, 
Revision A, dated June 7, 2005, specifies to submit certain 
information to the manufacturer, this AD does not include that 
requirement.

Actions Accomplished According to Previous Issue of Service 
Bulletin

    (p) Actions accomplished before the effective date of this AD 
according to Bombardier Alert Service Bulletin A670BA-32-016, dated 
June 2, 2005, are considered acceptable for compliance with the 
corresponding action specified in this AD.

Alternative Methods of Compliance (AMOCs)

    (q)(1) The Manager, New York Aircraft Certification Office 
(ACO), FAA, has the authority to approve AMOCs for this AD, if 
requested in accordance with the procedures found in 14 CFR 39.19.
    (2) Before using any AMOC approved in accordance with Sec.  
39.19 on any airplane to which the AMOC applies, notify the 
appropriate principal inspector in the FAA Flight Standards 
Certificate Holding District Office.
    (3) AMOCs approved previously in accordance with AD 2003-19-51 
are not approved as AMOCs with this AD.

Related Information

    (r) Canadian airworthiness directive CF-2003-23R2, dated July 
27, 2005, also addresses the subject of this AD.

    Issued in Renton, Washington, on February 22, 2006.
Michael J. Kaszycki,
Acting Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. 06-2159 Filed 3-6-06; 8:45 am]
BILLING CODE 4910-13-P