Airworthiness Directives; Bombardier Model CL-600-1A11 (CL-600), CL-600-2A12 (CL-601), CL-600-2B16 (CL-601-3A, CL-601-3R, and CL-604) Airplanes, 20777-20780 [E7-7979]

Download as PDF 20777 Federal Register / Vol. 72, No. 80 / Thursday April 26, 2007 / Proposed Rules 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. 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. List of Subjects in 14 CFR Part 39 § 39.13 Air transportation, Aircraft, Aviation safety, Safety. [Amended] 2. The Federal Aviation Administration (FAA) amends § 39.13 by adding the following new airworthiness directive (AD): LEARJET: Docket No. FAA–2007–28016; Directorate Identifier 2006–NM–227–AD. Comments Due Date (a) The FAA must receive comments on this AD action by June 11, 2007. Affected ADs (b) None. Applicability (c) This AD applies to Learjet Model 31, 31A, 35, 35A (C–21A), 36, 36A, 55, 55B, and 55C airplanes, and Model 45 airplanes; certificated in any category; as identified in the service information specified in Table 1 of this AD. TABLE 1.—APPLICABLE SERVICE INFORMATION Learjet airplane model Service bulletin Revision level 31/31A ......................................... 45 ................................................ 35/35A (C–21A) and 36/36A ...... 55/55B/55C ................................. Bombardier Service Bulletin 31–54–2 ............................................. Bombardier Service Bulletin 45–54–3 ............................................. Learjet Service Bulletin 35/36–54–3 ............................................... Learjet Service Bulletin 55–54–3 .................................................... 1 ....................... 2 ....................... Original ............. Original ............. Unsafe Condition (d) This AD results from a report that unsealed gaps (penetration points) of the engine firewall were discovered during production. We are issuing this AD to prevent penetration of flammable liquids or fire through the engine firewall into the engine pylon, which could lead to fire inside 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. Inspecting, Cleaning, and Sealing of Gaps in Engine Firewall (f) Within 12 months after the effective date of this AD, do the actions described in paragraphs (f)(1) and (f)(2) of this AD, in accordance with the applicable service information specified in Table 1 of this AD. (1) For all airplanes: Inspect for unsealed gaps on the pylon side of the engine firewall and clean and seal any unsealed gap. (2) For Learjet Model 45 airplanes only: Inspect the engine pylon trailing edge for unsealed gaps, and clean and seal any unsealed gap. DEPARTMENT OF TRANSPORTATION (h)(1) The Manager, Wichita 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) To request a different method of compliance or a different compliance time for this AD, follow the procedures in 14 CFR 39.19. Before using any approved AMOC on any airplane to which the AMOC applies, notify your appropriate principal inspector (PI) in the FAA Flight Standards District Office (FSDO), or lacking a PI, your local FSDO. Federal Aviation Administration Issued in Renton, Washington, on April 19, 2007. Ali Bahrami, Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. E7–8001 Filed 4–25–07; 8:45 am] BILLING CODE 4910–13–P jlentini on PROD1PC65 with PROPOSALS (g) Actions accomplished before the effective date of this AD according to Bombardier Service Bulletin 31–54–2, dated March 16, 2001; or Bombardier Service Bulletin 45–54–3, dated March 16, 2001; or Revision 1, dated December 12, 2001; as applicable; are considered acceptable for compliance with the corresponding action specified in this AD. 21:14 Apr 25, 2007 Jkt 211001 August 21, 2006. August 15, 2003. March 16, 2001. March 16, 2001. Alternative Methods of Compliance (AMOCs) Credit for Actions Done Using Previous Service Information VerDate Aug<31>2005 Date PO 00000 Frm 00004 Fmt 4702 Sfmt 4702 14 CFR Part 39 [Docket No. FAA–2006–26353; Directorate Identifier 2006–NM–189–AD] RIN 2120–AA64 Airworthiness Directives; Bombardier Model CL–600–1A11 (CL–600), CL– 600–2A12 (CL–601), CL–600–2B16 (CL– 601–3A, CL–601–3R, and CL–604) Airplanes Federal Aviation Administration (FAA), Department of Transportation (DOT). ACTION: Supplemental notice of proposed rulemaking (NPRM); reopening of comment period. AGENCY: SUMMARY: The FAA is revising an earlier NPRM for an airworthiness directive (AD) that applies to certain Bombardier Model CL–600–1A11 (CL–600) airplanes, CL–600–2A12 (CL–601) airplanes, and CL–600–2B16 (CL–601– 3A, CL–601–3R, and CL–604) airplanes. The original NPRM would have required inspecting to identify the part number and serial number of the selector valves of the nose landing gear (NLG) and the nose gear door; and doing related investigative and corrective actions if necessary. The original NPRM resulted from reports of uncommanded partial retractions of the NLG. This action revises the original NPRM by adding airplanes to the applicability. E:\FR\FM\26APP1.SGM 26APP1 20778 Federal Register / Vol. 72, No. 80 / Thursday April 26, 2007 / Proposed Rules jlentini on PROD1PC65 with PROPOSALS We are proposing this supplemental NPRM to prevent internal leakage of the selector valve, which, under certain conditions, could result in an uncommanded retraction of the NLG with consequent damage to the airplane and possible serious injury to ground personnel. DATES: We must receive comments on this supplemental NPRM by May 21, 2007. ADDRESSES: Use one of the following addresses to submit comments on this supplemental NPRM. • DOT Docket Web site: Go to https:// dms.dot.gov and follow the instructions for sending your comments electronically. • Government-wide rulemaking Web site: Go to https://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: Daniel Parrillo, Aerospace Engineer, Systems and Flight Test Branch, ANE– 172, FAA, New York Aircraft Certification Office, 1600 Stewart Avenue, suite 410, Westbury, New York 11590; telephone (516) 228–7305; fax (516) 794–5531. SUPPLEMENTARY INFORMATION: Comments Invited We invite you to submit any relevant written data, views, or arguments regarding this supplemental NPRM. Send your comments to an address listed in the ADDRESSES section. Include the docket number ‘‘Docket No. FAA– 2006–26353; Directorate Identifier 2006–NM–189–AD’’ at the beginning of your comments. We specifically invite comments on the overall regulatory, economic, environmental, and energy aspects of this supplemental NPRM. We will consider all comments received by the closing date and may amend this supplemental NPRM in light of those comments. We will post all comments submitted, without change, to https://dms.dot.gov, including any personal information you VerDate Aug<31>2005 21:14 Apr 25, 2007 Jkt 211001 provide. We will also post a report summarizing each substantive verbal contact with FAA personnel concerning this supplemental NPRM. 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 https://dms.dot.gov. Examining the Docket You may examine the AD docket on the Internet at https://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 in the Nassif Building at the DOT street address stated in ADDRESSES. Comments will be available in the AD docket shortly after the Docket Management System receives them. Discussion We proposed to amend 14 CFR part 39 with a notice of proposed rulemaking (NPRM) for an airworthiness directive (AD) (the ‘‘original NPRM’’). The original NPRM applies to certain Bombardier Model CL–600–1A11 (CL– 600) airplanes, CL–600–2A12 (CL–601) airplanes, and CL–600–2B16 (CL–601– 3A, CL–601–3R, and CL–604) airplanes. The original NPRM was published in the Federal Register on November 20, 2006 (71 FR 67079). The original NPRM proposed to require inspecting to identify the part number and serial number of the selector valves of the nose landing gear (NLG) and the nose gear door, and doing related investigative and corrective actions if necessary. Actions Since Original NPRM Was Issued Since the original NPRM was issued, Bombardier has determined that additional airplanes are subject to the unsafe condition. Relevant Service Information Bombardier has issued Service Bulletin 604–32–021, Revision 02, dated February 20, 2007 (for Model CL–600– 2B16 (CL–604) airplanes). The service bulletin adds airplanes to the effectivity; however, Revision 02 is technically identical to Revision 01, dated February 20, 2006. We referred to Revision 01 as the appropriate source of service PO 00000 Frm 00005 Fmt 4702 Sfmt 4702 information for doing the actions specified in the original NPRM. Accomplishing the actions specified in the service information is intended to adequately address the unsafe condition. FAA’s Determination and Proposed Requirements of the Supplemental NPRM Certain changes discussed above expand the scope of the original NPRM; therefore, we have determined that it is necessary to reopen the comment period to provide additional opportunity for public comment on this supplemental NPRM. Difference Between Supplemental NPRM and Canadian Airworthiness Directive Although Canadian airworthiness directive CF–2006–16, dated July 6, 2006, applies to certain airplanes as identified in Service Bulletin 604–32– 021, Revision 01, this supplemental NPRM would apply to those airplanes and certain additional airplanes, as identified in Service Bulletin 604–32– 021, Revision 02. This difference has been coordinated with TCCA. Costs of Compliance This proposed AD would affect about 502 airplanes of U.S. registry. The inspection to determine the manufacturer P/N and S/N of the selector valve(s) would take about 1 work hour per airplane, at an average labor rate of $80 per work hour. Based on these figures, the estimated cost of the proposed AD for U.S. operators is $40,160, or $80 per airplane. The general visual inspection of the selector valve(s), if accomplished, would take about 1 work hour per airplane, at an average labor rate of $80 per work hour. Based on these figures, the estimated cost of the proposed AD for U.S. operators is $80 per airplane. 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 E:\FR\FM\26APP1.SGM 26APP1 20779 Federal Register / Vol. 72, No. 80 / Thursday April 26, 2007 / Proposed Rules 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 supplemental NPRM 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. § 39.13 [Amended] 2. The Federal Aviation Administration (FAA) amends § 39.13 by adding the following new airworthiness directive (AD): BOMBARDIER, INC. (Formerly Canadair): Docket No. FAA–2006–26353; Directorate Identifier 2006–NM–189–AD. Comments Due Date (a) The FAA must receive comments on this AD action by May 21, 2007. Affected ADs (b) None. Applicability (c) This AD applies to Bombardier Model CL–600–1A11 (CL–600) airplanes, CL–600– 2A12 (CL–601) airplanes, and CL–600–2B16 (CL–601–3A, CL–601–3R, and CL–604) airplanes; certificated in any category; having serial numbers (S/Ns) as identified in the service bulletins specified in Table 1 of this AD, as applicable. TABLE 1.—BOMBARDIER SERVICE BULLETINS Revision level Service Bulletin 600–0721 (for Model CL–600–1A11 (CL–600) airplanes) ............................................................................ 601–0558 (for Model CL–600–2A12 (CL–601) airplanes, and CL–600–2B16 (CL–601–3A and CL–601– 3R) airplanes). 604–32–021 (for Model CL–600–2B16 (CL–604) airplanes) ........................................................................ Unsafe Condition (d) This AD results from reports of uncommanded partial retractions of the nose landing gear (NLG). We are issuing this AD to prevent internal leakage of the selector valve, which, under certain conditions, could result in an uncommanded retraction of the NLG with consequent damage to the airplane and possible serious injury to ground personnel. 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. jlentini on PROD1PC65 with PROPOSALS Inspection and Corrective Actions (f) Within 500 flight hours or 12 months after the effective date of this AD, whichever occurs first, inspect to determine the manufacturer part number (P/N) and S/N of the selector valves of the NLG and nose gear door. A review of airplane maintenance records is acceptable in lieu of this inspection if the S/Ns of the selector valves can be conclusively determined from that review. For any subject selector valve having Tactair Fluid Controls P/N 750006000 and a S/N from 0001 through 0767 inclusive, before further flight, do related investigative (including a general visual inspection for proper installation of the lock wire of the end cap) and corrective actions; in accordance VerDate Aug<31>2005 21:14 Apr 25, 2007 Jkt 211001 with the applicable service bulletins identified in Table 1 of this AD. Note 1: Operators should be aware that selector valves having Bombardier P/N 601R75146–1 may be supplied by different manufacturers and have different manufacturer part numbers. Only airplanes having selector valves manufactured by Tactair Fluid Controls, having P/N 750006000, are subject to the investigative and corrective actions specified in paragraph (f) of this AD. Note 2: For the purposes of this AD, a general visual inspection is: ‘‘A visual examination of an interior or exterior area, installation, or assembly to detect obvious damage, failure, or irregularity. This level of inspection is made from within touching distance unless otherwise specified. A mirror may be necessary to ensure visual access to all surfaces in the inspection area. This level of inspection is made under normally available lighting conditions such as daylight, hangar lighting, flashlight, or droplight and may require removal or opening of access panels or doors. Stands, ladders, or platforms may be required to gain proximity to the area being checked.’’ Note 3: The service bulletins identified in Table 1 of this AD refer to Tactair Fluid Controls Service Bulletin SB750006000–1, Revision A, dated September 6, 2005, as an additional source of service information for PO 00000 Frm 00006 Fmt 4702 Sfmt 4702 Date 01 01 February 20, 2006. February 20, 2006. 02 February 20, 2007. doing the related investigative and corrective actions required by this AD. Actions Accomplished According to Previous Issue of Service Bulletin (g) Actions accomplished before the effective date of this AD according to Bombardier Service Bulletin 604–32–021, Revision 01, dated February 20, 2006 (for Model CL–600–2B16 (CL–604) airplanes), are considered acceptable for compliance with the corresponding actions specified in this AD. Alternative Methods of Compliance (AMOCs) (h)(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. Related Information (i) Canadian airworthiness directive CF– 2006–16, dated July 6, 2006, also addresses the subject of this AD. E:\FR\FM\26APP1.SGM 26APP1 20780 Federal Register / Vol. 72, No. 80 / Thursday April 26, 2007 / Proposed Rules Issued in Renton, Washington, on April 19, 2007. Ali Bahrami, Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. E7–7979 Filed 4–25–07; 8:45 am] BILLING CODE 4910–13–P DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14 CFR Part 39 [Docket No. FAA–2007–27680; Directorate Identifier 2007–CE–026–AD] RIN 2120–AA64 Airworthiness Directives; AEROTECHNIC Vertriebs-u. Service GmbH Honeywell CAS67A ACAS II Systems Appliances Federal Aviation Administration (FAA), Department of Transportation (DOT). ACTION: Notice of proposed rulemaking (NPRM). AGENCY: SUMMARY: We propose to adopt a new airworthiness directive (AD) for the products listed above. This proposed AD results from mandatory continuing airworthiness information (MCAI) originated by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as: jlentini on PROD1PC65 with PROPOSALS It was detected by the STC holder that in earlier installations of the ACASII system there were no isolation diodes installed in the Heading and Attitude Valid lines. The absence of an isolation diode in the valid lines can prevent the valid flag to come up even if a gyro fault exists. The problem has only been detected for Heading Valid lines but could equally affect the Altitude Valid lines. With installation of the ACASII, the heading and attitude valid lines have to be connected to the TPU67A. On valid state, the signals are +28VDC. On invalid, the signals are open. This condition of direct connection (without an isolation diode installed) of the valid lines to the TPU67A, if not corrected, could cause the TPU67A to feed current into the open stated valid lines. This prevents the flag to appear even if the gyro is invalid, providing the flight crew with erroneous navigation information. The proposed AD would require actions that are intended to address the unsafe condition described in the MCAI. DATES: We must receive comments on this proposed AD by May 29, 2007. ADDRESSES: You may send comments by any of the following methods: • DOT Docket Web Site: Go to https:// dms.dot.gov and follow the instructions VerDate Aug<31>2005 21:14 Apr 25, 2007 Jkt 211001 for sending your comments electronically. • Fax: (202) 493–2251. • Mail: Docket Management Facility, U.S. Department of Transportation, 400 Seventh Street, SW., Nassif Building, Room PL–401, Washington, DC 20590– 0001. • 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. • Federal eRulemaking Portal: Go to https://www.regulations.gov. Follow the instructions for submitting comments. Examining the AD Docket You may examine the AD docket on the Internet at https://dms.dot.gov; or in person at the Docket Management Facility between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. The AD docket contains this proposed AD, the regulatory evaluation, any comments received, and other information. The street address for the Docket Office (telephone (800) 647– 5227) is in the ADDRESSES section. Comments will be available in the AD docket shortly after receipt. FOR FURTHER INFORMATION CONTACT: Karl Schletzbaum, Aerospace Engineer, FAA, Small Airplane Directorate, 901 Locust, Room 301, Kansas City, Missouri 64106; telephone: (816) 329–4146; fax: (816) 329–4090. SUPPLEMENTARY INFORMATION: Streamlined Issuance of AD The FAA is implementing a new process for streamlining the issuance of ADs related to MCAI. This streamlined process will allow us to adopt MCAI safety requirements in a more efficient manner and will reduce safety risks to the public. This process continues to follow all FAA AD issuance processes to meet legal, economic, Administrative Procedure Act, and Federal Register requirements. We also continue to meet our technical decision-making responsibilities to identify and correct unsafe conditions on U.S.-certificated products. This proposed AD references the MCAI and related service information that we considered in forming the engineering basis to correct the unsafe condition. The proposed AD contains text copied from the MCAI and for this reason might not follow our plain language principles. Comments Invited We invite you to send any written relevant data, views, or arguments about this proposed AD. Send your comments to an address listed under the PO 00000 Frm 00007 Fmt 4702 Sfmt 4702 section. Include ‘‘Docket No. FAA–2007–27680; Directorate Identifier 2007–CE–026–AD’’ at the beginning of your comments. We specifically invite comments on the overall regulatory, economic, environmental, and energy aspects of this proposed AD. We will consider all comments received by the closing date and may amend this proposed AD because of those comments. We will post all comments we receive, without change, to https:// dms.dot.gov, including any personal information you provide. We will also post a report summarizing each substantive verbal contact we receive about this proposed AD. ADDRESSES Discussion The European Aviation Safety Agency (EASA), which is the Technical Agent for the Member States of the European Community, has issued EASA AD No. 2007–0059 dated March 5, 2007 (referred to after this as ‘‘the MCAI’’), to correct an unsafe condition for the specified products. The MCAI states: It was detected by the STC holder that in earlier installations of the ACASII system there were no isolation diodes installed in the Heading and Attitude Valid lines. The absence of an isolation diode in the valid lines can prevent the valid flag to come up even if a gyro fault exists. The problem has only been detected for Heading Valid lines but could equally affect the Attitude Valid lines. With installation of the ACASII, the heading and attitude valid lines have to be connected to the TPU67A. On valid state, the signals are +28VDC. On invalid, the signals are open. This condition of direct connection (without an isolation diode installed) of the valid lines to the TPU67A, if not corrected, could cause the TPU67A to feed current into the open stated valid lines. This prevents the flag to appear even if the gyro is invalid, providing the flight crew with erroneous navigation information. For the reasons stated above, this Airworthiness Directive (AD) requires the installation of isolation diodes into the signal lines to the TPU67A to prevent reverse feed of the valid lines. You may obtain further information by examining the MCAI in the AD docket. Relevant Service Information Aerotechnic Vertiebs -u. Service GmbH has issued Service Bulletin No. DO228–119780–0104, Revision 2, dated December 21, 2006. The actions described in this service information are intended to correct the unsafe condition identified in the MCAI. E:\FR\FM\26APP1.SGM 26APP1

Agencies

[Federal Register Volume 72, Number 80 (Thursday, April 26, 2007)]
[Proposed Rules]
[Pages 20777-20780]
From the Federal Register Online via the Government Printing Office [www.gpo.gov]
[FR Doc No: E7-7979]


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

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2006-26353; Directorate Identifier 2006-NM-189-AD]
RIN 2120-AA64


Airworthiness Directives; Bombardier Model CL-600-1A11 (CL-600), 
CL-600-2A12 (CL-601), CL-600-2B16 (CL-601-3A, CL-601-3R, and CL-604) 
Airplanes

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

ACTION: Supplemental notice of proposed rulemaking (NPRM); reopening of 
comment period.

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

SUMMARY: The FAA is revising an earlier NPRM for an airworthiness 
directive (AD) that applies to certain Bombardier Model CL-600-1A11 
(CL-600) airplanes, CL-600-2A12 (CL-601) airplanes, and CL-600-2B16 
(CL-601-3A, CL-601-3R, and CL-604) airplanes. The original NPRM would 
have required inspecting to identify the part number and serial number 
of the selector valves of the nose landing gear (NLG) and the nose gear 
door; and doing related investigative and corrective actions if 
necessary. The original NPRM resulted from reports of uncommanded 
partial retractions of the NLG. This action revises the original NPRM 
by adding airplanes to the applicability.

[[Page 20778]]

We are proposing this supplemental NPRM to prevent internal leakage of 
the selector valve, which, under certain conditions, could result in an 
uncommanded retraction of the NLG with consequent damage to the 
airplane and possible serious injury to ground personnel.

DATES: We must receive comments on this supplemental NPRM by May 21, 
2007.

ADDRESSES: Use one of the following addresses to submit comments on 
this supplemental NPRM.
     DOT Docket Web site: Go to https://dms.dot.gov and follow 
the instructions for sending your comments electronically.
     Government-wide rulemaking Web site: Go to https://
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: Daniel Parrillo, Aerospace Engineer, 
Systems and Flight Test Branch, ANE-172, FAA, New York Aircraft 
Certification Office, 1600 Stewart Avenue, suite 410, Westbury, New 
York 11590; telephone (516) 228-7305; fax (516) 794-5531.

SUPPLEMENTARY INFORMATION:

Comments Invited

    We invite you to submit any relevant written data, views, or 
arguments regarding this supplemental NPRM. Send your comments to an 
address listed in the ADDRESSES section. Include the docket number 
``Docket No. FAA-2006-26353; Directorate Identifier 2006-NM-189-AD'' at 
the beginning of your comments. We specifically invite comments on the 
overall regulatory, economic, environmental, and energy aspects of this 
supplemental NPRM. We will consider all comments received by the 
closing date and may amend this supplemental NPRM in light of those 
comments.
    We will post all comments submitted, without change, to https://
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 supplemental NPRM. 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 https://dms.dot.gov.

Examining the Docket

    You may examine the AD docket on the Internet at https://
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 in the Nassif Building at the DOT 
street address stated in ADDRESSES. Comments will be available in the 
AD docket shortly after the Docket Management System receives them.

Discussion

    We proposed to amend 14 CFR part 39 with a notice of proposed 
rulemaking (NPRM) for an airworthiness directive (AD) (the ``original 
NPRM''). The original NPRM applies to certain Bombardier Model CL-600-
1A11 (CL-600) airplanes, CL-600-2A12 (CL-601) airplanes, and CL-600-
2B16 (CL-601-3A, CL-601-3R, and CL-604) airplanes. The original NPRM 
was published in the Federal Register on November 20, 2006 (71 FR 
67079). The original NPRM proposed to require inspecting to identify 
the part number and serial number of the selector valves of the nose 
landing gear (NLG) and the nose gear door, and doing related 
investigative and corrective actions if necessary.

Actions Since Original NPRM Was Issued

    Since the original NPRM was issued, Bombardier has determined that 
additional airplanes are subject to the unsafe condition.

Relevant Service Information

    Bombardier has issued Service Bulletin 604-32-021, Revision 02, 
dated February 20, 2007 (for Model CL-600-2B16 (CL-604) airplanes). The 
service bulletin adds airplanes to the effectivity; however, Revision 
02 is technically identical to Revision 01, dated February 20, 2006. We 
referred to Revision 01 as the appropriate source of service 
information for doing the actions specified in the original NPRM. 
Accomplishing the actions specified in the service information is 
intended to adequately address the unsafe condition.

FAA's Determination and Proposed Requirements of the Supplemental NPRM

    Certain changes discussed above expand the scope of the original 
NPRM; therefore, we have determined that it is necessary to reopen the 
comment period to provide additional opportunity for public comment on 
this supplemental NPRM.

Difference Between Supplemental NPRM and Canadian Airworthiness 
Directive

    Although Canadian airworthiness directive CF-2006-16, dated July 6, 
2006, applies to certain airplanes as identified in Service Bulletin 
604-32-021, Revision 01, this supplemental NPRM would apply to those 
airplanes and certain additional airplanes, as identified in Service 
Bulletin 604-32-021, Revision 02. This difference has been coordinated 
with TCCA.

Costs of Compliance

    This proposed AD would affect about 502 airplanes of U.S. registry.
    The inspection to determine the manufacturer P/N and S/N of the 
selector valve(s) would take about 1 work hour per airplane, at an 
average labor rate of $80 per work hour. Based on these figures, the 
estimated cost of the proposed AD for U.S. operators is $40,160, or $80 
per airplane.
    The general visual inspection of the selector valve(s), if 
accomplished, would take about 1 work hour per airplane, at an average 
labor rate of $80 per work hour. Based on these figures, the estimated 
cost of the proposed AD for U.S. operators is $80 per airplane.

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

[[Page 20779]]

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 supplemental NPRM 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 
adding the following new airworthiness directive (AD):

BOMBARDIER, INC. (Formerly Canadair): Docket No. FAA-2006-26353; 
Directorate Identifier 2006-NM-189-AD.

Comments Due Date

    (a) The FAA must receive comments on this AD action by May 21, 
2007.

Affected ADs

    (b) None.

Applicability

    (c) This AD applies to Bombardier Model CL-600-1A11 (CL-600) 
airplanes, CL-600-2A12 (CL-601) airplanes, and CL-600-2B16 (CL-601-
3A, CL-601-3R, and CL-604) airplanes; certificated in any category; 
having serial numbers (S/Ns) as identified in the service bulletins 
specified in Table 1 of this AD, as applicable.

                                     Table 1.--Bombardier Service Bulletins
----------------------------------------------------------------------------------------------------------------
                                                      Revision
                 Service Bulletin                      level                           Date
----------------------------------------------------------------------------------------------------------------
600-0721 (for Model CL-600-1A11 (CL-600)                     01  February 20, 2006.
 airplanes).
601-0558 (for Model CL-600-2A12 (CL-601)                     01  February 20, 2006.
 airplanes, and CL-600-2B16 (CL-601-3A and CL-601-
 3R) airplanes).
604-32-021 (for Model CL-600-2B16 (CL-604)                   02  February 20, 2007.
 airplanes).
----------------------------------------------------------------------------------------------------------------

Unsafe Condition

    (d) This AD results from reports of uncommanded partial 
retractions of the nose landing gear (NLG). We are issuing this AD 
to prevent internal leakage of the selector valve, which, under 
certain conditions, could result in an uncommanded retraction of the 
NLG with consequent damage to the airplane and possible serious 
injury to ground personnel.

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.

Inspection and Corrective Actions

    (f) Within 500 flight hours or 12 months after the effective 
date of this AD, whichever occurs first, inspect to determine the 
manufacturer part number (P/N) and S/N of the selector valves of the 
NLG and nose gear door. A review of airplane maintenance records is 
acceptable in lieu of this inspection if the S/Ns of the selector 
valves can be conclusively determined from that review. For any 
subject selector valve having Tactair Fluid Controls P/N 750006000 
and a S/N from 0001 through 0767 inclusive, before further flight, 
do related investigative (including a general visual inspection for 
proper installation of the lock wire of the end cap) and corrective 
actions; in accordance with the applicable service bulletins 
identified in Table 1 of this AD.

    Note 1: Operators should be aware that selector valves having 
Bombardier P/N 601R75146-1 may be supplied by different 
manufacturers and have different manufacturer part numbers. Only 
airplanes having selector valves manufactured by Tactair Fluid 
Controls, having P/N 750006000, are subject to the investigative and 
corrective actions specified in paragraph (f) of this AD.


    Note 2: For the purposes of this AD, a general visual inspection 
is: ``A visual examination of an interior or exterior area, 
installation, or assembly to detect obvious damage, failure, or 
irregularity. This level of inspection is made from within touching 
distance unless otherwise specified. A mirror may be necessary to 
ensure visual access to all surfaces in the inspection area. This 
level of inspection is made under normally available lighting 
conditions such as daylight, hangar lighting, flashlight, or 
droplight and may require removal or opening of access panels or 
doors. Stands, ladders, or platforms may be required to gain 
proximity to the area being checked.''


    Note 3: The service bulletins identified in Table 1 of this AD 
refer to Tactair Fluid Controls Service Bulletin SB750006000-1, 
Revision A, dated September 6, 2005, as an additional source of 
service information for doing the related investigative and 
corrective actions required by this AD.

Actions Accomplished According to Previous Issue of Service Bulletin

    (g) Actions accomplished before the effective date of this AD 
according to Bombardier Service Bulletin 604-32-021, Revision 01, 
dated February 20, 2006 (for Model CL-600-2B16 (CL-604) airplanes), 
are considered acceptable for compliance with the corresponding 
actions specified in this AD.

Alternative Methods of Compliance (AMOCs)

    (h)(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.

Related Information

    (i) Canadian airworthiness directive CF-2006-16, dated July 6, 
2006, also addresses the subject of this AD.


[[Page 20780]]


    Issued in Renton, Washington, on April 19, 2007.
Ali Bahrami,
Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
 [FR Doc. E7-7979 Filed 4-25-07; 8:45 am]
BILLING CODE 4910-13-P
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