Airworthiness Directives; Learjet Inc. Model 45 Airplanes, 64851-64854 [2011-27010]

Download as PDF Federal Register / Vol. 76, No. 202 / Wednesday, October 19, 2011 / Proposed Rules 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 this 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. List of Subjects in 14 CFR Part 39 Air transportation, Aircraft, Aviation safety, Incorporation by reference, 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 FAA amends § 39.13 by adding the following new AD: Bombardier, Inc.: Docket No. FAA–2011– 1088; Directorate Identifier 2011–NM– 099–AD. Comments Due Date (a) We must receive comments by December 5, 2011. Affected ADs (b) None. srobinson on DSK4SPTVN1PROD with PROPOSALS Applicability (c) This AD applies to Bombardier, Inc. Model DHC–8–400, –401, and –402 airplanes; certificated in any category; serial numbers 4161 through 4296 inclusive. Subject (d) Air Transport Association (ATA) of America Code 53: Fuselage. Reason (e) The mandatory continuing airworthiness information (MCAI) states: Several operators have reported difficulties in opening the airstair door. Investigation revealed that the airstair door gearbox drain paths were blocked by sealant, causing water VerDate Mar<15>2010 16:22 Oct 18, 2011 Jkt 226001 to accumulate and freeze in the gearbox assembly. An airstair door that is unable to be opened could hinder evacuation in the event of an emergency. * * * * * BILLING CODE 4910–13–P (f) You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done. DEPARTMENT OF TRANSPORTATION Federal Aviation Administration Actions (g) Within 600 flight hours after the effective date of this AD, do a general visual inspection of the structure and gearbox drain paths for blockages by sealant, in accordance with the Accomplishment Instructions of Bombardier Service Bulletin 84–53–48, dated December 2, 2010. If any blockages are found, before further flight, remove blockages in accordance with the Accomplishment Instructions of Bombardier Service Bulletin 84–53–48, dated December 2, 2010. FAA AD Differences Note 1: This AD differs from the MCAI and/or service information as follows: No differences. Other FAA AD Provisions (h) The following provisions also apply to this AD: (1) Alternative Methods of Compliance (AMOCs): The Manager, New York Aircraft Certification Office (ACO), ANE–170, FAA, has the authority to approve AMOCs for this AD, if requested using the procedures found in 14 CFR 39.19. In accordance with 14 CFR 39.19, send your request to your principal inspector or local Flight Standards District Office, as appropriate. If sending information directly to the ACO, send it to ATTN: Program Manager, Continuing Operational Safety, FAA, New York ACO, 1600 Stewart Avenue, Suite 410, Westbury, New York 11590; telephone 516–228–7300; fax 516– 794–5531. Before using any approved AMOC, notify your appropriate principal inspector, or lacking a principal inspector, the manager of the local flight standards district office/ certificate holding district office. The AMOC approval letter must specifically reference this AD. (2) Airworthy Product: For any requirement in this AD to obtain corrective actions from a manufacturer or other source, use these actions if they are FAA-approved. Corrective actions are considered FAA-approved if they are approved by the State of Design Authority (or their delegated agent). You are required to assure the product is airworthy before it is returned to service. Related Information (i) Refer to MCAI Transport Canada Civil Aviation (TCCA) Airworthiness Directive CF–2011–06, dated April 26, 2011; and Bombardier Service Bulletin 84–53–48, dated December 2, 2010; for related information. Frm 00013 Issued in Renton, Washington, on October 6, 2011. Ali Bahrami, Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. 2011–27023 Filed 10–18–11; 8:45 am] Compliance PO 00000 64851 Fmt 4702 Sfmt 4702 14 CFR Part 39 [Docket No. FAA–2011–1069; Directorate Identifier 2011–NM–025–AD] RIN 2120–AA64 Airworthiness Directives; Learjet Inc. Model 45 Airplanes Federal Aviation Administration (FAA), DOT. ACTION: Notice of proposed rulemaking (NPRM). AGENCY: We propose to adopt a new airworthiness directive (AD) for the products listed above. This proposed AD would require revising the maintenance program to include new or more restrictive life-limits and inspections. This proposed AD was prompted by changes to the Airworthiness Limitations Section (ALS) of the maintenance manual, which adds life-limits, revises lifelimits, or adds inspections not previously identified. We are proposing this AD to limit exposure of flight critical components to corrosion, cracking, or failure due to life-limits, which if not corrected, could result in loss of roll control, fatigue cracking, or loss of structural components. DATES: We must receive comments on this proposed AD by December 5, 2011. ADDRESSES: You may send comments by any of the following methods: • Federal eRulemaking Portal: Go to http://www.regulations.gov. Follow the instructions for submitting comments. • Fax: 202–493–2251. • Mail: U.S. Department of Transportation, Docket Operations, M–30, West Building Ground Floor, Room W12–140, 1200 New Jersey Avenue, SE., Washington, DC 20590. • Hand Delivery: Deliver to Mail address above between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. For service information identified in this proposed AD, contact Learjet, Inc., One Learjet Way, Wichita, Kansas 67209–2942; phone 316–946–2000; fax 316–946–2220; e-mail ac.ict@aero.bombardier.com; Internet SUMMARY: E:\FR\FM\19OCP1.SGM 19OCP1 64852 Federal Register / Vol. 76, No. 202 / Wednesday, October 19, 2011 / Proposed Rules http://www.bombardier.com. You may review copies of the referenced service information at the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington. For information on the availability of this material at the FAA, call 425–227–1221. Examining the AD Docket You may examine the AD docket on the Internet at http:// www.regulations.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 (phone: 800–647–5527) is in the ADDRESSES section. Comments will be available in the AD docket shortly after receipt. FOR FURTHER INFORMATION CONTACT: William Griffith, Aerospace Engineer, Airframe Branch, ACE–118W, FAA, Wichita Aircraft Certification Office, 1801 Airport Road, Room 100, MidContinent Airport, Wichita, Kansas 67209; phone: 316–946–4116; fax: 316– 946–4107; e-mail: William.E.Griffith@faa.gov. SUPPLEMENTARY INFORMATION: Comments Invited We invite you to send any written relevant data, views, or arguments about this proposal. Send your comments to an address listed under the ADDRESSES section. Include ‘‘Docket No. FAA– 2011–1069; Directorate Identifier 2011– NM–025–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 http:// www.regulations.gov, including any personal information you provide. We will also post a report summarizing each substantive verbal contact we receive about this proposed AD. Discussion We have reviewed the design approval holder’s changes to the ALS of the maintenance manual, which adds life-limits, revises life-limits, or adds inspections not previously identified. These changes resulted from the design holder’s analysis, testing, and in-service history of certain components. We are proposing this AD to limit exposure of flight critical components to corrosion, cracking, or failure due to life-limits, which if not corrected, could result in loss of roll control, fatigue cracking, or loss of structural components. The corrective action is revising the maintenance program. Relevant Service Information We reviewed Chapter 04, Airworthiness Limitations, of the Bombardier Learjet 45 Maintenance Manual MM–104, Revision 53, dated January 10, 2011; and Bombardier Learjet 40 Maintenance Manual MM– 105, Revision 21, dated January 10, 2011. This service information describes component and system checks and replacements and includes new or revised life-limits and new inspections. FAA’s Determination We are proposing this AD because we evaluated all the relevant information and determined the unsafe condition described previously is likely to exist or develop in other products of the same type design. Proposed AD Requirements This proposed AD would require accomplishing the actions specified in the service information described previously. Costs of Compliance We estimate that this proposed AD affects 336 of U.S. registry. We estimate the following costs to comply with this proposed AD: ESTIMATED COSTS Action Labor cost Parts cost Cost per product Cost on U.S. operators Change ALS in maintenance manual ............. 1 work-hour × $85 per hour = $85 ................. $0 $85 $28,560 srobinson on DSK4SPTVN1PROD 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 VerDate Mar<15>2010 16:22 Oct 18, 2011 Jkt 226001 products identified in this rulemaking action. Regulatory Findings We 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 this 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), PO 00000 Frm 00014 Fmt 4702 Sfmt 4702 (3) Will not affect intrastate aviation in Alaska, and (4) 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. List of Subjects in 14 CFR Part 39 Air transportation, Aircraft, Aviation safety, Incorporation by reference, 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: E:\FR\FM\19OCP1.SGM 19OCP1 Federal Register / Vol. 76, No. 202 / Wednesday, October 19, 2011 / Proposed Rules Authority: 49 U.S.C. 106(g), 40113, 44701. § 39.13 [Amended] 2. The FAA amends § 39.13 by adding the following new airworthiness directive (AD): Learjet Inc.: Docket No. FAA–2011–1069; Directorate Identifier 2011–NM–025–AD. Comments Due Date (a) We must receive comments by December 5, 2011. accomplish the inspections described in the revisions. In this situation, to comply with 14 CFR 91.403(c), the operator must request approval for an alternative method of compliance according to paragraph (i) of this AD. The request should include a description of changes to the required actions that will ensure the continued operational safety of the airplane. The FAA has provided guidance for this determination in Advisory Circular (AC) 25.1529–1A. Affected ADs (b) None Subject (d) Joint Aircraft System Component (JASC)/Air Transport Association (ATA) of America Code 05: Periodic Inspections. Applicability (c) This AD applies to all Learjet Inc. Model 45 airplanes, certificated in any category. Note 1: This AD requires revisions to certain operator maintenance documents to include new actions (e.g. inspections). Compliance with these actions is required by 14 CFR 91.403(c). For airplanes that have been previously modified, altered, or repaired in the areas addressed by these actions, the operator may not be able to Unsafe Condition (e) This AD was prompted by changes to the Airworthiness Limitations Section (ALS) of the maintenance manual (MM), which adds life-limits, revises life-limits, or adds inspections not previously identified. We are issuing this AD to limit exposure of flight critical components to corrosion, cracking, or failure due to life-limits, which if not corrected, could result in loss of roll control, fatigue cracking, or loss of structural components. 64853 Compliance (f) Comply with this AD within the compliance times specified, unless already done. Maintenance Program Revision (g) Within 90 days after the effective date of this AD, revise the maintenance program by incorporating the applicable inspection reference number (IRN) tasks identified in table 1 of this AD as specified in Chapter 04, Airworthiness Limitations, of the Bombardier Learjet 45 Maintenance Manual MM–104, Revision 53, dated January 10, 2011; or Bombardier Learjet 40 Maintenance Manual MM–105, Revision 21, dated January 10, 2011; as applicable. The initial task compliance time is within 90 days after the effective date of this AD, or the applicable initial compliance time specified in Table 1 of this AD, whichever is later. Note 2: IRN # R2710041 shown in table 1 of this AD is identified as IRN # N2710041 in prior revisions of Bombardier Learjet 45 Maintenance Manual MM–104; and Bombardier Learjet 40 Maintenance Manual MM–105. TABLE 1—IRN TASK REVISION IRN #— Initial compliance time— Model 40, 45 ...... R2710041 ............................................... Model 40, 45 ...... Q5510091 .............................................. Within 10 years after the date of issuance of the original standard airworthiness certificate or the date of issuance of the original export certificate of airworthiness, or within 10 years after the most recent replacement, whichever occurs later. Within 600 flight hours after the most recent inspection done in accordance with IRN # Q5510091. Model 40, 45 ...... Q5530011 .............................................. Before the accumulation of 9,600 total flight hours. Model 40, 45 ...... P3220007 ............................................... Within 48 months after the most recent inspection done in accordance with IRN # P3220007. Model 40, 45 ...... srobinson on DSK4SPTVN1PROD with PROPOSALS Model— P3220146 ............................................... Before the accumulation of 4,800 total landings. Model 40, 45 ...... N3220012, N3220023, N3220035, N3220036, and N3220037. Before the accumulation of 10,000 total landings on the component. VerDate Mar<15>2010 16:22 Oct 18, 2011 Jkt 226001 PO 00000 Frm 00015 Fmt 4702 Sfmt 4702 E:\FR\FM\19OCP1.SGM Chapter 04 of these documents— Bombardier Learjet 45 Maintenance Manual MM–104, Revision 53, dated January 10, 2011; or Bombardier Learjet 40 Maintenance Manual MM– 105, Revision 21, dated January 10, 2011; as applicable. Bombardier Learjet 45 Maintenance Manual MM–104, Revision 53, dated January 10, 2011; or Bombardier Learjet 40 Maintenance Manual MM– 105, Revision 21, dated January 10, 2011; as applicable. Bombardier Learjet 45 Maintenance Manual MM–104, Revision 53, dated January 10, 2011; or Bombardier Learjet 40 Maintenance Manual MM– 105, Revision 21, dated January 10, 2011; as applicable. Bombardier Learjet 45 Maintenance Manual MM–104, Revision 53, dated January 10, 2011; or Bombardier Learjet 40 Maintenance Manual MM– 105, Revision 21, dated January 10, 2011; as applicable. Bombardier Learjet 45 Maintenance Manual MM–104, Revision 53, dated January 10, 2011; or Bombardier Learjet 40 Maintenance Manual MM– 105, Revision 21, dated January 10, 2011; as applicable. Bombardier Learjet 45 Maintenance Manual MM–104, Revision 53, dated January 10, 2011; or Bombardier Learjet 40 Maintenance Manual MM– 105, Revision 21, dated January 10, 2011; as applicable. 19OCP1 64854 Federal Register / Vol. 76, No. 202 / Wednesday, October 19, 2011 / Proposed Rules TABLE 1—IRN TASK REVISION—Continued Model— IRN #— Initial compliance time— Model 40, 45 ...... N3220103, N3220104, N3220105, and N3220106. Before the accumulation of 17,000 total landings on the component. Model 45 ............ N5710147, N5710171, and N5710173 .. Before the accumulation of 6,500 total flight hours. Model 45 ............ N5710175 ............................................... Before the accumulation of 6,900 total flight hours. Model 45 ............ N5710177 ............................................... Before the accumulation of 7,000 total flight hours. No Alternative Intervals (h) After accomplishing the revisions required by paragraphs (g) of this AD, no alternative IRN task or IRN task interval may be used unless the IRN task or IRN task interval is approved as an AMOC in accordance with the procedures specified in paragraph (i)(1) of this AD. Chapter 04 of these documents— Bombardier Learjet 45 Maintenance Manual MM–104, Revision 53, dated January 10, 2011; or Bombardier Learjet 40 Maintenance Manual MM– 105, Revision 21, dated January 10, 2011; as applicable. Bombardier Learjet 45 Maintenance Manual MM–104, Revision 53, dated January 10, 2011. Bombardier Learjet 45 Maintenance Manual MM–104, Revision 53, dated January 10, 2011. Bombardier Learjet 45 Maintenance Manual MM–104, Revision 53, dated January 10, 2011. Issued in Renton, Washington, on October 5, 2011. Ali Bahrami, Manager, Transport Airplane Directorate, Aircraft Certification Service. management issue shows two categories of scenarios that could lead to thrust asymmetry during landing with controllability and deceleration consequences [.] [FR Doc. 2011–27010 Filed 10–18–11; 8:45 am] These thrust asymmetry conditions, if not corrected, could result in loss of control of the aeroplane during landing. BILLING CODE 4910–13–P * * * * * Alternative Methods of Compliance (AMOCs) DEPARTMENT OF TRANSPORTATION (i)(1) The Manager, Wichita Aircraft Certification Office (ACO), FAA, has the authority to approve AMOCs for this AD, if requested using the procedures found in 14 CFR 39.19. In accordance with 14 CFR 39.19, send your request to your principal inspector or local Flight Standards District Office, as appropriate. If sending information directly to the manager of the ACO, send it to the attention of the person identified in the Related Information section of this AD. (2) Before using any approved AMOC, notify your appropriate principal inspector, or lacking a principal inspector, the manager of the local flight standards district office/ certificate holding district office. Federal Aviation Administration * * * * * The proposed AD would require actions that are intended to address the unsafe condition described in the MCAI. 14 CFR Part 39 DATES: [Docket No. FAA–2011–1087; Directorate Identifier 2011–NM–032–AD] ADDRESSES: srobinson on DSK4SPTVN1PROD with PROPOSALS (j) For more information about this AD, contact William Griffith, Aerospace Engineer, Airframe Branch, ACE–118W, FAA, Wichita Aircraft Certification Office, 1801 Airport Road, Room 100, Mid-Continent Airport, Wichita, Kansas 67209; phone: 316–946– 4116; fax: 316–946–4107; e-mail: William.E.Griffith@faa.gov. (k) For service information identified in this AD, contact Learjet, Inc., One Learjet Way, Wichita, Kansas 67209–2942; telephone 316–946–2000; fax 316–946–2220; e-mail ac.ict@aero.bombardier.com; Internet http:// www.bombardier.com. You may review copies of the referenced service information at the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington. For information on the availability of this material at the FAA, call 425–227–1221. 16:22 Oct 18, 2011 RIN 2120–AA64 Airworthiness Directives; Airbus Model A318, A319, A320, and A321 Series Airplanes Federal Aviation Administration (FAA), DOT. ACTION: Notice of proposed rulemaking (NPRM). AGENCY: We propose to adopt a new airworthiness directive (AD) for the products listed above that would supersede two existing ADs. 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: SUMMARY: Related Information VerDate Mar<15>2010 We must receive comments on this proposed AD by December 5, 2011. Jkt 226001 Following in-service experience, analyses of the failure to follow procedure or heed existing cockpit cues were conducted to assess the consequences of mismanagement of thrust levers during landing. The investigation results identified the need for improvements in the identification of throttle mis-positioning and so providing further opportunity for the flight crew to identify an incorrect thrust lever configuration and to correct this. * * * In addition, the analysis of the thrust lever PO 00000 Frm 00016 Fmt 4702 Sfmt 4702 You may send comments by any of the following methods: • Federal eRulemaking Portal: Go to http://www.regulations.gov. Follow the instructions for submitting comments. • Fax: (202) 493–2251. • Mail: U.S. Department of Transportation, Docket Operations, M–30, West Building Ground Floor, Room W12–140, 1200 New Jersey Avenue, SE., Washington, DC 20590. • Hand Delivery: U.S. Department of Transportation, Docket Operations, M–30, West Building Ground Floor, Room W12–140, 1200 New Jersey Avenue, SE., Washington, DC, between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. For service information identified in this proposed AD, contact Airbus, Airworthiness Office—EAS, 1 Rond Point Maurice Bellonte, 31707 Blagnac Cedex, France; telephone +33 5 61 93 36 96; fax +33 5 61 93 44 51; e-mail: account.airworth-eas@airbus.com; Internet http://www.airbus.com. You may review copies of the referenced service information at the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington. For information on the availability of this material at the FAA, call 425–227– 1221. E:\FR\FM\19OCP1.SGM 19OCP1

Agencies

[Federal Register Volume 76, Number 202 (Wednesday, October 19, 2011)]
[Proposed Rules]
[Pages 64851-64854]
From the Federal Register Online via the Government Printing Office [www.gpo.gov]
[FR Doc No: 2011-27010]


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

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2011-1069; Directorate Identifier 2011-NM-025-AD]
RIN 2120-AA64


Airworthiness Directives; Learjet Inc. Model 45 Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Notice of proposed rulemaking (NPRM).

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

SUMMARY: We propose to adopt a new airworthiness directive (AD) for the 
products listed above. This proposed AD would require revising the 
maintenance program to include new or more restrictive life-limits and 
inspections. This proposed AD was prompted by changes to the 
Airworthiness Limitations Section (ALS) of the maintenance manual, 
which adds life-limits, revises life-limits, or adds inspections not 
previously identified. We are proposing this AD to limit exposure of 
flight critical components to corrosion, cracking, or failure due to 
life-limits, which if not corrected, could result in loss of roll 
control, fatigue cracking, or loss of structural components.

DATES: We must receive comments on this proposed AD by December 5, 
2011.

ADDRESSES: You may send comments by any of the following methods:
     Federal eRulemaking Portal: Go to http://www.regulations.gov. Follow the instructions for submitting comments.
     Fax: 202-493-2251.
     Mail: U.S. Department of Transportation, Docket 
Operations, M-30, West Building Ground Floor, Room W12-140, 1200 New 
Jersey Avenue, SE., Washington, DC 20590.
     Hand Delivery: Deliver to Mail address above between 9 
a.m. and 5 p.m., Monday through Friday, except Federal holidays.
    For service information identified in this proposed AD, contact 
Learjet, Inc., One Learjet Way, Wichita, Kansas 67209-2942; phone 316-
946-2000; fax 316-946-2220; e-mail ac.ict@aero.bombardier.com; Internet

[[Page 64852]]

http://www.bombardier.com. You may review copies of the referenced 
service information at the FAA, Transport Airplane Directorate, 1601 
Lind Avenue, SW., Renton, Washington. For information on the 
availability of this material at the FAA, call 425-227-1221.

Examining the AD Docket

    You may examine the AD docket on the Internet at http://www.regulations.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 (phone: 800-647-5527) is in the ADDRESSES 
section. Comments will be available in the AD docket shortly after 
receipt.

FOR FURTHER INFORMATION CONTACT: William Griffith, Aerospace Engineer, 
Airframe Branch, ACE-118W, FAA, Wichita Aircraft Certification Office, 
1801 Airport Road, Room 100, Mid-Continent Airport, Wichita, Kansas 
67209; phone: 316-946-4116; fax: 316-946-4107; e-mail: 
William.E.Griffith@faa.gov.

SUPPLEMENTARY INFORMATION:

Comments Invited

    We invite you to send any written relevant data, views, or 
arguments about this proposal. Send your comments to an address listed 
under the ADDRESSES section. Include ``Docket No. FAA-2011-1069; 
Directorate Identifier 2011-NM-025-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 http://www.regulations.gov, including any personal information you provide. We 
will also post a report summarizing each substantive verbal contact we 
receive about this proposed AD.

Discussion

    We have reviewed the design approval holder's changes to the ALS of 
the maintenance manual, which adds life-limits, revises life-limits, or 
adds inspections not previously identified. These changes resulted from 
the design holder's analysis, testing, and in-service history of 
certain components. We are proposing this AD to limit exposure of 
flight critical components to corrosion, cracking, or failure due to 
life-limits, which if not corrected, could result in loss of roll 
control, fatigue cracking, or loss of structural components. The 
corrective action is revising the maintenance program.

Relevant Service Information

    We reviewed Chapter 04, Airworthiness Limitations, of the 
Bombardier Learjet 45 Maintenance Manual MM-104, Revision 53, dated 
January 10, 2011; and Bombardier Learjet 40 Maintenance Manual MM-105, 
Revision 21, dated January 10, 2011. This service information describes 
component and system checks and replacements and includes new or 
revised life-limits and new inspections.

FAA's Determination

    We are proposing this AD because we evaluated all the relevant 
information and determined the unsafe condition described previously is 
likely to exist or develop in other products of the same type design.

Proposed AD Requirements

    This proposed AD would require accomplishing the actions specified 
in the service information described previously.

Costs of Compliance

    We estimate that this proposed AD affects 336 of U.S. registry.
    We estimate the following costs to comply with this proposed AD:

                                                 Estimated Costs
----------------------------------------------------------------------------------------------------------------
                                                                                    Cost per       Cost on U.S.
               Action                        Labor cost           Parts cost        product         operators
----------------------------------------------------------------------------------------------------------------
Change ALS in maintenance manual....  1 work-hour x $85 per                $0              $85          $28,560
                                       hour = $85.
----------------------------------------------------------------------------------------------------------------

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 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 this 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),
    (3) Will not affect intrastate aviation in Alaska, and
    (4) 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.

List of Subjects in 14 CFR Part 39

    Air transportation, Aircraft, Aviation safety, Incorporation by 
reference, 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:


[[Page 64853]]


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


Sec.  39.13  [Amended]

    2. The FAA amends Sec.  39.13 by adding the following new 
airworthiness directive (AD):

Learjet Inc.: Docket No. FAA-2011-1069; Directorate Identifier 2011-
NM-025-AD.

Comments Due Date

    (a) We must receive comments by December 5, 2011.

Affected ADs

    (b) None

Applicability

    (c) This AD applies to all Learjet Inc. Model 45 airplanes, 
certificated in any category.

    Note 1: This AD requires revisions to certain operator 
maintenance documents to include new actions (e.g. inspections). 
Compliance with these actions is required by 14 CFR 91.403(c). For 
airplanes that have been previously modified, altered, or repaired 
in the areas addressed by these actions, the operator may not be 
able to accomplish the inspections described in the revisions. In 
this situation, to comply with 14 CFR 91.403(c), the operator must 
request approval for an alternative method of compliance according 
to paragraph (i) of this AD. The request should include a 
description of changes to the required actions that will ensure the 
continued operational safety of the airplane. The FAA has provided 
guidance for this determination in Advisory Circular (AC) 25.1529-
1A.

Subject

    (d) Joint Aircraft System Component (JASC)/Air Transport 
Association (ATA) of America Code 05: Periodic Inspections.

Unsafe Condition

    (e) This AD was prompted by changes to the Airworthiness 
Limitations Section (ALS) of the maintenance manual (MM), which adds 
life-limits, revises life-limits, or adds inspections not previously 
identified. We are issuing this AD to limit exposure of flight 
critical components to corrosion, cracking, or failure due to life-
limits, which if not corrected, could result in loss of roll 
control, fatigue cracking, or loss of structural components.

Compliance

    (f) Comply with this AD within the compliance times specified, 
unless already done.

Maintenance Program Revision

    (g) Within 90 days after the effective date of this AD, revise 
the maintenance program by incorporating the applicable inspection 
reference number (IRN) tasks identified in table 1 of this AD as 
specified in Chapter 04, Airworthiness Limitations, of the 
Bombardier Learjet 45 Maintenance Manual MM-104, Revision 53, dated 
January 10, 2011; or Bombardier Learjet 40 Maintenance Manual MM-
105, Revision 21, dated January 10, 2011; as applicable. The initial 
task compliance time is within 90 days after the effective date of 
this AD, or the applicable initial compliance time specified in 
Table 1 of this AD, whichever is later.

    Note 2:  IRN  R2710041 shown in table 1 of this AD is 
identified as IRN  N2710041 in prior revisions of 
Bombardier Learjet 45 Maintenance Manual MM-104; and Bombardier 
Learjet 40 Maintenance Manual MM-105.


                       Table 1--IRN Task Revision
------------------------------------------------------------------------
                                            Initial       Chapter 04 of
       Model--         IRN --     compliance         these
                                             time--        documents--
------------------------------------------------------------------------
Model 40, 45.........  R2710041.......  Within 10 years  Bombardier
                                         after the date   Learjet 45
                                         of issuance of   Maintenance
                                         the original     Manual MM-104,
                                         standard         Revision 53,
                                         airworthiness    dated January
                                         certificate or   10, 2011; or
                                         the date of      Bombardier
                                         issuance of      Learjet 40
                                         the original     Maintenance
                                         export           Manual MM-105,
                                         certificate of   Revision 21,
                                         airworthiness,   dated January
                                         or within 10     10, 2011; as
                                         years after      applicable.
                                         the most
                                         recent
                                         replacement,
                                         whichever
                                         occurs later.
Model 40, 45.........  Q5510091.......  Within 600       Bombardier
                                         flight hours     Learjet 45
                                         after the most   Maintenance
                                         recent           Manual MM-104,
                                         inspection       Revision 53,
                                         done in          dated January
                                         accordance       10, 2011; or
                                         with IRN         Bombardier
                                                 Learjet 40
                                         Q5510091.        Maintenance
                                                          Manual MM-105,
                                                          Revision 21,
                                                          dated January
                                                          10, 2011; as
                                                          applicable.
Model 40, 45.........  Q5530011.......  Before the       Bombardier
                                         accumulation     Learjet 45
                                         of 9,600 total   Maintenance
                                         flight hours.    Manual MM-104,
                                                          Revision 53,
                                                          dated January
                                                          10, 2011; or
                                                          Bombardier
                                                          Learjet 40
                                                          Maintenance
                                                          Manual MM-105,
                                                          Revision 21,
                                                          dated January
                                                          10, 2011; as
                                                          applicable.
Model 40, 45.........  P3220007.......  Within 48        Bombardier
                                         months after     Learjet 45
                                         the most         Maintenance
                                         recent           Manual MM-104,
                                         inspection       Revision 53,
                                         done in          dated January
                                         accordance       10, 2011; or
                                         with IRN         Bombardier
                                                 Learjet 40
                                         P3220007.        Maintenance
                                                          Manual MM-105,
                                                          Revision 21,
                                                          dated January
                                                          10, 2011; as
                                                          applicable.
Model 40, 45.........  P3220146.......  Before the       Bombardier
                                         accumulation     Learjet 45
                                         of 4,800 total   Maintenance
                                         landings.        Manual MM-104,
                                                          Revision 53,
                                                          dated January
                                                          10, 2011; or
                                                          Bombardier
                                                          Learjet 40
                                                          Maintenance
                                                          Manual MM-105,
                                                          Revision 21,
                                                          dated January
                                                          10, 2011; as
                                                          applicable.
Model 40, 45.........  N3220012,        Before the       Bombardier
                        N3220023,        accumulation     Learjet 45
                        N3220035,        of 10,000        Maintenance
                        N3220036, and    total landings   Manual MM-104,
                        N3220037.        on the           Revision 53,
                                         component.       dated January
                                                          10, 2011; or
                                                          Bombardier
                                                          Learjet 40
                                                          Maintenance
                                                          Manual MM-105,
                                                          Revision 21,
                                                          dated January
                                                          10, 2011; as
                                                          applicable.

[[Page 64854]]

 
Model 40, 45.........  N3220103,        Before the       Bombardier
                        N3220104,        accumulation     Learjet 45
                        N3220105, and    of 17,000        Maintenance
                        N3220106.        total landings   Manual MM-104,
                                         on the           Revision 53,
                                         component.       dated January
                                                          10, 2011; or
                                                          Bombardier
                                                          Learjet 40
                                                          Maintenance
                                                          Manual MM-105,
                                                          Revision 21,
                                                          dated January
                                                          10, 2011; as
                                                          applicable.
Model 45.............  N5710147,        Before the       Bombardier
                        N5710171, and    accumulation     Learjet 45
                        N5710173.        of 6,500 total   Maintenance
                                         flight hours.    Manual MM-104,
                                                          Revision 53,
                                                          dated January
                                                          10, 2011.
Model 45.............  N5710175.......  Before the       Bombardier
                                         accumulation     Learjet 45
                                         of 6,900 total   Maintenance
                                         flight hours.    Manual MM-104,
                                                          Revision 53,
                                                          dated January
                                                          10, 2011.
Model 45.............  N5710177.......  Before the       Bombardier
                                         accumulation     Learjet 45
                                         of 7,000 total   Maintenance
                                         flight hours.    Manual MM-104,
                                                          Revision 53,
                                                          dated January
                                                          10, 2011.
------------------------------------------------------------------------

No Alternative Intervals

    (h) After accomplishing the revisions required by paragraphs (g) 
of this AD, no alternative IRN task or IRN task interval may be used 
unless the IRN task or IRN task interval is approved as an AMOC in 
accordance with the procedures specified in paragraph (i)(1) of this 
AD.

Alternative Methods of Compliance (AMOCs)

    (i)(1) The Manager, Wichita Aircraft Certification Office (ACO), 
FAA, has the authority to approve AMOCs for this AD, if requested 
using the procedures found in 14 CFR 39.19. In accordance with 14 
CFR 39.19, send your request to your principal inspector or local 
Flight Standards District Office, as appropriate. If sending 
information directly to the manager of the ACO, send it to the 
attention of the person identified in the Related Information 
section of this AD.
    (2) Before using any approved AMOC, notify your appropriate 
principal inspector, or lacking a principal inspector, the manager 
of the local flight standards district office/certificate holding 
district office.

Related Information

    (j) For more information about this AD, contact William 
Griffith, Aerospace Engineer, Airframe Branch, ACE-118W, FAA, 
Wichita Aircraft Certification Office, 1801 Airport Road, Room 100, 
Mid-Continent Airport, Wichita, Kansas 67209; phone: 316-946-4116; 
fax: 316-946-4107; e-mail: William.E.Griffith@faa.gov.
    (k) For service information identified in this AD, contact 
Learjet, Inc., One Learjet Way, Wichita, Kansas 67209-2942; 
telephone 316-946-2000; fax 316-946-2220; e-mail 
ac.ict@aero.bombardier.com; Internet http://www.bombardier.com. You 
may review copies of the referenced service information at the FAA, 
Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, 
Washington. For information on the availability of this material at 
the FAA, call 425-227-1221.

    Issued in Renton, Washington, on October 5, 2011.
Ali Bahrami,
Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. 2011-27010 Filed 10-18-11; 8:45 am]
BILLING CODE 4910-13-P