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Federal Register / Vol. 86, No. 231 / Monday, December 6, 2021 / Rules and Regulations following the Accomplishment Instructions, Part A or Part AA, in ASI Aviation Service Bulletin No. F406104, Revision 1, dated December 14, 2018.
2 Within 100 hours TIS after the effective date of this AD, and thereafter at intervals not to exceed 2,400 hours TIS, do a magnetic particle inspection for cracks of the LH and RH rudder control pedal torque tubes by following the Accomplishment Instructions, Part B, in ASI Aviation Service Bulletin No.
F406104, Revision 1, dated December 14, 2018.
3 If, during any inspection required by paragraph h1 or 2 of this AD, any crack is detected on a rudder control pedal torque tube, you are not required to contact ASI
Aviation as specified in steps A.16, AA.5, and B.4 of ASI Aviation Service Bulletin No.
F406104, Revision 1, dated December 14, 2018. Instead, before further flight, replace the rudder control pedal torque tube with a serviceable part as defined by this AD.
i Installation Limitation As of the effective date of this AD, do not install a rudder control pedal torque tube P/
N 51152601 LH or P/N 51152602 RH on any airplane unless it is a serviceable part as defined by this AD.
j Alternative Methods of Compliance AMOCs 1 The Manager, International Validation Branch, 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 certification office, send it to the attention of the person identified in paragraph k1 of this AD or email: 9-AVS-AIR-730-AMOC@
faa.gov.
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.

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k Related Information 1 For more information about this AD, contact Gregory Johnson, Aviation Safety Engineer, International Validation Section, FAA, 901 Locust, Room 301, Kansas City, MO 641062641; phone: 720 6265462;
email: gregory.johnson@faa.gov.
2 Refer to European Aviation Safety Agency EASA AD 20190016, dated January 29, 2019, for more information. You may examine the EASA AD in the AD docket at https www.regulations.gov by searching for and locating Docket No. FAA20210712.
l Material Incorporated by Reference 1 The Director of the Federal Register approved the incorporation by reference of the service information listed in this paragraph under 5 U.S.C. 552a and 1 CFR
part 51.
2 You must use this service information as applicable to do the actions required by this AD, unless the AD specifies otherwise.
i ASI Aviation Service Bulletin No. F406
104, Revision 1, dated December 14, 2018.
ii Reserved.

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3 For service information identified in this AD, contact ASI Aviation, Aerodrome de Reims Prunay, 51360 Prunay, France;
telephone: +33 3 26 48 46 84; fax: +33 3 26
49 18 57; email: contact@asi-aviation.fr;
website: https asi-aviation.fr/pageAccueil.html.
4 You may view this service information at FAA, Airworthiness Products Section, Operational Safety Branch, 901 Locust, Kansas City, MO 64106. For information on the availability of this material at the FAA, call 816 3294148.
5 You may view this service information that is incorporated by reference at the National Archives and Records Administration NARA. For information on the availability of this material at NARA, email: fr.inspection@nara.gov, or go to:
https www.archives.gov/federal-register/cfr/
ibr-locations.html.
Issued on October 27, 2021.
Lance T. Gant, Director, Compliance & Airworthiness Division, Aircraft Certification Service.
FR Doc. 202126329 Filed 12321; 8:45 am BILLING CODE 491013P

DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration 14 CFR Part 39
Docket No. FAA20210157; Project Identifier AD202000483T; Amendment 3921806; AD 20212308
RIN 2120AA64

Airworthiness Directives; Learjet Inc.
Airplanes Federal Aviation Administration FAA, DOT.
ACTION: Final rule.
AGENCY:

The FAA is adopting a new airworthiness directive AD for certain Learjet Inc. Learjet Model 45 airplanes.
This AD was prompted by reports of corrosion found on the upper surface of the lower center wing mid spar splice plate. This AD requires repetitively inspecting the center wing area for corrosion and deterioration of protective treatments, removing any corrosion, and treating any deteriorated areas. The FAA
is issuing this AD to address the unsafe condition on these products.
DATES: This AD is effective January 10, 2022.
The Director of the Federal Register approved the incorporation by reference of certain publications listed in this AD
as of January 10, 2022.
ADDRESSES: For service information identified in this final rule, contact Learjet Inc., One Learjet Way, Wichita, KS 67209; phone: 316 9462000;
email: ac.ict@aero.bombardier.com;
SUMMARY:

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website: https businessaircraft.
bombardier.com/en/aircraft/
learjet.html. You may view this referenced service information at the FAA, Airworthiness Products Section, Operational Safety Branch, 901 Locust, Kansas City, MO 64106. For information on the availability of this material at the FAA, call 816 3294148.
Examining the AD Docket You may examine the AD docket at https www.regulations.gov by searching for and locating Docket No.
FAA20210157; or in person at Docket Operations between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. The AD docket contains this final rule, any comments received, and other information. The address for Docket Operations is U.S. Department of Transportation, Docket Operations, M
30, West Building Ground Floor, Room W12140, 1200 New Jersey Avenue SE, Washington, DC 20590.
FOR FURTHER INFORMATION CONTACT: Tara Shawn, Aviation Safety Engineer, Wichita ACO Branch, FAA, 1801
Airport Road, Wichita, KS 67209;
phone: 316 9464141; fax: 316 946
4107; email: tara.shawn@faa.gov.
SUPPLEMENTARY INFORMATION:
Background The FAA issued a notice of proposed rulemaking NPRM to amend 14 CFR
part 39 by adding an AD that would apply to certain serial numbered Learjet Inc. Learjet Model 45 Learjet 40, Model 45 Learjet 45, Model 45 Learjet 70, and Model 45 Learjet 75 airplanes.
The NPRM published in the Federal Register on July 28, 2021 86 FR 40379.
The NPRM was prompted by a report from Learjet of corrosion found in the center wing area of a Model 45 Learjet 45 airplane. Exfoliating corrosion was found on the upper surface of the lower center wing mid spar splice plate during unrelated maintenance. The corrosion appeared to extend half way through the thickness of the splice plate. Since the initial report, the FAA has received 23
additional reports of corrosion from Learjet.
The FAA determined areas of the wing center section are not sealed against the elements; in addition, the fuselage has drain holes that allow condensation to drain into the center wing. The accumulation and retention of moisture in the center wing section may lead to corrosion. In the NPRM, the FAA proposed to require repetitively inspecting the center wing area for corrosion and deterioration of protective treatments, removing any corrosion, and treating any deteriorated areas. This
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