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Federal Register / Vol. 86, No. 231 / Monday, December 6, 2021 / Rules and Regulations
AD if it is approved by a Learjet Inc.
Designated Engineering Representative, or a Unit Member of the Learjet Organization Designation Authorization, that has been authorized by the Manager, Wichita ACO
Branch, to make those findings. To be approved, the repair, modification, or alteration method must meet the certification basis of the airplane, and the approval must specifically refer to this AD.

DEPARTMENT OF TRANSPORTATION

m Related Information
Airworthiness Directives; The Boeing Company Airplanes
For more information about this AD, contact Tara Shawn, Aviation Safety Engineer, Wichita ACO Branch, FAA, 1801
Airport Road, Wichita, KS 67209; phone:
316 9464141; fax: 316 9464107; email:
tara.shawn@faa.gov.
n Material Incorporated by Reference
khammond on DSKJM1Z7X2PROD with RULES

1 The Director of the Federal Register approved the incorporation by reference IBR 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 Bombardier Learjet 40 Service Bulletin 405706, Revision 1, dated October, 26, 2020.
ii Bombardier Learjet 45 Service Bulletin 455713, Revision 1, dated October, 26, 2020.
iii Bombardier Learjet 70 Service Bulletin 705702, Revision 1, dated October, 26, 2020.
iv Bombardier Learjet 75 Service Bulletin 755701, Revision 2, dated April 19, 2021.
3 For service information identified in this AD, contact Learjet Inc., One Learjet Way, Wichita, KS 67209; phone: 316 946
2000; email: ac.ict@aero.bombardier.com;
website: businessaircraft.bombardier.com/
en/aircraft/learjet.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 28, 2021.
Lance T. Gant, Director, Compliance & Airworthiness Division, Aircraft Certification Service.
FR Doc. 202126330 Filed 12321; 8:45 am BILLING CODE 491013P

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Federal Aviation Administration 14 CFR Part 39
Docket No. FAA20210332; Project Identifier AD202001414T; Amendment 3921819; AD 20212320
RIN 2120AA64

Federal Aviation Administration FAA, DOT.
ACTION: Final rule.
AGENCY:

The FAA is adopting a new airworthiness directive AD for certain The Boeing Company Model 7878 and 7879 airplanes. This AD was prompted by reports that shimming requirements were not met during the assembly of certain structural joints, which can result in reduced fatigue thresholds of the affected structural joints. This AD
requires repetitive inspections for cracking of certain areas of the front spar pickle fork and front spar outer chord and repair of any cracking found.
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 Boeing Commercial Airplanes, Attention: Contractual & Data Services C&DS, 2600 Westminster Blvd., MC
110SK57, Seal Beach, CA 907405600;
telephone 5627971717; internet https www.myboeingfleet.com. You may view this service information at the FAA, Airworthiness Products Section, Operational Safety Branch, 2200 South 216th St., Des Moines, WA. For information on the availability of this material at the FAA, call 2062313195.
It is also available at https
www.regulations.gov by searching for and locating Docket No. FAA2021
0332.
SUMMARY:

Examining the AD Docket You may examine the AD docket at https www.regulations.gov by searching for and locating Docket No.
FAA20210332; 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
PO 00000

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Fmt 4700

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Transportation, Docket Operations, M
30, West Building Ground Floor, Room W12140, 1200 New Jersey Avenue SE, Washington, DC 20590.
FOR FURTHER INFORMATION CONTACT: Greg Rutar, Aerospace Engineer, Airframe Section, FAA, Seattle ACO Branch, 2200
South 216th St., Des Moines, WA 98198;
phone and fax: 2062313529; email:
Greg.Rutar@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 The Boeing Company Model 7878 and 7879 airplanes. The NPRM published in the Federal Register on May 7, 2021 86 FR 24551.
The NPRM was prompted by reports that shimming requirements were not met during the assembly of certain structural joints, which can result in reduced fatigue thresholds of the affected structural joints. In the NPRM, the FAA proposed to require repetitive inspections for cracking of certain areas of the front spar pickle fork and front spar outer chord and repair of any cracking found. The FAA is issuing this AD to address undetected fatigue cracking, which could weaken primary structure so it cannot sustain limit load, and could result in reduced structural integrity of the airplane.
Discussion of Final Airworthiness Directive Comments The FAA received comments from American Airlines AAL who supported the NPRM.
The FAA received additional comments from four commenters, including Boeing, United Airlines UAL, Avianca Airlines AVA, and AAL. The following presents the comments received on the NPRM and the FAAs response to each comment.
Request To Clarify Applicability Boeing asked that the applicability specified in paragraph c of the proposed AD be clarified, as follows:
This AD applies to The Boeing Company Model 7878 and 7879
airplanes, certificated in any category, as identified in Boeing Alert Requirements Bulletins B78781205
SB53007500 RB and B78781205
SB53007600 RB, both Issue 001, both dated September 8, 2020. Boeing stated that, although the applicability is the same in each bulletin, identifying both will avoid confusion for operators.
The FAA agrees with the commenter for the reason provided. Paragraph c of
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