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Federal Register / Vol. 86, No. 33 / Monday, February 22, 2021 / Rules and Regulations Subpart FFarm Loan Programs Debt Settlement 2. Amend 761.403 by revising paragraph c3 to read as follows:

761.403

General.

c
3 The debtors account is involved in a fiscal irregularity investigation in which final action has not been taken or the account shows evidence that a shortage may exist and an investigation will be requested.

Steven Peterson, Acting Administrator, Farm Service Agency.
FR Doc. 202103186 Filed 21921; 8:45 am BILLING CODE 341005P

DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration 14 CFR Part 39
Docket No. FAA20200459; Product Identifier 2020NM049AD; Amendment 3921380; AD 20210104
RIN 2120AA64

Airworthiness Directives; The Boeing Company Airplanes Federal Aviation Administration FAA, DOT.
ACTION: Final rule.
AGENCY:

The FAA is adopting a new airworthiness directive AD for all The Boeing Company Model 737 series airplanes, excluding Model 737100, 200, 200C, 300, 400, and 500
series airplanes. This AD was prompted by reports of cracked or completely severed lugs in the upper aft corner stop fitting assembly of the forward entry door. This AD requires an inspection, a measurement, or a records check of that assembly to determine the part number, and replacement if a certain part is found. The FAA is issuing this AD to address the unsafe condition on these products.

SUMMARY:

This AD is effective March 29, 2021.
The Director of the Federal Register approved the incorporation by reference of a certain publication listed in this AD
as of March 29, 2021.
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;

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DATES:

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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 on the internet at https www.regulations.gov by searching for and locating Docket No.
FAA20200459.

Discussion of Final Airworthiness Directive
Examining the AD Docket You may examine the AD docket on the internet at https
www.regulations.gov by searching for and locating Docket No. FAA2020
0459; 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:
Michael Bumbaugh, Aerospace Engineer, Airframe Section, FAA, Seattle ACO Branch, 2200 South 216th St., Des Moines, WA 98198; phone and fax: 2062313522; email:
michael.bumbaugh@faa.gov.
SUPPLEMENTARY INFORMATION:

Aviation Partners Boeing stated that the installation of winglets per Supplemental Type Certificate STC
ST00830SE does not affect compliance with the proposed actions.
The FAA agrees that the installation of winglets per STC ST00830SE would not affect the ability to replace the affected stop fitting assembly with a newly designed stop fitting assembly as required by this AD. Operators of airplanes with these winglets do not need to request a change in product alternative method of compliance AMOC approval as specified in 14 CFR
39.17. The FAA has redesignated paragraph c of the proposed AD as paragraph c1 of this AD, and added paragraph c2 accordingly.

Discussion The FAA issued a notice of proposed rulemaking NPRM to amend 14 CFR
part 39 by adding an AD that would apply to all The Boeing Company Model 737 series airplanes, excluding Model 737100, 200, 200C, 300, 400, and 500 series airplanes. The NPRM
published in the Federal Register on June 3, 2020 85 FR 34136. The NPRM
was prompted by reports of cracked or completely severed lugs in the upper aft corner stop fitting assembly of the forward entry door. Analysis of the design of the stop fitting assembly revealed that undersized wall thickness of the lug made it susceptible to fatigue cracking, which may result in the forward entry door being unable to sustain limit load. In the NPRM, the FAA proposed to require an inspection, a measurement, or a records check of that assembly to determine the part number, and replacement if a certain part-numbered assembly is installed.
The FAA is issuing this AD to address cracked or completely severed lugs, which could result in reduced structural integrity of the forward entry door and consequent rapid decompression of the airplane.

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Comments The FAA received comments from four commenters. The following presents the comments received on the NPRM and the FAAs response to each comment.
Effect of Winglets on Accomplishment of the Proposed Actions
Request for Compliance Actions at the Component Level Southwest Airlines SWA asked that the compliance actions be reported at the component level due to the interchangeability of the forward entry doors between the Model 737 NG and 737 MAX fleets.
The FAA infers that the commenter is requesting that the ADs applicability point towards the component parts, rather than the airplane. The FAA
acknowledges that the component most likely to be rotated is the forward entry door because doors are likely removed with the stop fittings intact. However, the FAA disagrees with changing the applicability of this AD because the unsafe condition is related to the stop fitting assembly and an affected stop fitting assembly may be installed on a forward entry door of any airplane identified in paragraph c of this AD. In addition, paragraph i of this AD, Parts Installation Prohibition, states that no person may install a forward entry door that has a stop fitting assembly with part number P/N 141A61043 on any airplane. The FAA used this language because doors are often rotated among aircraft with the stop fitting assembly already installed. The FAA has therefore determined that an airplane-level applicability is appropriate and has not changed this AD in this regard.

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