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Federal Register / Vol. 86, No. 210 / Wednesday, November 3, 2021 / Rules and Regulations 2062313195. This material may be found in the AD docket on the internet at https
www.regulations.gov by searching for and locating Docket No. FAA20210372.
5 You may view this material that is incorporated by reference at the National Archives and Records Administration NARA. For information on the availability of this material at NARA, email fedreg.legal@
nara.gov, or go to: https www.archives.gov/
federal-register/cfr/ibr-locations.html.
Issued on July 30, 2021.
Lance T. Gant, Director, Compliance & Airworthiness Division, Aircraft Certification Service.
FR Doc. 202123870 Filed 11221; 8:45 am BILLING CODE 491013P

DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration 14 CFR Part 39
Docket No. FAA20201166; Project Identifier AD202000906T; Amendment 3921737; AD 20211919
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 certain The Boeing Company Model 7379
airplanes. This AD was prompted by a report of missing sealant on the left and right wing leading edge outboard blowout door. This AD requires doing a fluid seal contact inspection and a detailed inspection for missing sealant on each blowout door and applying sealant if necessary. The FAA is issuing this AD to address the unsafe condition on these products.
DATES: This AD is effective December 8, 2021.
The Director of the Federal Register approved the incorporation by reference of a certain publication listed in this AD
as of December 8, 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;
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.

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SUMMARY:

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It is also available at https
www.regulations.gov by searching for and locating Docket No. FAA2020
1166.
Examining the AD Docket You may examine the AD docket at https www.regulations.gov by searching for and locating Docket No.
FAA20201166; 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:
Chris Baker, Aerospace Engineer, Propulsion Section, FAA, Seattle ACO
Branch, 2200 South 216th St., Des Moines, WA 98198; phone and fax: 206
2313552; email: christopher.r.baker@
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 The Boeing Company Model 7379 airplanes having line numbers 6834, 6852, 6872, 6899, 6917, 6935, 7096, 7173, 7196, 7201, 7208, 7216, 7246, 7253, 7261, 7268, 7306, 7316, 7338, 7348, 7361, 7384, 7388, 7394, and 7428. The NPRM published in the Federal Register on January 21, 2021
86 FR 6269. The NPRM was prompted by a report indicating that the application of sealant on the left wing and right wing leading edge outboard blowout door was missed during the airplane manufacturing process on some Model 7379 airplanes. In the NPRM, the FAA proposed to require doing a fluid seal contact inspection and a detailed inspection for missing sealant on each blowout door and applying sealant if necessary. The FAA is issuing this AD to address the missing sealant, which is intended to act as a fuel barrier. In the presence of a substantial fuel leak from the wing box, the unintended drain path could allow fuel to come into contact with the engine.
This condition, if not addressed, could lead to a large ground fire.
Discussion of Final Airworthiness Directive Comments The FAA received comments from The Air Line Pilots Association, International ALPA, Boeing, and an
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individual, who all stated that they supported the NPRM without change.
The FAA also received comments from United Airlines UAL and two individuals. The following discussion presents those comments and the FAAs response.
Request To Use Alternative Products UAL suggested that the FAA work with Boeing on identifying acceptable alternatives to the developer specified in the service information. UAL stated that during initial accomplishment of the inspection there were difficulties sourcing the specified developer due to the requirement in Boeing Alert Requirements Bulletin 73757A1350 RB
to use the bulk material and not the aerosol spray. UAL stated it was ultimately able to procure the required bulk material.
The FAA disagrees with the request to change the AD to allow the use of alternative developers. Use of the bulk developer identified in Boeing Alert Requirements Bulletin 73757A1350
RB, dated April 23, 2020, is needed for effective inspection. The aerosol spray form of the developer penetrates more aggressively than the bulk form, so it could cause existing sealants to swell.
The use of bulk material avoids the potential for false readings of the gasket contact verification to be caused by sealant swelling.
The commenter also did not identify any alternative developers in either bulk or aerosol spray that would be an acceptable alternative to the developer identified in Boeing Alert Requirements Bulletin 73757A1350 RB, dated April 23, 2020. However, operators may submit an alternative method of compliance AMOC request using the procedures specified in paragraph i of this AD; the request should include data that substantiates the alternative developer will ensure an effective inspection to determine if additional sealant is required. The FAA has not changed this AD as a result of this comment.
Request for Information on the Approval Process for Alternative Materials Two individuals asked about the approval process for alternative suitable materials sealant and procedures. In addition, the individuals questioned the role of the Boeing Company Organization Designation Authorization ODA in the approval process.
In order to receive an AMOC to use an alternate sealant, the AMOC request would need to show that the alternate sealant meets or exceeds the performance or characteristics of the
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