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Rules and Regulations
Federal Register Vol. 86, No. 32
Friday, February 19, 2021

This section of the FEDERAL REGISTER
contains regulatory documents having general applicability and legal effect, most of which are keyed to and codified in the Code of Federal Regulations, which is published under 50 titles pursuant to 44 U.S.C. 1510.

Federal Aviation Administration FAA, DOT.
ACTION: Final rule; request for comments.

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
1176; 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 street address for Docket Operations is listed above.
FOR FURTHER INFORMATION CONTACT:
Brandon Lucero, Aerospace Engineer, Cabin Safety and Environmental Systems Section, FAA, Seattle ACO
Branch, 2200 South 216th St., Des Moines, WA 98198; phone and fax: 206
2313569; email: brandon.lucero@
faa.gov.
SUPPLEMENTARY INFORMATION:

The FAA is adopting a new airworthiness directive AD for certain The Boeing Company Model 7878, 7879, and 78710 airplanes. This AD
requires repetitive general visual inspections of the bilge barriers located in the forward and aft cargo compartments for disengaged or damaged decompression panels, reinstallation of disengaged but undamaged decompression panels, and replacement of damaged decompression panels. This AD was prompted by reports of multiple incidents of torn decompression panels being found in the bilge area. The FAA is issuing this AD to address the unsafe condition on these products.
DATES: This AD is effective March 8, 2021.
The FAA must receive comments on this AD by April 5, 2021.
ADDRESSES: You may send comments, using the procedures found in 14 CFR
11.43 and 11.45, by any of the following methods:
Federal eRulemaking Portal: Go to https www.regulations.gov. Follow the instructions for submitting comments.
Fax: 2024932251.
Mail: U.S. Department of Transportation, Docket Operations, M
30, West Building Ground Floor, Room W12140, 1200 New Jersey Avenue SE, Washington, DC 20590.

Background The FAA has received reports of multiple incidents of torn decompression panels being found in the bilge area. These torn decompression panels were found after accomplishment of the actions required by AD 20180506, Amendment 39
19215 83 FR 9688, March 7, 2018 AD
20180506, which requires repetitive inspections of the bilge barriers in the forward and aft cargo compartments for disengaged decompression panels;
reinstalling any disengaged panels; and replacing the decompression panels with new panels and straps. The torn decompression panels present a different unsafe condition than that addressed by AD 20180506, so the FAA is issuing this AD to address the new unsafe condition. In the event of a cargo fire, significant leakage in the bilge area could result in insufficient Halon concentrations to adequately control the fire. This condition, if not addressed, could result in the loss of continued safe flight and landing of the airplane.
In addition to this AD addressing a different unsafe condition than the one specified in AD 20180506, this AD
also includes models that are not affected by the unsafe condition specified in AD 20180506. Both ADs include reinstallation and replacement
The Code of Federal Regulations is sold by the Superintendent of Documents.

DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration 14 CFR Part 39
Docket No. FAA20201176; Project Identifier AD202001231T; Amendment 3921402; AD 20210219
RIN 2120AA64

Airworthiness Directives; The Boeing Company Airplanes AGENCY:

SUMMARY:

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actions as part of the required oncondition actions. AD 20180506
requires certain service information for the reinstallation and replacement instructions, which refer to airplane maintenance manual AMM
procedures. However, this AD requires using the operators maintenance or inspection program, as applicable, for the reinstallation and replacement instructions.
FAAs Determination The FAA is issuing this AD because the agency 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.
AD Requirements This AD requires repetitive inspections of the bilge barriers located in the forward and aft cargo compartments for disengaged or damaged torn decompression panels, reinstalling panels that are disengaged but undamaged, and replacing damaged panels.
Interim Action The FAA considers this AD interim action. The manufacturer is currently developing a modification that will address the unsafe condition identified in this AD. Once this modification is developed, approved, and available, the FAA might consider additional rulemaking.
FAAs Justification and Determination of the Effective Date An unsafe condition exists that requires the immediate adoption of this AD without providing an opportunity for public comments prior to adoption.
The FAA has found that the risk to the flying public justifies waiving notice and comment prior to adoption of this rule because, in the event of a cargo fire, significant leakage in the bilge area could result in insufficient Halon concentrations to adequately control the fire. This condition, if not addressed, could result in the loss of continued safe flight and landing. In addition, the compliance time for the required action is shorter than the time necessary for the public to comment and for publication of the final rule. Therefore, the FAA
finds good cause that notice and opportunity for prior public comment are impracticable. In addition, for the
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