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Federal Register / Vol. 86, No. 150 / Monday, August 9, 2021 / Rules and Regulations
note. Section 110.1b also issued under 22
U.S.C. 2403; 22 U.S.C. 2778a; 50 App. U.S.C.
2401 et seq.
110.2

Amended
50. In 110.2, in the definition for Special nuclear material, add a comma after uranium-233.

110.8

Amended
51. In 110.8h, remove MWe and add in its place MW.

110.20

Amended
52. In 110.20e, remove U.S.
Customs Services and add in its place U.S. Customs and Border Protections.

110.50

Amended
53. In 110.50c3 introductory text, remove the word stationary and add in its place the word stationery.

Dated: July 30, 2021.
Angella M. Love Blair, Acting Chief, Regulatory Analysis and Rulemaking Support Branch, Division of Rulemaking, Environmental, and Financial Support, Office of Nuclear Material Safety and Safeguards.

Examining the AD Docket
FR Doc. 202116662 Filed 8621; 8:45 am BILLING CODE 759001P

DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration 14 CFR Part 39
Docket No. FAA20210614; Project Identifier AD202100831T; Amendment 3921677; AD 20211615
RIN 2120AA64

Airworthiness Directives; The Boeing Company Airplanes
The FAA is adopting a new airworthiness directive AD for all The Boeing Company Model 7378, 7379, and 7378200 737 MAX airplanes; and certain Model 737800 and 737900ER
series airplanes. This AD was prompted by the determination that the aft cargo compartment fire suppression capability is reduced if the airplane is dispatched or released with failed electronic flow control of air conditioning packs, as is currently allowed by these airplane models master minimum equipment lists MMELs. This AD prohibits the carriage of cargo in the aft cargo compartment when the airplane is dispatched or released with failed
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You may examine the AD docket at https www.regulations.gov by searching for and locating Docket No.
FAA20210614; 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: Sam Nalbandian, Aerospace Engineer, Cabin Safety and Environmental Systems Section, FAA, Seattle ACO Branch, 2200
South 216th St., Des Moines, WA 98198;
phone and fax: 2062313993; email:
Samuel.K.Nalbandian@faa.gov.
SUPPLEMENTARY INFORMATION:
Background
Federal Aviation Administration FAA, DOT.
ACTION: Final rule; request for comments.
AGENCY:

SUMMARY:

electronic flow control of air conditioning packs. The FAA is issuing this AD to address the unsafe condition on these products.
DATES: This AD is effective August 9, 2021.
The FAA must receive comments on this AD by September 23, 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.
Hand Delivery: Deliver to Mail address above between 9 a.m. and 5
p.m., Monday through Friday, except Federal holidays.

The FAA was notified by Boeing in March 2021 of a potential concern that the aft cargo compartment fire suppression capability is reduced on affected airplanes if the airplane is dispatched or released with failed electronic flow control of air conditioning packs, as is currently allowed by the existing FAA-approved MMEL of the affected airplane models.
This MMEL allowance can result in the inability to contain a fire in the aft cargo compartment due to increased air leakage that degrades the fire suppression performance. A failed electronic flow control of air conditioning packs would significantly increase the pack airflow and cargo compartment air leakage. In April 2021, Boeing advised the FAA that such increased leakage could result in
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insufficient concentration of Halon fire suppressant in the aft cargo compartment, which can result in the inability to contain a fire for the time necessary to divert to a suitable airport.
The FAA is issuing this AD to address failed electronic flow control of air conditioning packs, which can result in an uncontained aft cargo compartment fire due to insufficient cargo fire suppression capability. The FAA is issuing this AD to address the unsafe condition on these products.
FAAs Determination The FAA is issuing this AD because the agency has determined the unsafe condition described previously is likely to exist or develop in other products of the same type design.
AD Requirements This AD prohibits dispatch or release of an airplane with cargo in the aft cargo compartment with failed electronic flow control of air conditioning packs. The AD specifically allows non-combustible and/or non-flammable empty cargo handling equipment, ballast, and/or flyaway kits in the aft cargo compartment.
MMEL Revisions This AD refers to items in ATA
System No. 21, Air Conditioning, of Boeing 737 B737100/200/300/400/
500/600/700/800/900/900ER MMEL, Revision 61, dated July 8, 2020; and Boeing 737 MAX B7378/8200/9
MMEL, Revision 3, dated April 12, 2021; 1 those items may also be included in an operators FAA-approved minimum equipment list MEL. This AD prohibits dispatch or release of the airplane under conditions currently allowed by those items in the MMEL.
The FAA plans to revise the MMELs to modify those items; operators would then be required to also revise their applicable existing FAA-approved MEL
accordingly.
Justification for Immediate Adoption and Determination of the Effective Date Section 553b3B of the Administrative Procedure Act APA 5
U.S.C. 551 et seq. authorizes agencies to dispense with notice and comment procedures for rules when the agency, for good cause, finds that those procedures are impracticable, unnecessary, or contrary to the public interest. Under this section, an agency, upon finding good cause, may issue a 1 The MMEL items can be found in the applicable FAA-approved MMEL, which can be found on the Flight Standards Information Management System FSIMS website, https fsims.faa.gov/
PICResults.aspx?mode=Publication&
doctype=MMELByModel.

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