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Federal Register / Vol. 86, No. 94 / Tuesday, May 18, 2021 / Rules and Regulations
board individuals who are not wearing a mask and make best efforts to disembark those who refuse to comply as soon as practicable; and 4 report incidents of non-compliance to TSA.
Consistent with the CDC Order, the SDs and EA permit limited exemptions from the requirement to wear a mask in the transportation system, and do not preempt state or local requirements that are the same or more protective of public health than TSAs mandatory measures.

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TSA has broad authority to issue orders, regulations, and directives related to all forms of transportation including air transportation, as well as separate authority specific to aviation, including operators of aircrafts and airports.6 The TSOBa body consisting of the heads of various interested Cabinet agencies, or their designees, and a representative of the National Security Councilreviews TSA regulations and security directives consistent with law.7
The chairman of the TSOB 8 convened the Board for review of TSA SDs 1542
2101 and 15442102 and EA 1546
2101.9
Following its review, on April 20, 2021, the TSOB ratified the SDs and EA.
As part of this ratification, the TSOB
also ratified any extension of the SDs and EA for a period no longer than the period of time that the Acting Secretarys national emergency determination and the CDC Order remain in effect should the TSA
Administrator determine that such an extension is warranted to support implementation of the Executive Order, the national emergency determination, and the CDC order.

6 See 49 U.S.C. 114, 44902, and 44903; see 49 CFR
1542.303, 1544.305, and 1546.105.
7 See, e.g., 49 U.S.C. 115.
8 The Deputy Secretary of Homeland Security serves as chairman of the TSOB. DHS Delegation No. 7071.1, Delegation to the Deputy Secretary to Chair the Transportation Security Oversight Board Apr. 2, 2007. The Deputy Secretary position is currently vacant and the duties of the position, including service as chairman of the TSOB, are being temporarily performed by senior DHS official David P. Pekoske.
9 The TSOB previously reviewed and ratified TSAs SD regarding mandatory mask measures in the surface transportation sector. See 86 FR 13971
published Mar. 12, 2021 regarding notification of TSOB ratification of TSA security directive 1582/
842101.

15:42 May 17, 2021

David P. Pekoske, Senior Official Performing the Duties of Deputy Secretary of Homeland Security &
Chairman of the Transportation Security Oversight Board, U.S. Department of Homeland Security.
FR Doc. 202110433 Filed 51721; 8:45 am BILLING CODE 91109MP

DEPARTMENT OF TRANSPORTATION

II. TSOB Ratification
VerDate Sep<11>2014

The SDs and EA are available in the docket for this notice at https
www.regulations.gov/.

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Federal Aviation Administration 14 CFR Part 39
Docket No. FAA20210270; Project Identifier AD202100352T; Amendment 3921508; AD 20210814
RIN 2120AA64

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

The FAA is adopting a new airworthiness directive AD for all The Boeing Company Model 737300, 400, and 500 series airplanes. This AD was prompted by a flap synchro wire failure that may go undetected by the autothrottle A/T computer. This AD
requires repetitive BITE built-in test equipment tests of the A/T computer to detect a flap synchro wire failure, and corrective action if necessary. The FAA
is issuing this AD to address the unsafe condition on these products.
DATES: This AD is effective June 2, 2021.
The Director of the Federal Register approved the incorporation by reference of a certain publication listed in this AD
as of June 2, 2021.
The FAA must receive comments on this AD by July 2, 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, M30, 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.
SUMMARY:

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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
0270.
Examining the AD Docket You may examine the AD docket at https www.regulations.gov by searching for and locating Docket No.
FAA20210270; 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 the Docket Operations is listed above.
FOR FURTHER INFORMATION CONTACT:
Jeffrey Palmer, Aerospace Engineer, Systems and Equipment Section, FAA, Los Angeles ACO Branch, 3960
Paramount Boulevard, Lakewood, CA
907124137; phone: 5626275351;
email: Jeffrey.W.Palmer@faa.gov.
SUPPLEMENTARY INFORMATION:
Background The FAA previously issued AD 2000
2334, Amendment 3912007 65 FR
75595, December 4, 2000 AD 200023
34, which applies to all Boeing Model 737300, 400, and 500 series airplanes, and requires replacing the existing A/T computer with a new, improved A/T computer that included an asymmetric cruise thrust monitor.
On January 9, 2021, a Model 737500
series airplane operated by Sriwijaya Air was involved in an accident on a flight from Jakarta, Indonesia. There were 62 fatalities. During the ongoing accident investigation, Boeing reported that a flap synchro wire failure may go undetected by the A/T computer on the affected airplanes. Further investigation has revealed that the design update for the A/T computer required by AD 2000
2334 does not properly account for a possible latent failure of the flap position sensor, which is one data component needed to provide the logic necessary for the asymmetric cruise thrust monitor to operate. Failure of the asymmetric cruise thrust monitor to engage during a large thrust asymmetry
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