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Proposed Rules
Federal Register Vol. 86, No. 172
Thursday, September 9, 2021

This section of the FEDERAL REGISTER
contains notices to the public of the proposed issuance of rules and regulations. The purpose of these notices is to give interested persons an opportunity to participate in the rule making prior to the adoption of the final rules.

DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration 14 CFR Part 39
Docket No. FAA20210255; Project Identifier AD202001282T

Background
RIN 2120AA64

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

The FAA is withdrawing a notice of proposed rulemaking NPRM
that proposed to adopt a new airworthiness directive AD that would have applied to certain The Boeing Company Model 7878, 7879, and 78710 airplanes. The NPRM was prompted by reports that very high frequency VHF radio frequencies transfer between the active and standby windows of the tuning control panel TCP without flightcrew input. The NPRM would have required updating the TCP operational software OPS and performing a software configuration check. Since issuance of the NPRM, the FAA determined that the TCP OPS
version specified in the NPRM does not correct the unsafe condition. The FAA
intends to propose new rulemaking to require updated software. Accordingly, the NPRM is withdrawn.
DATES: The FAA is withdrawing the proposed rule published on April 7, 2021 86 FR 17993 as of September 9, 2021.
ADDRESSES:

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SUMMARY:

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. FAA2021
0255; 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 AD action, any comments received, and other
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information. The street address for Docket Operations is U.S. Department of Transportation, Docket Operations, M30, West Building Ground Floor, Room W12140, 1200 New Jersey Avenue SE, Washington, DC 20590.
FOR FURTHER INFORMATION CONTACT:
Frank Carreras, Aerospace Engineer, Systems and Equipment Section, FAA, Seattle ACO Branch, 2200 South 216th St., Des Moines, WA 98198; phone and fax: 2062313539; email:
frank.carreras@faa.gov.
SUPPLEMENTARY INFORMATION:
The FAA issued an NPRM that proposed to amend 14 CFR part 39 by adding an AD that would apply to certain The Boeing Company Model 7878, 7879, and 78710 airplanes.
The NPRM was published in the Federal Register on April 7, 2021 86 FR
17993. The NPRM was prompted by reports that very high frequency VHF
radio frequencies transfer between the active and standby windows of the tuning control panel TCP without flightcrew input.
The NPRM proposed to require updating the TCP OPS and performing a software configuration check. The proposed actions were intended to address uncommanded frequency changes, which could result in missed air traffic control communications such as amended clearances and critical instructions for changes to flight path, and consequent loss of safe separation between aircraft, collision, or runway incursion.
Actions Since the NPRM Was Issued Since issuance of the NPRM the FAA
determined that the TCP OPS version specified in the NPRM does not correct the unsafe condition. The manufacturer is developing a new version of the software which will better address the unsafe condition. Required development and testing of the new software results in scheduled availability of the revised service information by June 2022. In light of these changes, the FAA intends to propose further rulemaking.
Withdrawal of the NPRM constitutes only such action. The withdrawal does not preclude the FAA from further rulemaking on this issue or commit the FAA to any course of action in the future.

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Comments The FAA received comments on the NPRM from three commenters. The following presents the comments received on the NPRM and the FAAs response to the comment.
Boeing asked that the FAA delay issuance of the final rule until the next TCP OPS revision. Boeing stated that based on additional fleet reports, it has concluded that the OPS version specified in Boeing Alert Requirements Bulletin B78781205SB23004100 RB, Issue 002, dated September 14, 2020, and specified in the NPRM, does not adequately address the TCP VHF
Uncommanded Frequency Change issue. Boeing is continuing to evaluate fleet reports and is will address the cause of the additional findings in the next TCP OPS revision. The FAA agrees that the NPRM will not address the unsafe condition. When appropriate service information is developed, approved, and available, the FAA
intends to propose new rulemaking to require the updated software.
American Airlines requested that the FAA revise paragraph g of the proposed AD to allow later FAAapproved software. The FAA agrees with the request, but because the FAA
is withdrawing the NPRM, the request is no longer necessary.
The Air Line Pilots Association ALPA supported the NPRM.
FAAs Conclusions Upon further consideration, the FAA
has determined that the NPRM does not adequately address the identified unsafe condition. Accordingly, the FAA is withdrawing the NPRM.
Regulatory Findings Since this action only withdraws an NPRM, it is neither a proposed nor a final rule. This action therefore is not covered under Executive Order 12866, the Regulatory Flexibility Act, or DOT
Regulatory Policies and Procedures 44
FR 11034, February 26, 1979.
List of Subjects in 14 CFR Part 39
Air transportation, Aircraft, Aviation safety, Incorporation by reference, Safety.
The Withdrawal Accordingly, the notice of proposed rulemaking NPRM Docket No. FAA
20210255, which was published in the

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