# Proposed AD FAA-2021-0255: The Boeing Company Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Withdrawn
- Products: Boeing
- Product type: Aircraft
- Action: Proposed rule; withdrawal.
- Published: September 9, 2021, 86 FR 50484
- Comments due: April 6, 2021
- Docket: FAA-2021-0255 (https://www.regulations.gov/docket/FAA-2021-0255, where comments are filed)
- Project: AD-2020-01282-T
- FR document: 2021-19355
- Official PDF: https://openairdocs.org/files/sha256/72/4d/724d5c64480a60e480c5407b19a5c6f35e9276f5e5fdaffce5111e6601843418 (from https://www.govinfo.gov/content/pkg/FR-2021-09-09/pdf/2021-19355.pdf)
- Federal Register: https://www.federalregister.gov/documents/2021/09/09/2021-19355/airworthiness-directives-the-boeing-company-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/A79C068D599FE1568625874C0052CFBC.0001
- Page: https://openairdocs.org/proposed/FAA-2021-0255

## Summary

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 787-8, 787-9, and 787- 10 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 Accordingly, the NPRM is withdrawn.

## Notices in this docket

- Apr 7, 2021: Notice of proposed rulemaking (NPRM). (first notice), FR document 2021-07164, comments due May 24, 2021 (https://www.federalregister.gov/documents/2021/04/07/2021-07164/airworthiness-directives-the-boeing-company-airplanes)
- Sep 9, 2021: Proposed rule; withdrawal., FR document 2021-19355, comments due Apr 6, 2021 (https://www.federalregister.gov/documents/2021/09/09/2021-19355/airworthiness-directives-the-boeing-company-airplanes)

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