# Proposed AD FAA-2023-0436: The Boeing Company Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2023-21-09
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: April 6, 2023, 88 FR 20433
- Comments due: May 22, 2023
- Became: [AD 2023-21-09](https://openairdocs.org/ad/2023-21-09)
- Docket: FAA-2023-0436 (https://www.regulations.gov/docket/FAA-2023-0436, where comments are filed)
- Project: AD-2022-00395-T
- FR document: 2023-07011
- Official PDF: https://openairdocs.org/files/sha256/36/36/3636939aa801631be463c35af5a6f74c9c3b58ea233ac55d28da62d2eb026498 (from https://www.govinfo.gov/content/pkg/FR-2023-04-06/pdf/2023-07011.pdf)
- Federal Register: https://www.federalregister.gov/documents/2023/04/06/2023-07011/airworthiness-directives-the-boeing-company-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/FR-ADNPRM-2023-07011-00000000000.0001
- Page: https://openairdocs.org/proposed/FAA-2023-0436

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for all The Boeing Company Model 777-200, 777-200LR, 777-300, 777- 300ER, and 777F series airplanes. This proposed AD was prompted by a report of a ''FLAPS DRIVE'' caution message in flight due to the torque trip indicator of the No. 2 trailing edge (TE) flap transmission assembly being in the set position, which resulted in an air turn-back. This proposed AD would require an inspection or records review to determine the serial numbers of the TE flap transmission and gearbox assemblies, and applicable on-condition corrective actions. This proposed AD would also limit the installation of affected parts. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Apr 6, 2023: Notice of proposed rulemaking (NPRM). (first notice), FR document 2023-07011, comments due May 22, 2023 (https://www.federalregister.gov/documents/2023/04/06/2023-07011/airworthiness-directives-the-boeing-company-airplanes)

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