# Proposed AD FAA-2021-0571: The Boeing Company Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2021-24-14
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: August 9, 2021, 86 FR 43443
- Comments due: September 23, 2021
- Became: [AD 2021-24-14](https://openairdocs.org/ad/2021-24-14)
- Docket: FAA-2021-0571 (https://www.regulations.gov/docket/FAA-2021-0571, where comments are filed)
- Project: AD-2021-00101-T
- FR document: 2021-16680
- Official PDF: https://openairdocs.org/files/sha256/a9/18/a918f04407ef9c2f2a9679adbdc1bc7c4db2c06049cb0268b372fc7828f1069b (from https://www.govinfo.gov/content/pkg/FR-2021-08-09/pdf/2021-16680.pdf)
- Federal Register: https://www.federalregister.gov/documents/2021/08/09/2021-16680/airworthiness-directives-the-boeing-company-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/7C2C9984789A26A68625872D00797591.0001
- Page: https://openairdocs.org/proposed/FAA-2021-0571

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for certain The Boeing Company Model 787-8, 787-9, and 787-10 airplanes. This proposed AD was prompted by reports of damage to the thrust reverser (TR) translating sleeve secondary sliders due to contact between the slider and the slider track liner. This damage was only found on TR sleeves installed on certain engines. This proposed AD would require determining the serial number of the TR and performing applicable on-condition actions; or replacing the TR with a serviceable TR. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Aug 9, 2021: Notice of proposed rulemaking (NPRM). (first notice), FR document 2021-16680, comments due Sep 23, 2021 (https://www.federalregister.gov/documents/2021/08/09/2021-16680/airworthiness-directives-the-boeing-company-airplanes)

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