# Proposed AD FAA-2021-0457: The Boeing Company Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2022-02-14
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: June 30, 2021, 86 FR 34656
- Comments due: August 16, 2021
- Became: [AD 2022-02-14](https://openairdocs.org/ad/2022-02-14)
- Docket: FAA-2021-0457 (https://www.regulations.gov/docket/FAA-2021-0457, where comments are filed)
- Project: AD-2020-01461-T
- FR document: 2021-13932
- Official PDF: https://openairdocs.org/files/sha256/64/05/6405c192da36acbb28b81ec1b96375645c6152a5efc11c551a974118bf0f8b4e (from https://www.govinfo.gov/content/pkg/FR-2021-06-30/pdf/2021-13932.pdf)
- Federal Register: https://www.federalregister.gov/documents/2021/06/30/2021-13932/airworthiness-directives-the-boeing-company-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/9ED51CE95EE45BCF862587040051B1B3.0001
- Page: https://openairdocs.org/proposed/FAA-2021-0457

## 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 a report that during a fleet sampling inspection, cracks were found on the inner cylinder pivot pins of the left and right main landing gear (MLG) on one of the airplanes. This proposed AD would require repetitive lubrications of the left and right MLG truck beam and inner cylinder pivot joint, reviewing the maintenance program documentation to verify certain lubrication tasks are incorporated, doing repetitive inspections of the MLG inner cylinder pivot pins and inner cylinder bushings of the MLG truck beam and inner cylinder joint for any friction, heat damage, excessive wear, cracking and smearing of bushing material, and applicable on-condition actions. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Jun 30, 2021: Notice of proposed rulemaking (NPRM). (first notice), FR document 2021-13932, comments due Aug 16, 2021 (https://www.federalregister.gov/documents/2021/06/30/2021-13932/airworthiness-directives-the-boeing-company-airplanes)

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