# Proposed AD FAA-2021-0658: Bombardier, Inc., Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2021-25-07
- Products: Bombardier
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: August 12, 2021, 86 FR 44314
- Comments due: September 27, 2021
- Became: [AD 2021-25-07](https://openairdocs.org/ad/2021-25-07)
- Docket: FAA-2021-0658 (https://www.regulations.gov/docket/FAA-2021-0658, where comments are filed)
- Project: MCAI-2020-01582-T
- FR document: 2021-16938
- Official PDF: https://openairdocs.org/files/sha256/f0/03/f003c86216c2741d73ac74aeb0096bfc5d3f244c2352c4c8d70622b58452914f (from https://www.govinfo.gov/content/pkg/FR-2021-08-12/pdf/2021-16938.pdf)
- Federal Register: https://www.federalregister.gov/documents/2021/08/12/2021-16938/airworthiness-directives-bombardier-inc-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/428AF8B1E216F98B8625872F00777153.0001
- Page: https://openairdocs.org/proposed/FAA-2021-0658

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for certain Bombardier, Inc., Model BD-100-1A10 airplanes. This proposed AD was prompted by a discovery that a lockwire may not have been installed on the side stay actuator pin nut of the main landing gear (MLG). This proposed AD would require inspecting the left-hand and right-hand MLG side stay actuator assembly pin nut for the presence of a lockwire, and installing a lockwire if necessary. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Aug 12, 2021: Notice of proposed rulemaking (NPRM). (first notice), FR document 2021-16938, comments due Sep 27, 2021 (https://www.federalregister.gov/documents/2021/08/12/2021-16938/airworthiness-directives-bombardier-inc-airplanes)

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