# Proposed AD FAA-2021-0660: Learjet Inc. Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2021-23-11
- Products: Learjet
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: August 13, 2021, 86 FR 44660
- Comments due: September 27, 2021
- Became: [AD 2021-23-11](https://openairdocs.org/ad/2021-23-11)
- Docket: FAA-2021-0660 (https://www.regulations.gov/docket/FAA-2021-0660, where comments are filed)
- Project: AD-2021-00398-T
- FR document: 2021-17044
- Official PDF: https://openairdocs.org/files/sha256/7f/a8/7fa82db5d3ef8c6044cc5b4fffb0af3899d065f46557bf06229d8baa7d448e32 (from https://www.govinfo.gov/content/pkg/FR-2021-08-13/pdf/2021-17044.pdf)
- Federal Register: https://www.federalregister.gov/documents/2021/08/13/2021-17044/airworthiness-directives-learjet-inc-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/8496F56FA5784E5C862587300059DFDA.0001
- Page: https://openairdocs.org/proposed/FAA-2021-0660

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for certain Learjet Inc. Model 45 airplanes. This proposed AD was prompted by a report of a fuel leak due to a cracked fuel line between the engine fuel control and the engine fuel flow meter. This proposed AD would require replacing the existing fuel flow meter bracket assembly with a redesigned bracket assembly and reporting information to the FAA. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Aug 13, 2021: Notice of proposed rulemaking (NPRM). (first notice), FR document 2021-17044, comments due Sep 27, 2021 (https://www.federalregister.gov/documents/2021/08/13/2021-17044/airworthiness-directives-learjet-inc-airplanes)

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