# Proposed AD FAA-2014-0010: Learjet Inc. Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2014-13-06
- Products: Learjet
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: February 10, 2014, 79 FR 7601
- Comments due: March 27, 2014
- Became: [AD 2014-13-06](https://openairdocs.org/ad/2014-13-06)
- Docket: FAA-2014-0010 (https://www.regulations.gov/docket/FAA-2014-0010, where comments are filed)
- Project: 2012-NM-218-AD
- FR document: 2014-02715
- Official PDF: https://openairdocs.org/files/sha256/18/a8/18a8be699b3a99c47c276d50435209124e176d63ee39aa99ba9739ea2245e94c (from https://www.govinfo.gov/content/pkg/FR-2014-02-10/pdf/2014-02715.pdf)
- Federal Register: https://www.federalregister.gov/documents/2014/02/10/2014-02715/airworthiness-directives-learjet-inc-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/DC92C754B7211B5E86257C7B004DF93E.0001
- Page: https://openairdocs.org/proposed/FAA-2014-0010

## Summary

We propose to adopt a new airworthiness directive (AD) for certain Learjet Inc. Model 45 airplanes. This proposed AD was prompted by a report of two cases of premature corrosion found on the structural support flange for the engine thrust reverser. This proposed AD would require doing a fluorescent penetrant inspection of the metallic components of the thrust reverser's attach flange for any corrosion; inspecting the thrust reverser flange for damage to the sealant, as applicable; installing sealants and gaskets, as applicable, to the thrust reverser flanges and service island flanges; and related investigative and corrective actions as necessary. We are proposing this AD to prevent failure of the thrust reverser structural support, which could result in departure of the thrust reverser from the engine that could subsequently result in damage to the adjacent support structure and engine controls, airframe structure, and control surfaces. Departing thrust reversers could also result in injury to persons on the ground.

## Notices in this docket

- Feb 10, 2014: Notice of proposed rulemaking (NPRM). (first notice), FR document 2014-02715, comments due Mar 27, 2014 (https://www.federalregister.gov/documents/2014/02/10/2014-02715/airworthiness-directives-learjet-inc-airplanes)

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