# Proposed AD FAA-2011-0651: Learjet Inc. Model 45 Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2011-25-03
- Products: Learjet
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: July 8, 2011, 76 FR 40291
- Comments due: August 22, 2011
- Became: [AD 2011-25-03](https://openairdocs.org/ad/2011-25-03)
- Docket: FAA-2011-0651 (https://www.regulations.gov/docket/FAA-2011-0651, where comments are filed)
- Project: 2011-NM-041-AD
- FR document: 2011-17265
- Official PDF: https://openairdocs.org/files/sha256/02/24/0224d3dcd33498edcbcfd66a65c94aa6940853a72e31d80449635d1827e54abd (from https://www.govinfo.gov/content/pkg/FR-2011-07-08/pdf/2011-17265.pdf)
- Federal Register: https://www.federalregister.gov/documents/2011/07/08/2011-17265/airworthiness-directives-learjet-inc-model-45-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/2B8CDE0D8C03BB9E862578C7004B514F.0001
- Page: https://openairdocs.org/proposed/FAA-2011-0651

## Summary

We propose to adopt a new airworthiness directive (AD) for the products listed above. This proposed AD would require revising the maintenance program to incorporate life limits for the main landing gear (MLG) actuator end cap. This proposed AD was prompted by a report of the potential for fatigue cracking of the end cap of the MLG prior to the published life limitation. We are proposing this AD to prevent fatigue cracking of the end cap of the MLG, which could result in the failure of the MLG actuator upon landing, and failure of the MLG to extend or retract during flight.

## Notices in this docket

- Jul 8, 2011: Notice of proposed rulemaking (NPRM). (first notice), FR document 2011-17265, comments due Aug 22, 2011 (https://www.federalregister.gov/documents/2011/07/08/2011-17265/airworthiness-directives-learjet-inc-model-45-airplanes)

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.