# Proposed AD FAA-2014-0249: Learjet Inc. Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2015-12-06
- Products: Learjet
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: April 16, 2014, 79 FR 21416
- Comments due: June 2, 2014
- Became: [AD 2015-12-06](https://openairdocs.org/ad/2015-12-06)
- Docket: FAA-2014-0249 (https://www.regulations.gov/docket/FAA-2014-0249, where comments are filed)
- Project: 2012-NM-211-AD
- FR document: 2014-08605
- Official PDF: https://openairdocs.org/files/sha256/fa/5a/fa5aa98aa1ec99df1f1757afe51450e50f89ca1606bfffa87b4e41544c811bde (from https://www.govinfo.gov/content/pkg/FR-2014-04-16/pdf/2014-08605.pdf)
- Federal Register: https://www.federalregister.gov/documents/2014/04/16/2014-08605/airworthiness-directives-learjet-inc-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/0BCF3BF7197355E086257CBC0049D9DE.0001
- Page: https://openairdocs.org/proposed/FAA-2014-0249

## Summary

We propose to adopt a new airworthiness directive (AD) for certain Learjet Inc. Model 45 airplanes. This proposed AD was prompted by reports of non-conforming windshield supports (coupe rails). This proposed AD would require a general visual inspection to detect gouging and scratches and to determine if a radius has been removed; an ultrasound inspection to measure the dimensions of the lower coupe rails; an eddy current inspection to detect cracks of the lower coupe rails; replacement of the lower coupe rails if necessary; and revision of the maintenance or inspection program, as applicable. We are proposing this AD to detect and correct non-conforming windshield supports, which could result in uncontrolled cabin depressurization. Non-conforming windshield supports could also compromise the capability of the windshield to withstand a bird strike.

## Notices in this docket

- Apr 16, 2014: Notice of proposed rulemaking (NPRM). (first notice), FR document 2014-08605, comments due Jun 2, 2014 (https://www.federalregister.gov/documents/2014/04/16/2014-08605/airworthiness-directives-learjet-inc-airplanes)

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