# Airworthiness Directives; Learjet Inc. Airplanes
> **Rule** · Final rule. · Published 2015-06-16 · Effective 2015-07-21 · 80 FR 34258
## Document
- **Document number:** 2015-14396
- **Category:** airworthiness
- **Manufacturer:** Learjet Inc.
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 80 FR 34258
- **Publication date:** 2015-06-16
- **Effective date:** 2015-07-21
- **FAA docket:** Docket No. FAA-2014-0249
## Abstract

We are adopting a new airworthiness directive (AD) for certain Learjet Inc. Model 45 airplanes. This AD was prompted by reports of non-conforming windshield supports (coupe rails). This AD requires a general visual inspection of the coupe rails 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 issuing this AD to detect and correct non-conforming windshield supports, which could result in uncontrolled cabin depressurization and compromise of the capability of the windshield to withstand a bird strike.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2015/06/16/2015-14396/airworthiness-directives-learjet-inc-airplanes)
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