# Airworthiness Directives; Learjet Model 45 Airplanes
> **Rule** · Final rule. · Published 2008-01-10 · Effective 2008-02-14 · 73 FR 1815
## Document
- **Document number:** E8-163
- **Category:** airworthiness
- **Manufacturer:** Learjet Model 45
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 73 FR 1815
- **Publication date:** 2008-01-10
- **Effective date:** 2008-02-14
- **FAA docket:** Docket No. FAA-2006-25174
## Abstract

The FAA is adopting a new airworthiness directive (AD) for certain Learjet Model 45 airplanes. This AD requires revising the Airworthiness Limitations section of the airplane maintenance manual to incorporate certain inspections and compliance times to detect fatigue cracking of certain principal structural elements (PSEs). This AD results from new and more restrictive life limits and inspection intervals for certain PSEs. We are issuing this AD to ensure that fatigue cracking of various PSEs is detected and corrected; such fatigue cracking could adversely affect the structural integrity of these airplanes.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2008/01/10/E8-163/airworthiness-directives-learjet-model-45-airplanes)
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