# Airworthiness Directives; Learjet Model 45 Airplanes
> **Rule** · Final rule; request for comments. · Published 2003-08-13 · Effective 2003-08-13 · 68 FR 48274
## Document
- **Document number:** 03-20699
- **Category:** airworthiness
- **Manufacturer:** Learjet Model 45
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 68 FR 48274
- **Publication date:** 2003-08-13
- **Effective date:** 2003-08-13
- **FAA docket:** Docket No. 2003-NM-142-AD
## Abstract

This amendment adopts a new airworthiness directive (AD) that is applicable to all Learjet Model 45 airplanes. This action requires replacement of the horizontal stabilizer actuator assembly (HSAA) with a new HSAA. This action is necessary to prevent structural failure of the HSAA, which could result in possible loss of control of the airplane. This action is intended to address the identified unsafe condition.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2003/08/13/03-20699/airworthiness-directives-learjet-model-45-airplanes)
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