# Airworthiness Directives; Learjet Model 45 Airplanes
> **Rule** · Final rule; request for comments. · Published 2001-02-15 · Effective 2001-02-20 · 66 FR 10353
## Document
- **Document number:** 01-3671
- **Category:** airworthiness
- **Manufacturer:** Learjet Model 45
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 66 FR 10353
- **Publication date:** 2001-02-15
- **Effective date:** 2001-02-20
- **FAA docket:** Docket No. 2001-NM-11-AD
## Abstract

This amendment adopts a new airworthiness directive (AD) that is applicable to certain Learjet Model 45 airplanes. This action requires revising the airplane flight manual (AFM) to prohibit flight into known icing conditions; inspecting the anti-ice manifold assembly for missing material, and performing corrective actions if necessary; replacing the anti-ice manifold assembly with a new assembly, which terminates the AFM revision requirement; and revising the Learjet 45 maintenance program to incorporate additional inspections and maintenance practices for the anti-ice manifold assembly. This action is necessary to prevent metal fragments from breaking off the anti-ice manifold assembly due to fatigue, which could block a duct in the anti- ice system and result in an unannunciated loss of ice protection. This action is intended to address the identified unsafe condition.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2001/02/15/01-3671/airworthiness-directives-learjet-model-45-airplanes)
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