# Proposed AD 2000-NM-132-AD: Learjet Model 45 Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2000-22-04
- Action: Notice of proposed rulemaking (NPRM).
- Published: June 27, 2000, 65 FR 39578
- Comments due: August 11, 2000
- Became: [AD 2000-22-04](https://openairdocs.org/ad/2000-22-04)
- Docket: 2000-NM-132-AD
- FR document: 00-16235
- Official PDF: https://openairdocs.org/files/sha256/d7/e1/d7e18487941ebd16f636ac2954d61b73fb65b7e1aac8e2492b0fc5541cfcb339 (from https://www.govinfo.gov/content/pkg/FR-2000-06-27/pdf/00-16235.pdf)
- Federal Register: https://www.federalregister.gov/documents/2000/06/27/00-16235/airworthiness-directives-learjet-model-45-series-airplanes
- Page: https://openairdocs.org/proposed/2000-NM-132-AD

## Summary

This document proposes the adoption of a new airworthiness directive (AD) that is applicable to certain Learjet Model 45 series airplanes. This proposal would require repetitive application of grease to the rotating disk assembly of the nose landing gear squat switch mechanism. Application of grease to the squat switch assembly is necessary to prevent moisture contamination and subsequent formation of ice. Such ice formation could result in bending or damaging of the nose landing gear squat switch assembly, which could drive the nose wheel to an uncommanded angle against the force of the steering system. This condition, if not corrected, could result in the airplane departing from the runway at high speeds during landing.

## Notices in this docket

- Jun 27, 2000: Notice of proposed rulemaking (NPRM). (first notice), FR document 00-16235, comments due Aug 11, 2000 (https://www.federalregister.gov/documents/2000/06/27/00-16235/airworthiness-directives-learjet-model-45-series-airplanes)

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.