# Proposed AD 2001-NM-366-AD: Learjet Model 31, 31A, 35, 35A (C-21A), 36, and 36A Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2004-03-08
- Products: Learjet
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: November 13, 2003, 68 FR 64283
- Comments due: December 29, 2003
- Became: [AD 2004-03-08](https://openairdocs.org/ad/2004-03-08)
- Docket: 2001-NM-366-AD
- FR document: 03-28399
- Official PDF: https://openairdocs.org/files/sha256/32/df/32dff91c3804045cbb7c25d03840a0c7ed2c45aff0d5a6be9c35e084935deacf (from https://www.govinfo.gov/content/pkg/FR-2003-11-13/pdf/03-28399.pdf)
- Federal Register: https://www.federalregister.gov/documents/2003/11/13/03-28399/airworthiness-directives-learjet-model-31-31a-35-35a-c-21a-36-and-36a-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/9A640004C9FE0C3686256DDD00613687.0001
- Page: https://openairdocs.org/proposed/2001-NM-366-AD

## Summary

This document proposes the adoption of a new airworthiness directive (AD) that is applicable to certain Learjet Model 31, 31A, 35, 35A (C-21A), 36, and 36A airplanes. This proposal would require modification of the drag angles of the fuselage and engine pylons to gain access to the shear webs of the forward engine beams; repetitive inspections of the shear webs of the forward engine beams for cracks; follow-on actions; and modification/repair of the shear webs of the forward engine beams, as necessary, which would terminate the repetitive inspections. This action is necessary to prevent significant structural damage to the engine pylons, possible separation of the engines from the fuselage, and consequent reduced controllability of the airplane. This action is intended to address the identified unsafe condition.

## Notices in this docket

- Nov 13, 2003: Notice of proposed rulemaking (NPRM). (first notice), FR document 03-28399, comments due Dec 29, 2003 (https://www.federalregister.gov/documents/2003/11/13/03-28399/airworthiness-directives-learjet-model-31-31a-35-35a-c-21a-36-and-36a-airplanes)

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