# Airworthiness Directives; Boeing Vertol Model 107-II Helicopters
> **Rule** · Final rule; request for comments. · Published 2005-11-23 · Effective 2005-12-08 · 70 FR 70718
## Document
- **Document number:** 05-23156
- **Category:** airworthiness
- **Manufacturer:** Boeing Vertol Model 107-II
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 70 FR 70718
- **Publication date:** 2005-11-23
- **Effective date:** 2005-12-08
- **FAA docket:** Docket No. FAA-2005-23085
## Abstract

This amendment adopts a new airworthiness directive (AD) for Boeing Vertol (Boeing) Model 107-II helicopters. This action requires a visual and magnetic particle inspection of the quill shaft. This amendment is prompted by the discovery of cracks in a quill shaft during a routine inspection. The actions specified in this AD are intended to detect a fatigue crack in a quill shaft and prevent separation of the quill shaft between the aft transmission and the mix box assembly, loss of rotor synchronization, and subsequent loss of control of the helicopter.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2005/11/23/05-23156/airworthiness-directives-boeing-vertol-model-107-ii-helicopters)
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