# Airworthiness Directives; Sikorsky Aircraft Corporation Model S-76A, S-76B, and S-76C Helicopters
> **Rule** · Final rule; request for comments. · Published 2001-01-18 · Effective 2001-02-02 · 66 FR 4654
## Document
- **Document number:** 01-1121
- **Category:** airworthiness
- **Manufacturer:** Sikorsky
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 66 FR 4654
- **Publication date:** 2001-01-18
- **Effective date:** 2001-02-02
- **FAA docket:** Docket No. 2000-SW-52-AD
## Abstract

This amendment adopts a new airworthiness directive (AD) for Sikorsky Aircraft Corporation (Sikorsky) Model S-76A, S-76B, and S-76C helicopters. This AD requires initial and repetitive inspections of the main landing gear positioning rod assembly (rod assembly) and the side brace rod end (rod end) for corrosion. If any corrosion is found, this AD requires replacing any part that is corroded with an airworthy part before further flight. This amendment is prompted by a landing gear collapse caused by corrosion due to dissimilar metals in the landing gear rod end. The actions specified in this AD are intended to detect corrosion of the threaded joint in the rod assembly to prevent a collapse of the landing gear, and subsequent loss of control of the helicopter during landing.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2001/01/18/01-1121/airworthiness-directives-sikorsky-aircraft-corporation-model-s-76a-s-76b-and-s-76c-helicopters)
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