# Airworthiness Directives; Sikorsky Aircraft Corp. Model S76A, B, and C Helicopters
> **Rule** · Final rule; request for comments. · Published 1999-09-17 · Effective 1999-10-04 · 64 FR 50442
## Document
- **Document number:** 99-23959
- **Category:** airworthiness
- **Manufacturer:** Sikorsky
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 64 FR 50442
- **Publication date:** 1999-09-17
- **Effective date:** 1999-10-04
- **FAA docket:** Docket No. 99-SW-44-AD
## Abstract

This amendment adopts a new airworthiness directive (AD) applicable to Sikorsky Aircraft Corporation (Sikorsky) Model S-76A, B, and C helicopters. This action requires conducting a visual inspection to detect disbonding of the attachment angle between the tail gearbox forward fairing (fairing) and the pylon and replacing or repairing the attachment angles as necessary. This amendment is prompted by incidents, two in flight and eight on the ground, of fairing bonding failures. The actions specified in this AD are intended to prevent separation of the fairing, damage to the tail rotor blades, and subsequent loss of control of the helicopter.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1999/09/17/99-23959/airworthiness-directives-sikorsky-aircraft-corp-model-s76a-b-and-c-helicopters)
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