# Proposed AD 95-SW-34-AD: Sikorsky Aircraft-Manufactured Model S- 64F Helicopters

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 97-10-15
- Action: Notice of proposed rulemaking (NPRM).
- Published: October 11, 1996, 61 FR 53337
- Comments due: December 10, 1996
- Became: [AD 97-10-15](https://openairdocs.org/ad/97-10-15)
- Docket: 95-SW-34-AD
- FR document: 96-26128
- Official PDF: https://openairdocs.org/files/sha256/7c/9c/7c9ce6579e76aaf5ce01f83f6164560f9e2565aa31b2f9b4dbe30f81e76b0bc2 (from https://www.govinfo.gov/content/pkg/FR-1996-10-11/pdf/96-26128.pdf)
- Federal Register: https://www.federalregister.gov/documents/1996/10/11/96-26128/airworthiness-directives-sikorsky-aircraft-manufactured-model-s--64f-helicopters
- Page: https://openairdocs.org/proposed/95-SW-34-AD

## Summary

This document proposes the adoption of a new airworthiness directive (AD) that is applicable to Sikorsky Aircraft-manufactured S- 64F helicopters. This proposal would require inspections, and replacement, if necessary, of the main gearbox second stage lower planetary plate (plate). This proposal is prompted by two incidents in which the second stage planetary plate was found cracked. The actions specified by the proposed AD are intended to prevent failure of the plate due to fatigue cracking, which could lead to failure of the main gearbox and subsequent loss of control of the helicopter.

## Notices in this docket

- Oct 11, 1996: Notice of proposed rulemaking (NPRM). (first notice), FR document 96-26128, comments due Dec 10, 1996 (https://www.federalregister.gov/documents/1996/10/11/96-26128/airworthiness-directives-sikorsky-aircraft-manufactured-model-s--64f-helicopters)

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