# Proposed AD 2001-SW-59-AD: Sikorsky Aircraft Corporation Model S-76A, S-76B and S-76C Helicopters

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2002-21-07
- Products: Sikorsky
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: June 20, 2002, 67 FR 41875
- Comments due: August 19, 2002
- Became: [AD 2002-21-07](https://openairdocs.org/ad/2002-21-07)
- Docket: 2001-SW-59-AD
- FR document: 02-15551
- Official PDF: https://openairdocs.org/files/sha256/88/47/8847613359845d1e352c7ab656b776091e921db592ee6d871a078fb2207eae86 (from https://www.govinfo.gov/content/pkg/FR-2002-06-20/pdf/02-15551.pdf)
- Federal Register: https://www.federalregister.gov/documents/2002/06/20/02-15551/airworthiness-directives-sikorsky-aircraft-corporation-model-s-76a-s-76b-and-s-76c-helicopters
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/BF846E2C84B0ED4386256BDE004AB462.0001
- Page: https://openairdocs.org/proposed/2001-SW-59-AD

## Summary

This document proposes the adoption of a new airworthiness directive (AD) for Sikorsky Aircraft Corporation Model S-76A, S-76B and S-76C helicopters. The AD would require removing and inspecting each main rotor spindle attachment bolt (bolt) to ensure that the correct bolts are installed. This proposal is prompted by the discovery of improper bolts installed on a helicopter during its production. The actions specified by the proposed AD are intended to detect installation of incorrect bolts, which could result in reduced hub or bolt fatigue life, separation of the main rotor blade at the spindle attachment, and subsequent loss of control of the helicopter.

## Notices in this docket

- Jun 20, 2002: Notice of proposed rulemaking (NPRM). (first notice), FR document 02-15551, comments due Aug 19, 2002 (https://www.federalregister.gov/documents/2002/06/20/02-15551/airworthiness-directives-sikorsky-aircraft-corporation-model-s-76a-s-76b-and-s-76c-helicopters)

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