# Proposed AD 99-SW-37-AD: Sikorsky Aircraft Corporation (Sikorsky) Model S-76A Helicopters

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2000-12-09
- Action: Notice of proposed rulemaking (NPRM).
- Published: March 22, 2000, 65 FR 15280
- Comments due: May 22, 2000
- Became: [AD 2000-12-09](https://openairdocs.org/ad/2000-12-09)
- Docket: 99-SW-37-AD
- FR document: 00-7112
- Official PDF: https://openairdocs.org/files/sha256/03/f3/03f3ec6eefcedffc896d4e345f8e75fd819801137bc5ccfc0d996d9a810038de (from https://www.govinfo.gov/content/pkg/FR-2000-03-22/pdf/00-7112.pdf)
- Federal Register: https://www.federalregister.gov/documents/2000/03/22/00-7112/airworthiness-directives-sikorsky-aircraft-corporation-sikorsky-model-s-76a-helicopters
- Page: https://openairdocs.org/proposed/99-SW-37-AD

## Summary

This document proposes adopting a new airworthiness directive (AD) applicable to Sikorsky Model S-76A helicopters. The AD would require inspecting at specified intervals until installing a soft-start assembly retrofit kit on the air conditioning system to prevent a continuous flow of current through the soft-start resistor. This proposal is prompted by a report of overheating of the soft-start assembly. The actions specified by the proposed AD are intended to prevent overheating of the air conditioning soft-start assembly, damage in the lower tailcone, an electrical fire, and subsequent loss of control of the helicopter.

## Notices in this docket

- Mar 22, 2000: Notice of proposed rulemaking (NPRM). (first notice), FR document 00-7112, comments due May 22, 2000 (https://www.federalregister.gov/documents/2000/03/22/00-7112/airworthiness-directives-sikorsky-aircraft-corporation-sikorsky-model-s-76a-helicopters)

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