# Proposed AD 2003-SW-35-AD: Sikorsky Aircraft Corporation Model S-61L, S-61N, S-61-NM, and S-61R Helicopters

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2004-15-22
- Products: Sikorsky
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: November 24, 2003, 68 FR 65857
- Comments due: January 23, 2004
- Became: [AD 2004-15-22](https://openairdocs.org/ad/2004-15-22)
- Docket: 2003-SW-35-AD
- FR document: 03-29219
- Official PDF: https://openairdocs.org/files/sha256/28/e5/28e5249cb209d432d760d942da1d30b8ae1b1aa404c993b746d28581fa81d461 (from https://www.govinfo.gov/content/pkg/FR-2003-11-24/pdf/03-29219.pdf)
- Federal Register: https://www.federalregister.gov/documents/2003/11/24/03-29219/airworthiness-directives-sikorsky-aircraft-corporation-model-s-61l-s-61n-s-61-nm-and-s-61r
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/074D066D4CAE57DB86256DE80050D333.0001
- Page: https://openairdocs.org/proposed/2003-SW-35-AD

## Summary

This document proposes adopting a new airworthiness directive (AD) for the specified Sikorsky Aircraft Corporation (Sikorsky) model helicopters. The AD would require installing a Number 5 bearing chip detector in each engine, installing an on-board chip detector annunciation system, and revising the Rotorcraft Flight Manual (RFM) to add procedures for crew response to an on-board chip detector annunciation. This proposal is prompted by reports of the failure of the engine's Number 5 bearing that resulted in erratic movement of the high-speed engine-to-transmission shaft (shaft), oil leakage, an in-flight fire and an emergency landing. The actions specified by the proposed AD are intended to detect an impending engine bearing (bearing) failure and prevent a bearing failure, oil leakage, severing of the shaft housing, an uncontained in-flight fire, and a subsequent immediate emergency landing.

## Notices in this docket

- Nov 24, 2003: Notice of proposed rulemaking (NPRM). (first notice), FR document 03-29219, comments due Jan 23, 2004 (https://www.federalregister.gov/documents/2003/11/24/03-29219/airworthiness-directives-sikorsky-aircraft-corporation-model-s-61l-s-61n-s-61-nm-and-s-61r)

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