# Proposed AD 99-SW-05-AD: Eurocopter Deutschland GmbH (Eurocopter) Model EC 135 Helicopters

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2000-10-07
- Action: Notice of proposed rulemaking (NPRM).
- Published: February 11, 2000, 65 FR 6925
- Comments due: April 11, 2000
- Became: [AD 2000-10-07](https://openairdocs.org/ad/2000-10-07)
- Docket: 99-SW-05-AD
- FR document: 00-3224
- Official PDF: https://openairdocs.org/files/sha256/e6/d9/e6d90c930c2883f57e8a82ff0d02550f961df751cbbff3b2ae9b5fa239fc2588 (from https://www.govinfo.gov/content/pkg/FR-2000-02-11/pdf/00-3224.pdf)
- Federal Register: https://www.federalregister.gov/documents/2000/02/11/00-3224/airworthiness-directives-eurocopter-deutschland-gmbh-eurocopter-model-ec-135-helicopters
- Page: https://openairdocs.org/proposed/99-SW-05-AD

## Summary

This document proposes the adoption of a new airworthiness directive (AD) that is applicable to Eurocopter Model EC 135 helicopters. This proposal would require replacing a certain oil cooler fan splined drive shaft (shaft) with a different airworthy shaft and re-identifying the part numbers on the oil cooler fans. This proposal is prompted by two incidents in which the shaft broke. The actions specified by the proposed AD are intended to prevent failure of the shaft, loss of oil cooling, and a subsequent engine shutdown during flight.

## Notices in this docket

- Feb 11, 2000: Notice of proposed rulemaking (NPRM). (first notice), FR document 00-3224, comments due Apr 11, 2000 (https://www.federalregister.gov/documents/2000/02/11/00-3224/airworthiness-directives-eurocopter-deutschland-gmbh-eurocopter-model-ec-135-helicopters)

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