# AD 76-09-05: Axial Compressor Wheel

- Type: Airworthiness directive
- Status: Current
- Products: Turbomeca Astazou II A and Astazou II A
- Effective: May 26, 1976
- Superseded by: Nothing supersedes this AD
- Product type: Engine
- Amendment: 39-2593
- Registered aircraft: 25 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/D5A046AC652AB27C8625682D0052199C.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/76-09-05

## The airworthiness directive

76-09-05 TURBOMECA: Amendment 39-2593. Applies to Turbomeca Astazou IIAd engines installed on, but not necessarily limited to, Aerospatiale Alouette II Models SA3180, SA318B, SA318C helicopters.

Compliance is required as indicated unless already accomplished.

To prevent axial compressor wheel failure due to corrosion and fatigue, accomplish the following:

  (a) Within the next 100 hours' time in service after the effective date of this AD, or before the accumulation of 1000 hours' time in service since new, whichever occurs later, remove the axial compressor wheels, P/Ns 0.236.15.014 Index A and 0.268.15.004, from the engine and inspect for a crack or evidence of corrosion.

  (b) If a crack is found, before returning the engine to service, comply with paragraph (d) of this AD.

  (c) If no crack is found but evidence of corrosion is found, before returning the engine to service, either -

  (1) Rework the wheel and reinstall in the engine in accordance with Turbomeca MOD TU 196 (Turbomeca Service Bulletin Astazou II, No. 72.205.0203, dated August 19, 1974), or an equivalent approved by the Chief, Aircraft Certification Staff, Europe, Africa, and Middle East, FAA, c/o American Embassy, APO New York 09667; or

  (2) Comply with paragraph (d) of this AD.

  (d) Replace the wheel with a new wheel, P/N 0.236.15.016, 0.268.15.011, or 0.268.15.010, modified in accordance with Turbomeca MOD TU 196 (Turbomeca Service Bulletin Astazou II, No. 72.205.0203, dated August 19, 1974), or an equivalent approved by the Chief, Aircraft Certification Staff, Europe, Africa, and Middle East, FAA, c/o American Embassy, APO New York 09667.

This amendment becomes effective May 26, 1976.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS E2IN](https://openairdocs.org/tcds/E2IN): Turbomeca S.A.; names 1 of 7 models: Astazou II A

## Registered aircraft it may apply to (OpenAirDocs)

Matched by airframe and engine model; the AD's applicability may narrow it by serial number, part number or equipment.

- Aircraft: 25 (0 by airframe model, 25 by engine model)
- Makers: Aerospatiale 10, Eurocopter 5, S N I A S 5, Sud 4, Westland Helicopters 1

Models with the most aircraft:

- [Turbomeca ASTAZOU series](https://openairdocs.org/engine/turbomeca-astazou-series): 17 aircraft (engine model)
- [Turbomeca ASTAZOU IIA](https://openairdocs.org/engine/turbomeca-astazou-iia): 8 aircraft (engine model)

All 2 models: https://openairdocs.org/ad/76-09-05/models.md
Every aircraft: https://openairdocs.org/ad/76-09-05/aircraft.md

Its text cites no advisory circulars or STCs.

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