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.