AD 2010-11-10
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Aviat | Various | Airworthiness Directives; Turbomeca Astazou XIV B and XIV H Turboshaft Engines |
| engine | Turbomeca | Astazou XIV B and XIV H | Airworthiness Directives; Turbomeca Astazou XIV B and XIV H Turboshaft Engines |
Unsafe Condition
Investigation of an uncommanded in-flight shutdown (IFSD) revealed that a third stage turbine wheel rupture was not contained by the turbine casings. The released portion consisted of a turbine blade together with the rim piece immediately below the blade, bounded by two adjacent axial slots and a fatigue crack that had developed between the holes in which the slots terminate.
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Required Actions
Inspect third stage turbine wheels with part numbers 0265257000, 0265257020, 0265257060, and 0265257050 (as listed in Appendix 1 of Turbomeca MSB No. 283 72 0804, Version C) for damage. Remove any damaged wheel.
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Compliance Time
Before further flight
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Affected Aircraft
Turbomeca Astazou XIV B and XIV H turboshaft engines with third stage turbine wheels incorporating modification AB 173 (SB No. 283 72 0091) or modification AB 208 (SB No. 283 72 0117), but not incorporating SB No. 283 72 805. Affected part numbers include 0265257000, 0265257020, 0265257060, and 0265257050 (with specific serial numbers listed in Appendix 1 of MSB No. 283 72 0804, Version C). These engines are installed on, but not limited to, single-engine Aerospatiale AS319B 'Alouette III' and AS342J 'Gazelle' helicopters.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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