AD 2010-19-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Aviat | Various | Airworthiness Directives; Turbomeca Arriel 1 Series Turboshaft Engines |
| engine | Turbomeca | Arriel 1 Series | Airworthiness Directives; Turbomeca Arriel 1 Series Turboshaft Engines |
Unsafe Condition
Metallurgical non-conformities have been found in Arriel 1 gas generator (GG) second stage turbine discs introduced by Turbomeca Modification TU347 (P/N 0 292 25 040 0), which could lead to failure of the turbine disc and release of high energy debris, potentially damaging the helicopter.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
For turbine discs without the 'CFR' marking, remove them from service before exceeding 2,500 cycles-in-service (CIS) since-new or within 20 CIS from the effective date of the AD, whichever occurs later. For turbine discs with the 'CFR' marking, remove them from service before exceeding 3,500 CIS since-new.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 20 cycles-in-service (CIS) from the effective date of the AD for discs without the 'CFR' marking, or before exceeding the specified cycle limits.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Turbomeca Arriel 1A, 1A1, 1B, 1C, 1C1, 1C2, 1D, 1D1, and 1S1 turboshaft engines that have incorporated Modification TU347, installed on helicopters such as Eurocopter AS350 series, AS365 and SA365 series, and Sikorsky S-76A and S-76C series.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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