AD 2003-12-14
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Turbomeca | S | Airworthiness Directives; Turbomeca S.A. Arriel 1 Turboshaft Engines |
Unsafe Condition
An unbalance of the gas generator rotating assembly due to the accumulation of dust in the M03 module, which may lead to deterioration of the gas generator rear bearing and uncommanded engine shutdown.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Perform initial and repetitive visual inspections for erosion of the axial compressor. Clean the M03 module if erosion exceeds specified limits or operating hours, as detailed in the AD. Perform reconditioning and checks of the engines.
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Compliance Time
Within 50 operating hours after the effective date for initial inspections and cleaning, and within specified intervals for repetitive inspections.
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Affected Aircraft
Turbomeca S.A. Arriel 1 series turboshaft engines, including models 1A, 1A1, 1A2, 1B, 1C, 1C1, 1C2, 1D, 1D1, 1E, 1E2, 1K, 1K1, 1S, and 1S1, installed on various helicopters such as Eurocopter AS 350, AS 350B1, AS 350B2, AS 365C, AS 365C2, AS 365N, AS 365N1, AS 365N2, BK 117C1, BK 117C2, Augusta A109 K2, and Sikorsky S76 C.
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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