AD 2016-11-09
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Turbomeca | S | Airworthiness Directives; Turbomeca S.A. Turboshaft Engines |
Unsafe Condition
Reports of divergent rubbing between the piston shaft small diameter labyrinth and the rear bearing support, which could lead to failure of the labyrinth seal and engine, in-flight shutdown, and loss of control of the helicopter.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Remove the pre-modification (mod) TU357 gas generator module (M03) and replace with a part eligible for installation.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 4 months or 240 engine operating hours after the effective date of this AD, whichever occurs later.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Turbomeca S.A. Arriel 1D and 1D1 turboshaft engines with a pre-modification (mod) TU357 gas generator module (M03) installed.
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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