AD 2016-03-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Turbomeca | S | Airworthiness Directives; Turbomeca S.A. Turboshaft Engines |
Unsafe Condition
Torque conformation box (TCB) failures caused by cracks on soldered joints of TCB resistors, leading to limited power availability in a One Engine Inoperative (OEI) case and reduced control of the helicopter.
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Required Actions
Inspect the TCB for correct resistance values using Turbomeca S.A. Mandatory Service Bulletin 292 72 2860, Version A. Remove any TCB that fails inspection before further flight. Repeat inspections every 600 engine flight hours (EFHs).
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Compliance Time
Within 600 engine flight hours (EFHs) or 6 months after the effective date of this AD, whichever occurs first.
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Affected Aircraft
Turbomeca S.A. ARRIEL 2C, 2C1, 2C2, 2S1, and 2S2 turboshaft engines with modification TU34 or TU34A installed.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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