AD 2005-12-08
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Turbomeca | S | Airworthiness Directives; Turbomeca S.A. Arrius 2 B1, 2 B1A, 2 B1A-1, and 2 B2 Turboshaft Engines |
Unsafe Condition
Simultaneous loss of automatic control of both engines due to the engine control system's intolerance to the loss of steps on the fuel metering valve actuator, leading to a FADEC FAIL indication and transition to manual fuel flow control.
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Required Actions
Simultaneously on both engines of the helicopter, perform a one-time upgrade of the EECU software by either replacing the EECU or uploading the software, using the procedures described in the applicable Turbomeca Mandatory Service Bulletin (MSB).
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Compliance Time
Within 90 days after the effective date of the AD.
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Affected Aircraft
Turbomeca S.A. Arrius 2 B1, 2 B1A, 2 B1A-1, and 2 B2 turboshaft engines installed on, but not limited to, Eurocopter Deutschland GmbH EC 135 T1 and EC 135 T2 helicopters.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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