AD 2021-26-26
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Turbomeca S.A. | Various | Airworthiness Directives; Safran Helicopter Engines, S.A. (Type Certificate Previously Held by Turbomeca S.A.) Turboshaft Engines |
| aircraft | Airbus | Various | Airworthiness Directives; Safran Helicopter Engines, S.A. (Type Certificate Previously Held by Turbomeca S.A.) Turboshaft Engines |
| engine | Turbomeca | S | Airworthiness Directives; Safran Helicopter Engines, S.A. (Type Certificate Previously Held by Turbomeca S.A.) Turboshaft Engines |
| engine | Safran | Helicopter | Airworthiness Directives; Safran Helicopter Engines, S.A. (Type Certificate Previously Held by Turbomeca S.A.) Turboshaft Engines |
Unsafe Condition
A difference between the position datum of the fuel metering valve and its measured position could lead to loss of automatic control on both engines installed on an Airbus Helicopters Deutschland (formerly Eurocopter Deutschland) EC135 helicopter during flight.
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Required Actions
Replace the EECU or upgrade the EECU software for engines with a certain EECU part number (P/N) installed. Prohibit installation of an affected EECU onto any engine.
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Compliance Time
Within 50 flight hours
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Affected Aircraft
Safran Helicopter Engines, S.A. (Type Certificate Previously Held by Turbomeca S.A.) Arrius 2 B1, 2 B1A, 2 B1A-1, and 2 B2 model turboshaft engines.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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