Airworthiness Directives; Eurocopter Deutschland Model EC135 Helicopters

This amendment adopts a new airworthiness directive (AD) for Eurocopter Deutschland (Eurocopter) Model EC135 helicopters with Turbomeca Arrius 2B1 engines installed. This action requires modifying the engine electrical control unit (FADEC) software and the collective linear transducer (LVDT). This amendment is prompted by a parameter discrepancy within the engine fuel main metering unit that is transmitted to the FADEC. This condition, if not corrected, could result in deactivation of the engine main fuel-metering valve, loss of automatic control of the affected engine, and subsequent loss of control of the helicopter.