Airworthiness Directives; Eurocopter Deutschland GmbH (ECD) Model MBB-BK 117 Series Helicopters

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This document proposes the adoption of a new airworthiness directive (AD) that is applicable to Eurocopter Deutschland GmbH (ECD) Model MBB-BK 117 series helicopters. This proposal would require a modification of the latches on the transmission and engine cowlings access doors. This proposal is prompted by five occurrences of an engine or transmission cowling access door becoming loose in flight. The actions specified by the proposed AD are intended to prevent the transmission and engine cowling access doors from opening in flight, being struck by the main rotor blade, and subsequently, separating from the helicopter and being ingested by the main rotor or tail rotor system resulting in a loss of control of the helicopter.