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The nature of the terrain in the vicinity of the accident site was such that potential emergency landing areas were limited and added to the complexity of the task of the pilot in responding to the in-flight emergency. The factors surrounding the in-flight shutdown of the engine could not be determined, as the problem could not be replicated in the engine test cell. No engine shutdown was recorded on the on-board diagnostic equipment.

The rotorcraft flight manual contained no specific information on an event such as that reported. However, the pilot's reaction to the main rotor RPM audio warning appeared inconsistent with the only guidance provided in the rotorcraft flight manual relating to an increase in main rotor RPM.

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