Incident Overview
A student pilot was conducting a training cross-country flight when the main rotor tachometer needle decreased below the engine tachometer needle. In response, the pilot turned the helicopter to return to the departure airport. However, he was unable to maintain altitude and subsequently landed hard in rough terrain.
Preflight Observations
After the accident, the student pilot reported that he had observed oil leaking in the vicinity of the centrifugal dry clutch during both the preflight inspection for this flight and during previous preflight inspections.
Sequence of Events
The flight began as a routine training cross-country mission. Shortly after takeoff, the pilot noticed the discrepancy between the two tachometer readings. He immediately initiated a turn back toward the airport. Despite his efforts, the helicopter could not maintain altitude, resulting in a hard landing in uneven terrain.
Post-Accident Statements
The student pilot provided information regarding oil leaks from the centrifugal dry clutch that had been noted before the accident. No further details about the condition of the helicopter or the pilot were provided in the source.