NTSB Identification: CHI87LA150.
The docket is stored on NTSB microfiche number 34426.
Accident occurred Wednesday, June 17, 1987 in AURORA, IL
Probable Cause Approval Date: 10/25/1988
Aircraft: HUGHES 300C, registration: N3625B
Injuries: 2 Uninjured.

NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

WHILE THE STUDENT & INSTRUCTOR (CFI) WERE ON AN INSTRUCTIONAL FLT, A DECISION WAS MADE TO PRACTICE AN AUTOROTATION & SIMULATED TAIL ROTOR FAILURE. RPRTDLY, A SMOOTH TOUCHDOWN WAS MADE, BUT THE HELICOPTER BEGAN TO VIBRATE. THE CFI ELECTEDTO GET THE HELICOPTER AIRBORNE AGAIN, BUT STATED THAT THERE WAS INSUFFICIENT RPM TO MAINTAIN FLT. SUBSEQUENTLY, THE HELICOPTER MADE TWO 360 DEG TURNS TO THE RGT & CONTACTED THE GROUND. NO PREIMPACT FAILURE OR MALFUNCTION OF THE HELICOPTER WAS RPRTD.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

ROTOR RPM..INADEQUATE..PILOT IN COMMAND(CFI)




Contributing Factors

MISCELLANEOUS..VIBRATION

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