NTSB Identification: DEN88LA025.
The docket is stored on NTSB microfiche number 35277.
Accident occurred Thursday, November 19, 1987 in GRAND FORKS, ND
Probable Cause Approval Date: 12/27/1988
Aircraft: HUGHES 269C, registration: N11079
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.

THE CFI WAS INSTRUCTING THE PVT RATED DUAL STUDENT IN SIMULATED FORCED LANDINGS. DURING THE POWER RECOVERY FOLLOWING A PRACTICE AUTOROTATION, THE ENGINE FAILED TO REGAIN RPM AT FULL THROTTLE. DURING THE FORCED LANDING, THE HELICOPTER NOSED OVER AT TOUCHDOWN AND THE MAIN ROTOR STRUCK THE TERRAIN. A POST ACCIDENT ENGINE RUN PRODUCED FULL RATED POWER UNDER TEST CELL CONDITIONS. THE ENGINE INSPECTION DID NOT REVEAL EVIDENCE TO EXPLAIN THE REPORTED FAILURE OF THE ENGINE TO RESPOND.

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

THROTTLE/POWER CONTROL..INADEQUATE..DUAL STUDENT

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

ADEQUATE ROTOR RPM..NOT MAINTAINED..DUAL STUDENT

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

ROTOR RPM..NOT CORRECTED..PILOT IN COMMAND(CFI)

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

SUPERVISION..INADEQUATE..PILOT IN COMMAND(CFI)

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