NTSB Identification: LAX88LA198.
The docket is stored on NTSB microfiche number 38360.
Accident occurred Friday, May 27, 1988 in LA VERNE, CA
Probable Cause Approval Date: 01/04/1990
Aircraft: ENSTROM F28A, registration: N4898
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 HELICOPTER LANDED HARD DURING A PRACTICE TOUCHDOWN AUTOROTATION (AUTO). THE HELO REMAINED IN CLOSED TRAFFIC FOR THE PURPOSE OF PRACTICING TOUCHDOWN AUTOS TO A LANDING AREA ADJACENT TO THE APRT'S RWY. THERE WAS ALSO ANOTHER HELO IN CLOSED TRAFFIC USING THE LANDING AREA FOR THE SAME PURPOSE. THE OTHER HELO WAS LANDING LONG IN THE AREA ALLOWING THE ACCIDENT HELO TO USE THE FIRST HALF. THE PVT PLT INITIATED THE AUTO. THE CFI THEN TOOK COMMAND OF THE HELO BECAUSE HE FELT THEY WOULD NOT CLEAR A PERIMETER FENCE LOCATED SHORT OF THE INTENDED TOUCHDOWN POINT. THE CFI THEN APPLIED COLLECTIVE PITCH TO EXTEND THE GLIDE OVER THE FENCE. THE PRIVATE PLT INDICATED THAT THE ROTOR RPM WAS DEPLETED AND THE CFI DID NOT FLARE THE HELO SUFFICIENTLY TO REGAIN ROTOR RPM OR DECREASE THE GROUND SPEED. THE HELO LANDED HARD AND BOUNCED. NEITHER THE PRIVATE PLT NOR THE CFI REPORTED ANY MECHANICAL FAILURES OR MALFUNCTIONS.

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

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

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

COLLECTIVE..IMPROPER..PILOT IN COMMAND(CFI)

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

ADEQUATE ROTOR RPM..NOT MAINTAINED..PILOT IN COMMAND(CFI)

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

REMEDIAL ACTION..DELAYED..PILOT IN COMMAND(CFI)


Contributing Factors

AUTOROTATION..PREMATURE..DUAL STUDENT



Contributing Factors

PROPER GLIDEPATH..MISJUDGED..DUAL STUDENT

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