NTSB Identification: LAX86LA291.
The docket is stored on NTSB microfiche number 32700.
Accident occurred Sunday, July 13, 1986 in LOS ALTOS, CA
Probable Cause Approval Date: 03/10/1988
Aircraft: ENSTROM EN-280-C, registration: N5692P
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 INSTRUCTOR STATED THAT DURING A PRACTICE AUTO ROTATIVE LANDING THE HELICOPTER LOST ROTOR RPM AND A HARD LANDING FOLLOWED. ON GROUND CONTACT, THE MAIN ROTOR BLADES STRUCK THE TAIL CONE, RESULTING IN SUBSTANTIAL DAMAGE. THE INSTRUCTOR FURTHER STATED THAT THERE WAS NO MECHANICAL FAILURE OR MALFUNCTION OF THE HELICOPTER.

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

ROTOR RPM..NOT MAINTAINED..DUAL STUDENT

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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