NTSB Identification: SEA83LA134.
The docket is stored on NTSB microfiche number 21198.
Accident occurred Monday, June 27, 1983 in LEBANON, OR
Aircraft: ENSTROM F28A, registration: N9240
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 WAS DAMAGED IN A ROLL-OVER DURING A FORCED LANDING ON A SOFT PLOWED FIELD. THE PILOT STATED THAT HE WAS CHECKING ANOTHER COMPANY PILOT AND IN DOING SO HE ABRUPTLY REDUCED POWER TO SIMULATE ENGINE FAILURE. A TOTAL LOSS OF POWER OCCURRED. THE ACFT WAS AT 1800 FT MSL. AN AUTOROTATION WAS MADE ONTO A SOFT PLOWED FIELD. THE PILOT INITIATED A FLARE AT 50 FT AGL WITH THE ACFT SKIDDING 20 FT AND SPINNING AROUND 180 DEGREES BEFORE COMING TO REST ON ITS RIGHT SIDE.A LATER VERSION OF THE OPERATORS MANUAL STATES THAT CAUTION SHOULD BE USED IN ABRUPT POWER CHANGES DUE TO THE SENSITIVITY OF THE FUEL INJECTED ENGINES. THE MANUAL FOR THIS ACFT DOES NOT CONTAIN THAT STATEMENT. THE PILOT AND OPERATOR STATED DURING INTERVIEW THAT THE THROTTLE WAS ABRUPTLY REDUCED.

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

THROTTLE/POWER CONTROL..IMPROPER USE OF..PILOT IN COMMAND(CFI)

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

TERRAIN CONDITION..ROUGH/UNEVEN

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

FLIGHT MANUALS..INACCURATE..MANUFACTURER


Contributing Factors

AUTOROTATION..PERFORMED..PILOT IN COMMAND(CFI)

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