NTSB Identification: DEN88LA163.
The docket is stored on NTSB microfiche number 37307.
Accident occurred Tuesday, July 19, 1988 in GLENDIVE, MT
Probable Cause Approval Date: 10/02/1989
Aircraft: ENSTROM 280C, registration: N111CD
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 PLT WAS HOVERING ALONG A RIDGE LINE, HEADING SW. HE REPORTED THE WIND WAS FROM 310 DEG AT 15, GUSTING TO 20 KTS. DURING A RIGHT HOVERING TURN, THE PLT SAID HE NOTICED A LOSS OF ENG RPM. ATTEMPTS TO REGAIN THE RPM WERE TO NO AVAIL. THE PLT PERFORMED A PRECAUTIONARY LANDING IN A GULLEY. AT TOUCHDOWN THE HELICOPTER ENTERED DYNAMIC ROLLOVER TO THE LEFT. THE COMPUTED DENSITY ALTITUDE WAS APRX 4000 FT. A POST ACCIDENT INSPECTION AND ENG RUN FAILED TO REVEAL ANY MECHANICAL FACTORS THAT WOULD EXPLAIN THE REPORTED LOSS OF RPM.

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

AIRCRAFT PERFORMANCE,HELICOPTER HOVER PERFORMANCE..EXCEEDED

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

ROTOR RPM..NOT MAINTAINED..PILOT IN COMMAND


Contributing Factors

TERRAIN CONDITION..NONE SUITABLE


Contributing Factors

WEATHER CONDITION..HIGH DENSITY ALTITUDE


Contributing Factors

WEATHER CONDITION..CROSSWIND



Contributing Factors

LACK OF TOTAL EXPERIENCE IN TYPE OPERATION..PILOT IN COMMAND

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