NTSB Identification: DEN87LA189.
The docket is stored on NTSB microfiche number 33636.
Accident occurred Sunday, July 19, 1987 in RED LODGE, MT
Probable Cause Approval Date: 05/09/1988
Aircraft: AEROSPATIALE SA316B, registration: N48184
Injuries: 1 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 SAID HE WAS GETTING READY TO TAKE OFF FROM A 9400-FT MSL LANDING ZONE A TOP A MOUNTAIN 7 MI SSW OF RED LODGE, MT. THE PLAT SAID THE HELICOPTER WAS POSITIONED ON A SLIGHT NORTH-SOUTH SLOPE AND POINTED TOWARDS THE WEST. THE WIND WAS FROM THE SOUTH GUSTING TO APRX 30 TO 40 KTS. THE PLT SAID THE ENG WAS RUNNING AND HE WAS ABOUT TO ENGAGE THE MAIN ROTOR. THE WIND SUDDENLY PITCHED THE HELICOPTER UP LATERALLY, LEFT TO RIGHT, AND BLEW IT OVER ON ITS SIDE.

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

PREFLIGHT PLANNING/PREPARATION..POOR..PILOT IN COMMAND

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

WIND INFORMATION..DISREGARDED..PILOT IN COMMAND


Contributing Factors

WEATHER CONDITION..CROSSWIND




Contributing Factors

WEATHER CONDITION..HIGH WIND


Contributing Factors

WEATHER CONDITION..GUSTS


Contributing Factors

ROTOR RPM..NOT ATTAINED..PILOT IN COMMAND

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