NTSB Identification: DEN83LA200.
The docket is stored on NTSB microfiche number 22366.
Accident occurred Friday, August 26, 1983 in TUCKER, UT
Aircraft: BELL 206L-1, registration: N3900B
Injuries: 1 Serious.

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 BEING USED ON A SEISMIC DATA ACQUISTION OPERATION. WHILE LANDING BY A ROAD IN MOUNTAINOUS TERRAIN AT AN ELEVATION OF APRX 8400 FT, THE HELICOPTER WAS OBSERVED TO APPROACH TO A HOVER OVER THE ROADWAY. A CONSIDERABLE AMOUNT OF DUST WAS BLOWN FROM THE ROTOR DOWNWASH CAUSING PERSONNEL ON THE GROUND TO COVER THEIR EYES & LOOK AWAY. THE HELICOPTER WAS NEXT OBSERVED TO PULL UP & AWAY FROM THE GROUND PERSONNEL, THEN MOVE UP THE HILL (BESIDE THE ROAD) & TURN RIGHT TO FACE THE HILLSIDE. GROUND PERSONNEL REPORTED THAT IT THEN MADE AN UNUSUAL NOISE, SPUN AROUND, BEGAN TO WHIP BACK & FORTH, THEN DESCENDED INTO TREES IN AN UNCONTROLLED MANNER. AFTER IMPACT, IT ROLLED DOWN THE HILLSIDE & CAMETO REST AT THE ROAD. THE PLT WAS INJURED & COULD NOT REMEMBER THE OCCURRENCE. GROUND PERSONNEL THOUGHT THE ENG LOST POWER, BUT NO PREIMPACT FAILURE WAS FOUND. SEVERAL CIRCUIT BREAKERS WERE 'OUT' BUT 2 OF THEM (BOOST PUMP) WOULD NORMALLYHAVE BEEN PULLED AFTER LANDING. WIND FROM SOUTH, 10 KTS. WITNESS SAID, GUST BLEW DUST BACK TOWARD ACFT, WHILE HOVERING.

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

MAINTENANCE..IMPROPER..PILOT IN COMMAND

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

AIRCRAFT HANDLING..NOT MAINTAINED..PILOT IN COMMAND


Contributing Factors

TERRAIN CONDITION..MOUNTAINOUS/HILLY


Contributing Factors

TERRAIN CONDITION..DOWNHILL


Contributing Factors

TERRAIN CONDITION..HIGH OBSTRUCTION(S)


Contributing Factors

WEATHER CONDITION..HIGH DENSITY ALTITUDE


Contributing Factors

WEATHER CONDITION..UNFAVORABLE WIND


Contributing Factors

WEATHER CONDITION..GUSTS

Index for Aug1983 | Index of months