NTSB Identification: DEN84LA139.
The docket is stored on NTSB microfiche number 24199.
Accident occurred Sunday, April 29, 1984 in NEAR DILLON, CO
Aircraft: AEROSPATIALE 316B, registration: N608RM
Injuries: 3 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.

WHEN THE PLT TOOK OFF FROM A MOUNTAINOUS SKI AREA, LIGHT TO MODERATE SNOW WAS FALLING & THE WINDS WERE COMING UP THE VALLEY AT 5 TO 10 KTS. DURING THE FLT, HE ENCOUNTERED AN ESTIMATED 35 KT UPSLOPE WIND AS HE WAS PROCEEDING ON THE UPWIND SIDE OF A RIDGE AT AN ELEVATION OF ABOUT 12700 FT. WITH THE UPDRAFT, HE WAS ABLE TO REDUCE POWER. THE HORIZON WAS NOT VISIBLE BUT HE COULD SEE THE MOUNTAIN TO HIS LEFT REAR AREA. JUST PRIOR TO THE ACCIDENT, THE ACFT WAS TRAVELING AT ABOUT 40 KTS AT 100 TO 150 FT AGL. THE PLT STATED THAT WHILE HE WAS STILL IN AN UPDRAFT WITH REDUCED POWER, HE LOOKED BACK, NO MORE THAN 3 TO 5 SEC. AS HE LOOKED FORWARD AGAIN. HE ENCOUNTERED A WIND SHIFT WHICH PUT HIM IN A DOWNWIND, LOW POWER SITUATION. FEELING THERE WAS INSUFFICIENT SPACE TO TURN DOWNHILL, HE TURNED UPHILL, ADDED POWER & FLARED. THE HELICOPTER TOUCHED DOWN HARD ON STEEP TERRAIN AT ABOUT 12500 FT. THEN BECAME AIRBORNE AGAIN. IT IMPACTED AGAIN AFTER DROPPING 15 TO 25 FT & CAME TO REST. THE T/R & T/R GEAR BOX SEPARATED DURING THE SEQUENCE.

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

PLANNING/DECISION..IMPROPER..PILOT IN COMMAND


Contributing Factors

WEATHER CONDITION..HIGH DENSITY ALTITUDE


Contributing Factors

TERRAIN CONDITION..MOUNTAINOUS/HILLY


Contributing Factors

TERRAIN CONDITION..HIGH TERRAIN


Contributing Factors

WEATHER CONDITION..SNOW


Contributing Factors

TERRAIN CONDITION..SNOW COVERED


Contributing Factors

VISUAL/AURAL DETECTION..PILOT IN COMMAND


Contributing Factors

WEATHER CONDITION..UNFAVORABLE WIND


Contributing Factors

WEATHER CONDITION..DOWNDRAFT


Contributing Factors

TERRAIN CONDITION..UPHILL

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