NTSB Identification: LAX86LA143.
The docket is stored on NTSB microfiche number 31882.
Nonscheduled 14 CFR
Accident occurred Monday, March 17, 1986 in TAHOE VALLEY, CA
Aircraft: AEROSPATIALE AS-350D, registration: N88GT
Injuries: 5 Minor,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 HELICOPTER COLLIDED WITH TREES AND CRASHED IN ROUGH MOUNTAINOUS TERRAIN DURING TAKEOFF. THE ACFT WAS SHUTTLING SKIERS FROM A LANDING AREA LOCATED AT APPROXIMATELY 8,300 FT MLS TO A RIDGELINE AT 11,000 FT MSL. THE PLT REPORTED THE EGT (T-4) WAS AT 790 DEG (C), OVER THE TAKEOFF 5 MIN LIMITATION. THE PLT ATTEMPTED A NORMAL TAKEOFF. AS THE ACFT REACHED AN ALT ABOVE THE 80 FT TALL TREES BELOW TRANSLATIONAL LIFT, IT SHUDDERED THEN SPUN COUNTERCLOCKWISE. THE OGE MAXIMUM RECOMMENDED WEIGHT WAS COMPUTER AT 1,812 KILOGRAMS OR 3,995.5 LBS. THE WEIGHT CALCULATED BY THE PLT AFTER THE ACCIDENT WAS 3,995 LBS. EXAMINATION OF THE ACFT WEIGHT AND BALANCE RECORDS REVEALED THAT COMPONENTS WERE INSTALLED ON THE ACFT AFTER IT HAD BEEN WEIGHED. THE PLT DID NOT INCLUDE ALL THE ADDITIONAL COMPONENTS IN HIS CALCULATIONS.

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

DIRECTIONAL CONTROL..NOT POSSIBLE..PILOT IN COMMAND

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

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

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

AIRSPEED..NOT ATTAINED..PILOT IN COMMAND

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

VERTICAL TAKEOFF..NOT POSSIBLE..PILOT IN COMMAND


Contributing Factors

TERRAIN CONDITION..MOUNTAINOUS/HILLY


Contributing Factors

TERRAIN CONDITION..MOUNTAINOUS/HILLY


Contributing Factors

MAINTENANCE,RECORDKEEPING..NOT MAINTAINED..COMPANY MAINTENANCE PERSONNEL


Contributing Factors

WEATHER CONDITION..HIGH DENSITY ALTITUDE


Contributing Factors

OBJECT..TREE(S)


Contributing Factors

AIRCRAFT PERFORMANCE,TAKEOFF CAPABILITY..EXCEEDED


Contributing Factors

AIRCRAFT WEIGHT AND BALANCE..IMPROPER..COMPANY MAINTENANCE PERSONNEL


Contributing Factors

FLIGHT MANUALS..IMPROPER..COMPANY MAINTENANCE PERSONNEL


Contributing Factors

AIRCRAFT PERFORMANCE,TAKEOFF CAPABILITY..EXCEEDED

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