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NTSB Report
March 22, 1982 · Aerospatiale SA316B · N9829C
Near Brideport, CA
Overview
Report Status
Preliminary report
Event Type
Accident
Date
March 22, 1982
Injury Outcomes
7 injuries (4 serious injuries, 3 minor injuries)
Location
Near Brideport, CA
Aircraft
Aerospatiale SA316B
Tail Number
N9829C
Operator
Mammoth Heli-Ski Tioyabe
Injuries
Serious
Aircraft Damage
Destroyed
NTSB Number
LAX82FA117
AFTER TAKING OFF IN A MOUNTAINOUS AREA, THE PILOT BEGAN CLIMBING IN UP-CURRENTS ON THE SIDE OF A CANYON. WHILE FOLLOWING A RIDGE AT ABOUT 100 FT AGL (11,000 FT MSL), HE HEARD A LOUD NOISE THAT WAS FOLLOWED BY A SHUDDER AND VIBRATIONS. THE HELICOPTER BEGAN DESCENDING RAPIDLY. THE PILOT TURNED TOWARD THE RIDGE AND THE HELICOPTER IMPACTED IN A SNOWFIELD. AN EXAMINATION REVEALED THAT THE OIL FILTER COVER OF THE GEAR BOX HAD SEPARATED. A TAPERED PIN WHICH WAS USED TO SECURE THE COVER HAD SHEARED FROM OVERLOAD. A DISASSEMBLY OF THE MAIN TRANSMISSION REVEALED THAT THE LOWER PLANETARY GEAR HAD FAILED FROM OIL STARVATION. ONLY 20 MM OF OIL WAS FOUND IN THE BOTTOM OF THE TRANSMISSION CASE.
Full Narrative
AFTER TAKING OFF IN A MOUNTAINOUS AREA, THE PILOT BEGAN CLIMBING IN UP-CURRENTS ON THE SIDE OF A CANYON. WHILE FOLLOWING A RIDGE AT ABOUT 100 FT AGL (11,000 FT MSL), HE HEARD A LOUD NOISE THAT WAS FOLLOWED BY A SHUDDER AND VIBRATIONS. THE HELICOPTER BEGAN DESCENDING RAPIDLY. THE PILOT TURNED TOWARD THE RIDGE AND THE HELICOPTER IMPACTED IN A SNOWFIELD. AN EXAMINATION REVEALED THAT THE OIL FILTER COVER OF THE GEAR BOX HAD SEPARATED. A TAPERED PIN WHICH WAS USED TO SECURE THE COVER HAD SHEARED FROM OVERLOAD. A DISASSEMBLY OF THE MAIN TRANSMISSION REVEALED THAT THE LOWER PLANETARY GEAR HAD FAILED FROM OIL STARVATION. ONLY 20 MM OF OIL WAS FOUND IN THE BOTTOM OF THE TRANSMISSION CASE.
Flight
Event TypeAccident
Event Time10:00 PST
Nearest Airport0nm N
Runway0
Runway Length0
Runway Width0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftAerospatiale SA316B
Tail NumberN9829C
Aircraft CategoryHeli
DamageDestroyed
OperatorMammoth Heli-Ski Tioyabe
Operating RulePart 135
Engines1
Engine TypeTurboshaft
Engine DetailsTurbomecca · ARTOUSTE IIIB · Turboshaft · 858
Seats7
People & Injuries
Injury Summary7 injuries (4 serious injuries, 3 minor injuries)
Fatal0
Serious4
Minor3
Uninjured0
Total7
Crew 1Age 36 · Second Class
Conditions
ConditionsVMC
LightDaylight
WindCalm
Visibility40 sm
CeilingNone
Temperature / Dew Point11 C / 0 C
Altimeter30.00 inHg
Observation Time09:42