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NTSB Report
July 31, 1983 · Bell 47G-3B-1 · N11102
S. Lake Tahoe, CA
Overview
Report Status
Preliminary report
Event Type
Accident
Date
July 31, 1983
Injury Outcomes
3 injuries (1 serious injury, 2 minor injuries)
Location
S. Lake Tahoe, CA
Aircraft
Bell 47G-3B-1
Tail Number
N11102
Injuries
Serious
Aircraft Damage
Destroyed
NTSB Number
LAX83FA366
DURING TAKEOFF OVER DESCENDING TERRAIN IN A MOUNTAINOUS AREA, THE RPM BEGAN DECAYING WHEN THE HELICOPTER HAD ACCELERATED TO 40 KTS & WAS ABOUT 75 FT AGL. THE PLT APPLIED MORE THROTTLE & INCREASED THE COLLECTIVE, THEN NOTED THAT THE MANIFOLD PRESSURE WAS DECREASING & THE RPM CONTINUED TO DECAY. THE HELICOPTER SETTLED TO THE GROUND, ROLLED ONTO ITS LEFT SIDE & CAME TO REST INVERTED. AN EXAM REVEALED NO REASON FOR THE LOSS OF POWER. THE DENSITY ALT WAS ABOUT 8100 FT.
Full Narrative
DURING TAKEOFF OVER DESCENDING TERRAIN IN A MOUNTAINOUS AREA, THE RPM BEGAN DECAYING WHEN THE HELICOPTER HAD ACCELERATED TO 40 KTS & WAS ABOUT 75 FT AGL. THE PLT APPLIED MORE THROTTLE & INCREASED THE COLLECTIVE, THEN NOTED THAT THE MANIFOLD PRESSURE WAS DECREASING & THE RPM CONTINUED TO DECAY. THE HELICOPTER SETTLED TO THE GROUND, ROLLED ONTO ITS LEFT SIDE & CAME TO REST INVERTED. AN EXAM REVEALED NO REASON FOR THE LOSS OF POWER. THE DENSITY ALT WAS ABOUT 8100 FT.
Flight
Event TypeAccident
Event Time09:08 PDT
Nearest Airport0nm N
Runway0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftBell 47G-3B-1
Tail NumberN11102
Aircraft CategoryHeli
DamageDestroyed
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsLycoming · TVO-435-G1A · Reciprocating · 270
Seats3
People & Injuries
Injury Summary3 injuries (1 serious injury, 2 minor injuries)
Fatal0
Serious1
Minor2
Uninjured0
Total3
Crew 1Age 21 · Second Class
Conditions
ConditionsVMC
LightDaylight
Wind350° @ 4 kt
Visibility30 sm
CeilingNone
Temperature / Dew Point64 F / 37 C
Altimeter30.00 inHg
Observation Time15:55
Weather SourceWFAC