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NTSB Report
July 25, 1990 · Bell 206B · N2292W
Quincy, CA
Overview
Report Status
Probable Cause
Event Type
Accident
Date
July 25, 1990
Injury Outcomes
No injuries (4 uninjured)
Location
Quincy, CA
Aircraft
Bell 206B
Tail Number
N2292W
Injuries
None
Aircraft Damage
Substantial
NTSB Number
LAX90FA268
THE PILOT WAS CONDUCTING A HELICOPTER AERIAL SURVEY AND WAS CRUISING AT 400 FT AGL IN MOUNTAINOUS TERRAIN WHEN THE ENGINE, WITHOUT ANY WARNING, SUSTAINED A FLAME OUT. THE PILOT IMMEDIATELY EXECUTED AN AUTOROTATION AND WAS ABLE TO FIND A SUITABLE LANDING AREA. ON FINAL APPROACH HE OBSERVED A STEEL CABLE TRAVERSING THE LANDING SITE DIRECTLY IN THE HELICOPTER'S FLIGHT PATH. HE WAS ABLE TO FLY OVER THE CABLE BUT IN DOING SO THE MAIN ROTOR RPM DECAYED AND THE HELICOPTER SUSTAINED A HARD LANDING. THE POST ACCIDENT INVESTIGATION DISCLOSED THAT THE ENGINE WOULD NOT OPERATE AT GOVERNOR POWER LEVEL ANGLES OF LESS THAN 50 DEG. AFTER BENCH TESTING THE POWER TURBINE GOVERNOR IT OPERATED NORMALLY WHEN PLACED ON THE ENGINE. TEST ENGINEERS REPORTED THAT THIS CONDITIONS, IN ALL PROBABILITY, INDICATES A CONTAMINATE LODGED IN THE POWER TURBINE GOVERNOR. IT WAS DISCLODGED DURING THE BENCH TEST.
NTSB Probable Cause
AN UNIDENTIFIED CONTAMINATE LODGED IN THE FUEL GOVERNOR.
Full Narrative
THE PILOT WAS CONDUCTING A HELICOPTER AERIAL SURVEY AND WAS CRUISING AT 400 FT AGL IN MOUNTAINOUS TERRAIN WHEN THE ENGINE, WITHOUT ANY WARNING, SUSTAINED A FLAME OUT. THE PILOT IMMEDIATELY EXECUTED AN AUTOROTATION AND WAS ABLE TO FIND A SUITABLE LANDING AREA. ON FINAL APPROACH HE OBSERVED A STEEL CABLE TRAVERSING THE LANDING SITE DIRECTLY IN THE HELICOPTER'S FLIGHT PATH. HE WAS ABLE TO FLY OVER THE CABLE BUT IN DOING SO THE MAIN ROTOR RPM DECAYED AND THE HELICOPTER SUSTAINED A HARD LANDING. THE POST ACCIDENT INVESTIGATION DISCLOSED THAT THE ENGINE WOULD NOT OPERATE AT GOVERNOR POWER LEVEL ANGLES OF LESS THAN 50 DEG. AFTER BENCH TESTING THE POWER TURBINE GOVERNOR IT OPERATED NORMALLY WHEN PLACED ON THE ENGINE. TEST ENGINEERS REPORTED THAT THIS CONDITIONS, IN ALL PROBABILITY, INDICATES A CONTAMINATE LODGED IN THE POWER TURBINE GOVERNOR. IT WAS DISCLODGED DURING THE BENCH TEST.
Flight
Event TypeAccident
Event Time14:10 PDT
Nearest Airport0nm N
Runway0
Runway Length0
Runway Width0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftBell 206B
Tail NumberN2292W
Aircraft CategoryHeli
DamageSubstantial
Operating RulePart 135
Engines1
Engine TypeTurboshaft
Engine DetailsAllison · 250-C20B · Turboshaft · 317
Seats4
People & Injuries
Injury SummaryNo injuries (4 uninjured)
Fatal0
Serious0
Minor0
Uninjured4
Total4
Crew 1Age 47 · Second Class
Conditions
ConditionsVMC
LightDaylight
WindCalm
Visibility50 sm
CeilingNone
Temperature / Dew Point0 C / 0 C
Altimeter0
Weather SourcePILO