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NTSB Report
February 12, 1991 · Questaire Venture · N71T
San Luis Obispo, CA
Overview
Report Status
Probable Cause
Event Type
Accident
Date
February 12, 1991
Injury Outcomes
No injuries (1 uninjured)
Location
San Luis Obispo, CA
Aircraft
Questaire Venture
Tail Number
N71T
Operator
Michael C Thomas
Injuries
None
Aircraft Damage
Substantial
NTSB Number
LAX91LA107
THE PILOT WAS PERFORMING THE INITIAL TEST FLIGHT ON HIS HOMEBUILT AIRCRAFT. AFTER EXECUTING SEVERAL APPROACHES WITHOUT ACTUALLY LANDING THE AIRCRAFT, THE PILOT DECIDED TO MAKE A FINAL APPROACH TO A FULL STOP. AT APPROXIMATELY 800 FEET AGL, THE AIRCRAFT'S ENGINE EXPERIENCED A TOTAL LOSS OF POWER. THE PILOT EXECUTED A FORCED LANDING TO A FIELD. EXAMINATION BY THE FAA REVEALED THAT THE AIRCRAFT HAD ADEQUATE FUEL SUPPLY, BUT THE ENGINE FAILED AS A RESULT OF FUEL STARVATION CAUSED BY A MALFUNCTIONING FUEL SYSTEM VENT CHECK VALVE.
NTSB Probable Cause
THE FAILURE OF THE FUEL SYSTEM VENT CHECK VALVE, WHICH RESULTED IN FUEL STARVATION TO THE AIRCRAFT'S ENGINE.
Full Narrative
THE PILOT WAS PERFORMING THE INITIAL TEST FLIGHT ON HIS HOMEBUILT AIRCRAFT. AFTER EXECUTING SEVERAL APPROACHES WITHOUT ACTUALLY LANDING THE AIRCRAFT, THE PILOT DECIDED TO MAKE A FINAL APPROACH TO A FULL STOP. AT APPROXIMATELY 800 FEET AGL, THE AIRCRAFT'S ENGINE EXPERIENCED A TOTAL LOSS OF POWER. THE PILOT EXECUTED A FORCED LANDING TO A FIELD. EXAMINATION BY THE FAA REVEALED THAT THE AIRCRAFT HAD ADEQUATE FUEL SUPPLY, BUT THE ENGINE FAILED AS A RESULT OF FUEL STARVATION CAUSED BY A MALFUNCTIONING FUEL SYSTEM VENT CHECK VALVE.
Flight
Event TypeAccident
Event Time15:00 PST
Nearest Airport0nm N
Runway0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftQuestaire Venture
Tail NumberN71T
Aircraft CategoryAir
DamageSubstantial
OperatorMichael C Thomas
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsContinental · IO-550 · Reciprocating · 280
Seats2
People & Injuries
Injury SummaryNo injuries (1 uninjured)
Fatal0
Serious0
Minor0
Uninjured1
Total1
Crew 1Age 42 · None
Conditions
ConditionsVMC
LightDaylight
WindCalm
Visibility5 sm
CeilingNone
Temperature / Dew Point0 C / 0 C
Altimeter0
Weather SourcePILO