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NTSB Report
June 8, 1991 · Cullen/Roth Falcon XP · N9939M
Sebastopal, CA
Overview
Report Status
Probable Cause
Event Type
Accident
Date
June 8, 1991
Injury Outcomes
1 injury (1 serious injury)
Location
Sebastopal, CA
Aircraft
Cullen/Roth Falcon XP
Tail Number
N9939M
Operator
William E Cullen
Injuries
Serious
Aircraft Damage
Destroyed
NTSB Number
LAX91LA254
THE PILOT REPORTED THAT HE HAD MODIFIED THE RIGGING OF HIS EXPERIMENTAL CATEGORY AIRPLANE'S CANARD WING, AND ALSO PERFORMED OTHER ADJUSTMENTS TO THE AIRPLANE. THE PILOT INTENDED TO EVALUATE THE PERFORMANCE OF HIS MODIFIED AMATEUR BUILT AIRPLANE DURING THE TEST FLIGHT. THE PILOT CLIMBED TO 5000 FEET AGL, SLOWED TO 30 MPH AND ATTEMPTED TO TURN LEFT. THE AIRPLANE STALLED, ENTERED A SPIN AND THE WING FAILED.
NTSB Probable Cause
THE STRUCTURAL FAILURE OF THE AIRPLANE'S CANARD WING. CONTRIBUTING FACTORS WHICH RELATED TO THE ACCIDENT WERE THE PILOT'S PERFORMANCE OF AN ADJUSTMENT TO THE RIGGING OF HIS AIRPLANE WHICH DETERIORATED ITS FLIGHT CHARACTERISTICS.
Full Narrative
THE PILOT REPORTED THAT HE HAD MODIFIED THE RIGGING OF HIS EXPERIMENTAL CATEGORY AIRPLANE'S CANARD WING, AND ALSO PERFORMED OTHER ADJUSTMENTS TO THE AIRPLANE. THE PILOT INTENDED TO EVALUATE THE PERFORMANCE OF HIS MODIFIED AMATEUR BUILT AIRPLANE DURING THE TEST FLIGHT. THE PILOT CLIMBED TO 5000 FEET AGL, SLOWED TO 30 MPH AND ATTEMPTED TO TURN LEFT. THE AIRPLANE STALLED, ENTERED A SPIN AND THE WING FAILED.
Flight
Event TypeAccident
Event Time10:49 PDT
Nearest Airport0nm N
Runway0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftCullen/Roth Falcon XP
Tail NumberN9939M
Aircraft CategoryAir
DamageDestroyed
OperatorWilliam E Cullen
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsBombardier · ROTAX 503 · Reciprocating · 50
Seats2
People & Injuries
Injury Summary1 injury (1 serious injury)
Fatal0
Serious1
Minor0
Uninjured0
Total1
Crew 1Age 52 · Third Class
Conditions
ConditionsVMC
LightDaylight
Wind180° @ 5 kt
Visibility15 sm
CeilingBroken clouds 25000 ft
Temperature / Dew Point0 C / 0 C
Altimeter0
Weather SourcePILO