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NTSB Report
July 31, 1992 · Boeing A75 · N62552
Cibolo, TX
Overview
Report Status
Probable Cause
Event Type
Accident
Date
July 31, 1992
Injury Outcomes
1 injury (1 fatality)
Location
Cibolo, TX
Aircraft
Boeing A75
Tail Number
N62552
Operator
Perdue Harold F
Injuries
Fatal
Aircraft Damage
Destroyed
NTSB Number
FTW92FA197
THE COMMERCIAL PILOT HAD BEEN TROUBLESHOOTING A VIBRATION PRESENT IN HIS AIRPLANE FOR THE LAST 10 FLIGHT HOURS. AFTER THE BLADE ANGLES ON THE PROPELLER BLADES WERE REALIGNED HE FLEW THE AIRPLANE TO CHECK THE VIBRATION LEVEL. WHILE ON A LEFT DOWNWIND, THE PROPELLER SEPARATED FROM THE ENGINE AND SEVERED A WING STRUT AND PORTION OF THE LEFT WING. AFTER BOTH OF THE BIPLANE'S LEFT WINGS COLLAPSED, THE AIRPLANE ENTERED A LEFT VERTICAL SPIRAL AND IMPACTED IN AN OPEN PASTURE. SEPARATION OF THE CRANKSHAFT WAS A RESULT OF FATIGUE ORIGINATING IN THE THREADS AT A POSITION NORMALLY IN LINE WITH THE AFT FACE OF THE THRUST NUT. THE THRUST NUT ALSO FAILED IN FATIGUE. NUT CONFIGURATION WAS DIFFERENT FROM THE CONFIGURATION INDICATED IN THE ENGINEERING DRAWING. HOWEVER, IT WAS NOT ESTABLISHED IF THIS WAS A CONTRIBUTING FACTOR TO THE FAILURE. THERE WAS ALSO NO EVIDENCE OF OVER TORQUE DURING INSTALLATION.
NTSB Probable Cause
FAILURE OF THE ENGINE CRANKSHAFT DUE FATIGUE AND THE RESULTANT COLLAPSING OF THE LEFT WING.
Full Narrative
THE COMMERCIAL PILOT HAD BEEN TROUBLESHOOTING A VIBRATION PRESENT IN HIS AIRPLANE FOR THE LAST 10 FLIGHT HOURS. AFTER THE BLADE ANGLES ON THE PROPELLER BLADES WERE REALIGNED HE FLEW THE AIRPLANE TO CHECK THE VIBRATION LEVEL. WHILE ON A LEFT DOWNWIND, THE PROPELLER SEPARATED FROM THE ENGINE AND SEVERED A WING STRUT AND PORTION OF THE LEFT WING. AFTER BOTH OF THE BIPLANE'S LEFT WINGS COLLAPSED, THE AIRPLANE ENTERED A LEFT VERTICAL SPIRAL AND IMPACTED IN AN OPEN PASTURE. SEPARATION OF THE CRANKSHAFT WAS A RESULT OF FATIGUE ORIGINATING IN THE THREADS AT A POSITION NORMALLY IN LINE WITH THE AFT FACE OF THE THRUST NUT. THE THRUST NUT ALSO FAILED IN FATIGUE. NUT CONFIGURATION WAS DIFFERENT FROM THE CONFIGURATION INDICATED IN THE ENGINEERING DRAWING. HOWEVER, IT WAS NOT ESTABLISHED IF THIS WAS A CONTRIBUTING FACTOR TO THE FAILURE. THERE WAS ALSO NO EVIDENCE OF OVER TORQUE DURING INSTALLATION.
Flight
Event TypeAccident
Event Time10:49 CDT
Nearest Airport0nm N
Runway0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftBoeing A75
Tail NumberN62552
Aircraft CategoryAir
DamageDestroyed
OperatorPerdue Harold F
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsContinental · W670-6A · Reciprocating · 220
Seats2
People & Injuries
Injury Summary1 injury (1 fatality)
Fatal1
Serious0
Minor0
Uninjured0
Total1
Crew 1Age 70 · Second Class
Conditions
ConditionsVMC
LightDaylight
Wind190° @ 9 kt
Visibility7 sm
CeilingBroken clouds 25000 ft
Altimeter30.00 inHg
Observation Time14:57
Weather SourceWFAC