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NTSB Report
April 27, 1990 · Piper PA-32-260 · N7732J
Tulsa, OK
Overview
Report Status
Probable Cause
Event Type
Accident
Date
April 27, 1990
Injury Outcomes
1 injury (1 minor injury)
Location
Tulsa, OK
Aircraft
Piper PA-32-260
Tail Number
N7732J
Operator
Martinaire
Injuries
Minor
Aircraft Damage
Destroyed
NTSB Number
FTW90LA102
WHILE ON FINAL, THE ENGINE QUIT WITHOUT WARNING AND THE PILOT WAS FORCED TO EXECUTE A FORCED LANDING INTO A HEAVILY WOODED BIRD SANCTUARY. EXAMINATION OF THE ENGINE REVEALED THAT THE CRANKSHAFT GEAR ATTACHMENT BOLT WAS LOOSE WITH 0.196 INCHES OF PLAY AND THE DOWEL PIN WAS SHEARED. GEAR INSTALLATION INSTRUCTIONS CALLED FOR THE GEAR TO BE SEATED WITH A DRIFT AND HAMMER WITH NO MORE THAN 0.001 INCHES OF CLEARANCE. OTHERWISE, THE DOWEL PIN WOULD BE OFFSET AND WORK. BOTH THE BOLT AND THE DOWEL PIN SHOWED EVIDENCE OF WORKING. SHEARING OF THE CRANKSHAFT DOWEL PIN WOULD HAVE RELEASED THE GEAR TO ROTATE ABOUT THE BOLT, THUS DISCONNECTING THE GEAR AND THE IDLER GEARS WHICH TRANSMITTED TORQUE TO THE MAGNETOS. SECONDARY DAMAGE WAS OBSERVED IN THE LEFT MAGNETO. MAINTENANCE RECORDS INDICATED THAT THE ENGINE HAD BEEN OVERHAULED 88.7 HOURS PRIOR TO THE ACCIDENT.
NTSB Probable Cause
AN ENGINE FAILURE DUE TO A DISCONNECT IN THE MAGNETO DRIVE TRAIN CAUSED BY THE CRANKSHAFT GEAR NOT BEING PROPERLY INSTALLED AND SECURED DURING A RECENT ENGINE OVERHAUL.
Full Narrative
WHILE ON FINAL, THE ENGINE QUIT WITHOUT WARNING AND THE PILOT WAS FORCED TO EXECUTE A FORCED LANDING INTO A HEAVILY WOODED BIRD SANCTUARY. EXAMINATION OF THE ENGINE REVEALED THAT THE CRANKSHAFT GEAR ATTACHMENT BOLT WAS LOOSE WITH 0.196 INCHES OF PLAY AND THE DOWEL PIN WAS SHEARED. GEAR INSTALLATION INSTRUCTIONS CALLED FOR THE GEAR TO BE SEATED WITH A DRIFT AND HAMMER WITH NO MORE THAN 0.001 INCHES OF CLEARANCE. OTHERWISE, THE DOWEL PIN WOULD BE OFFSET AND WORK. BOTH THE BOLT AND THE DOWEL PIN SHOWED EVIDENCE OF WORKING. SHEARING OF THE CRANKSHAFT DOWEL PIN WOULD HAVE RELEASED THE GEAR TO ROTATE ABOUT THE BOLT, THUS DISCONNECTING THE GEAR AND THE IDLER GEARS WHICH TRANSMITTED TORQUE TO THE MAGNETOS. SECONDARY DAMAGE WAS OBSERVED IN THE LEFT MAGNETO. MAINTENANCE RECORDS INDICATED THAT THE ENGINE HAD BEEN OVERHAULED 88.7 HOURS PRIOR TO THE ACCIDENT.
Flight
Event TypeAccident
Event Time09:27 CDT
Nearest AirportTulsa Int. (0nm N)
Runway17R
Runway Length6101 ft
Runway Width150 ft
Flight Plan FiledIFR
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftPiper PA-32-260
Tail NumberN7732J
Aircraft CategoryAir
DamageDestroyed
OperatorMartinaire
Operating RulePart 135
Engines1
Engine TypeReciprocating
Engine DetailsLycoming · O-540-E4B5 · Reciprocating · 260
Seats6
People & Injuries
Injury Summary1 injury (1 minor injury)
Fatal0
Serious0
Minor1
Uninjured0
Total1
Crew 1Age 68 · Second Class
Conditions
ConditionsVMC
LightDaylight
Wind180° @ 8 kt
Visibility10 sm
CeilingBroken clouds 2000 ft
Temperature / Dew Point64 F / 59
Altimeter29.00 inHg
Observation Time14:38
Weather SourceWFAC