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NTSB Report
October 14, 1991 · Piper PA24-180 · N7759P
Marysville, WA
Overview
Report Status
Probable Cause
Event Type
Accident
Date
October 14, 1991
Injury Outcomes
3 injuries (3 minor injuries)
Location
Marysville, WA
Aircraft
Piper PA24-180
Tail Number
N7759P
Operator
Jenkins Aircraft
Injuries
Minor
Aircraft Damage
Substantial
NTSB Number
SEA92LA007
A PIPER PA 24 IMPACTED THE TERRAIN DURING A FORCED LANDING, AFTER A TOTAL ENGINE FAILURE ON CLIMBOUT. INVESTIGATION REVEALED THAT THE ACCESSARY DRIVE GEAR WAS LOOSE ON THE END OF THE CRANKSHAFT, AND WAS THEREFORE NOT DRIVING THE ACCESSARY SECTION. THE AIRCRAFT HAD EXPERIENCED A PROPELLER STRIKE AT AN EARLIER DATE, AND THE INSTRUCTIONS IN THE TEXTRON LYCOMING SERVICE BULLETIN WERE NOT FOLLOWED WHEN THE REPAIRS WERE PERFORMED. THE BULLETIN CALLED FOR A NEW STYLE DRIVE GEAR AND GEAR RETAINING BOLT, BUT THE OLD STYLE PARTS WERE INSTALLED INSTEAD. ACCORDING TO LYCOMING, THE NEW PARTS MUST BE USED IN ORDER TO INSURE THAT THE GEAR SEATS ON THE CRANKSHAFT MOUNTING FACE, AND DOES NOT WORK LOOSE DURING ENGINE OPERATION.
NTSB Probable Cause
THE SLIPPAGE OF THE ACCESSARY DRIVE GEAR DUE TO IMPROPER MAINTENANCE BY OTHER MAINTENANCE PERSONNEL. FACTORS INCLUDE A FORCED LANDING IN UNSUITABLE TERRAIN.
Full Narrative
A PIPER PA 24 IMPACTED THE TERRAIN DURING A FORCED LANDING, AFTER A TOTAL ENGINE FAILURE ON CLIMBOUT. INVESTIGATION REVEALED THAT THE ACCESSARY DRIVE GEAR WAS LOOSE ON THE END OF THE CRANKSHAFT, AND WAS THEREFORE NOT DRIVING THE ACCESSARY SECTION. THE AIRCRAFT HAD EXPERIENCED A PROPELLER STRIKE AT AN EARLIER DATE, AND THE INSTRUCTIONS IN THE TEXTRON LYCOMING SERVICE BULLETIN WERE NOT FOLLOWED WHEN THE REPAIRS WERE PERFORMED. THE BULLETIN CALLED FOR A NEW STYLE DRIVE GEAR AND GEAR RETAINING BOLT, BUT THE OLD STYLE PARTS WERE INSTALLED INSTEAD. ACCORDING TO LYCOMING, THE NEW PARTS MUST BE USED IN ORDER TO INSURE THAT THE GEAR SEATS ON THE CRANKSHAFT MOUNTING FACE, AND DOES NOT WORK LOOSE DURING ENGINE OPERATION.
Flight
Event TypeAccident
Event Time15:30 PDT
Nearest Airport0nm N
Runway0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftPiper PA24-180
Tail NumberN7759P
Aircraft CategoryAir
DamageSubstantial
OperatorJenkins Aircraft
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsLycoming · O360A1D · Reciprocating · 180
Seats4
People & Injuries
Injury Summary3 injuries (3 minor injuries)
Fatal0
Serious0
Minor3
Uninjured0
Total3
Crew 1Age 69 · Third Class
Conditions
ConditionsVMC
LightDaylight
WindCalm
Visibility50 sm
CeilingNone
Temperature / Dew Point0 C / 0 C
Altimeter0
Weather SourcePILO