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NTSB Report
September 4, 1991 · Piper PA-28R-200 · N2080T
Redwood City, CA
Overview
Report Status
Probable Cause
Event Type
Accident
Date
September 4, 1991
Injury Outcomes
1 injury (1 serious injury)
Location
Redwood City, CA
Aircraft
Piper PA-28R-200
Tail Number
N2080T
Operator
Crawford Jeffrey C
Injuries
Serious
Aircraft Damage
Substantial
NTSB Number
LAX91LA382
THE 400 HOUR SINCE FACTORY REMANUFACTURED ENGINE BEGAN TO RUN ROUGH, THEN IT QUIT WITH A LOUD 'BANG.' THE PILOT WAS ATTEMPTING TO COMPLETE A FORCED LANDING IN A PASTURE AREA WHEN THE AIRCRAFT COLLIDED WITH THE GROUND. DISASSEMBLY OF THE ENGINE REVEALED THAT THE NUMBER TWO CYLINDER CONNECTING ROD AND ITS ASSOCIATED ROD CAP HAD FAILED. METALLURGICAL EXAMINATION OF ALL CONNECTING RODS AND CAPS WAS PERFORMED. THE #2 ROD AND CAP FAILED DUE TO A FATIGUE FRACTURE WITH AN ORIGIN ON THE BORE SURFACE. AREAS OF GALLING WERE FOUND ON BOTH THE ROD CAP AND THE CONNECTING ROD BORE. CRACKS WERE IDENTIFIED WITHIN THE GALLED AREA ON THE NUMBER TWO CONNECTING ROD BORE. EXAMINATION OF THE THREE REMAINING CONNECTING RODS AND THEIR CAPS REVEALED GALLED AREAS WITHIN THE BORES. THE METALLURGISTS STATED THAT HE HAD OBSERVED SIMILAR FAILURES ON HELICOPTER PISTON ENGINES WHICH WERE KNOWN TO HAVE HAD AN OVERSPEED.
NTSB Probable Cause
THE FATIGUE FAILURE OF THE NUMBER TWO CONNECTING ROD AND ROD CAP DUE TO AN ENGINE OVERSPEED CONDITION WHICH THE RODS AND ROD CAPS WERE EXPOSED AT SOME UNDETERMINED HISTORICAL POINT.
Full Narrative
THE 400 HOUR SINCE FACTORY REMANUFACTURED ENGINE BEGAN TO RUN ROUGH, THEN IT QUIT WITH A LOUD 'BANG.' THE PILOT WAS ATTEMPTING TO COMPLETE A FORCED LANDING IN A PASTURE AREA WHEN THE AIRCRAFT COLLIDED WITH THE GROUND. DISASSEMBLY OF THE ENGINE REVEALED THAT THE NUMBER TWO CYLINDER CONNECTING ROD AND ITS ASSOCIATED ROD CAP HAD FAILED. METALLURGICAL EXAMINATION OF ALL CONNECTING RODS AND CAPS WAS PERFORMED. THE #2 ROD AND CAP FAILED DUE TO A FATIGUE FRACTURE WITH AN ORIGIN ON THE BORE SURFACE. AREAS OF GALLING WERE FOUND ON BOTH THE ROD CAP AND THE CONNECTING ROD BORE. CRACKS WERE IDENTIFIED WITHIN THE GALLED AREA ON THE NUMBER TWO CONNECTING ROD BORE. EXAMINATION OF THE THREE REMAINING CONNECTING RODS AND THEIR CAPS REVEALED GALLED AREAS WITHIN THE BORES. THE METALLURGISTS STATED THAT HE HAD OBSERVED SIMILAR FAILURES ON HELICOPTER PISTON ENGINES WHICH WERE KNOWN TO HAVE HAD AN OVERSPEED.
Flight
Event TypeAccident
Event Time19:15 PDT
Nearest Airport0nm N
Runway0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftPiper PA-28R-200
Tail NumberN2080T
Aircraft CategoryAir
DamageSubstantial
OperatorCrawford Jeffrey C
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsLycoming · IO-360-CIC · Reciprocating · 200
Seats4
People & Injuries
Injury Summary1 injury (1 serious injury)
Fatal0
Serious1
Minor0
Uninjured0
Total1
Crew 1Age 29 · Second Class
Conditions
ConditionsVMC
LightDaylight
WindCalm
Visibility30 sm
CeilingNone
Temperature / Dew Point70 F / 0 C
Altimeter0
Weather SourcePILO