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NTSB Report
December 24, 1988 · Cessna 175 · N9373B
Starke, FL
Overview
Report Status
Preliminary report
Event Type
Accident
Date
December 24, 1988
Injury Outcomes
No injuries (3 uninjured)
Location
Starke, FL
Aircraft
Cessna 175
Tail Number
N9373B
Injuries
None
Aircraft Damage
Substantial
NTSB Number
MIA89LA058
FLT WAS 3 MILES EAST OF ARPT RETURNING TO LAND AT ALT OF APRX 2,000 FT, WHEN THE ENG QUIT. PLT WAS UNABLE TO RESTART & ELECTED TO LAND IN SMALL TREES AS A NEARBY HIGHWAY WAS CONGESTED. ACFT COLLIDED WITH TREES & FELL TO THE GROUND. EXAMINATION OF THE ENG REVEALED THE CRANKSHAFT FAILED AT THE REAR CRANKSHAFT CHEEK BETWEEN #1 & #2 CYLINDER CONNECTING RODS. METALLURGICAL EXAMINATION OF THE FAILED CRANKSHAFT REVEALED LOW & HIGH CYCLE FATIGUE. EVIDENCE INDICATED THAT THIS WAS CAUSED BY VIBRATIONS OF THE CRANKSHAFT DURING CONTACT OF THE THREE DYNAMIC COUNTERWEIGHTS TO THE ADJACENT CAMSHAFT LOBES. COUNTERWEIGHT CONTACT WAS CAUSED BY WORN COUNTERWEIGHT BUSHING. REVIEW OF THE ENG LOGBOOKS REVEALED A MAJOR OVERHAUL WAS PERFORMED IN 1969, APRX 793 HRS PRIOR TO THE FAILURE. THREE TOP OVERHAULS WERE PERFORMED. THE FIRST & SECOND PERFORMED AT ONE YEAR INTERVALS AFTER THE MAJOR. THE THIRD WAS PERFORMED 10 YEARS AFTER THE SECOND.
Full Narrative
FLT WAS 3 MILES EAST OF ARPT RETURNING TO LAND AT ALT OF APRX 2,000 FT, WHEN THE ENG QUIT. PLT WAS UNABLE TO RESTART & ELECTED TO LAND IN SMALL TREES AS A NEARBY HIGHWAY WAS CONGESTED. ACFT COLLIDED WITH TREES & FELL TO THE GROUND. EXAMINATION OF THE ENG REVEALED THE CRANKSHAFT FAILED AT THE REAR CRANKSHAFT CHEEK BETWEEN #1 & #2 CYLINDER CONNECTING RODS. METALLURGICAL EXAMINATION OF THE FAILED CRANKSHAFT REVEALED LOW & HIGH CYCLE FATIGUE. EVIDENCE INDICATED THAT THIS WAS CAUSED BY VIBRATIONS OF THE CRANKSHAFT DURING CONTACT OF THE THREE DYNAMIC COUNTERWEIGHTS TO THE ADJACENT CAMSHAFT LOBES. COUNTERWEIGHT CONTACT WAS CAUSED BY WORN COUNTERWEIGHT BUSHING. REVIEW OF THE ENG LOGBOOKS REVEALED A MAJOR OVERHAUL WAS PERFORMED IN 1969, APRX 793 HRS PRIOR TO THE FAILURE. THREE TOP OVERHAULS WERE PERFORMED. THE FIRST & SECOND PERFORMED AT ONE YEAR INTERVALS AFTER THE MAJOR. THE THIRD WAS PERFORMED 10 YEARS AFTER THE SECOND.
Flight
Event TypeAccident
Event Time11:50 EST
Nearest Airport0nm N
Runway0
Runway Length0
Runway Width0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftCessna 175
Tail NumberN9373B
Aircraft CategoryAir
DamageSubstantial
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsContinental · GO-300A · Reciprocating · 175
Seats4
People & Injuries
Injury SummaryNo injuries (3 uninjured)
Fatal0
Serious0
Minor0
Uninjured3
Total3
Crew 1Age 55 · Third Class
Conditions
ConditionsVMC
LightDaylight
Wind170° @ 7 kt
Visibility7 sm
CeilingBroken clouds 3500 ft
Temperature / Dew Point64 F
Altimeter30.00 inHg
Observation Time16:49
Weather SourceWFAC