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NTSB Report
June 27, 1990 · Cessna 206 · N7560G
Fairbanks, AK
Overview
Report Status
Probable Cause
Event Type
Accident
Date
June 27, 1990
Injury Outcomes
1 injury (1 serious injury), 1 uninjured
Location
Fairbanks, AK
Aircraft
Cessna 206
Tail Number
N7560G
Injuries
Serious
Aircraft Damage
Substantial
NTSB Number
ANC90FA097
WHILE IN CRUISE FLIGHT, THE PILOT-IN-COMMAND EXPERIENCED A COMPLETE MECHANICAL STOPPAGE OF THE POWERPLANT. HE WAS FORCED TO LAND IN A BURNED SECTION OF WOODLAND THAT HAD DEAD TREES SCATTERED THROUGHOUT AND ONTO ROUGH AND UNEVEN TUNDRA. SUBSEQUENT EXAMINATION OF THE ENGINE REVEALED THAT THE NUMBER 5 CYLINDER'S PISTON WRISTPIN HAD FAILED AND ALLOWED THE CONNECTING ROD TO SEPARATE FROM THE PISTON. THE CONNECTING ROD DAMAGED THE INTERNAL PORTIONS OF THE ENGINE CASE IN ITS PLANE OF ROTATION AND BY JAMMING INTO THE CASE CAUSED THE ENGINE TO STOP ROTATING.
NTSB Probable Cause
THE FAILURE OF THE WRISTPIN CAUSED THE SEPARATION OF THE CONNECTING ROD FROM THE PISTON AND SUBSEQUENT SEIZURE OF THE ENGINE. A FACTOR WAS UNAVAILABILITY OF A SUITABLE FORCED LANDING AREA.
Full Narrative
WHILE IN CRUISE FLIGHT, THE PILOT-IN-COMMAND EXPERIENCED A COMPLETE MECHANICAL STOPPAGE OF THE POWERPLANT. HE WAS FORCED TO LAND IN A BURNED SECTION OF WOODLAND THAT HAD DEAD TREES SCATTERED THROUGHOUT AND ONTO ROUGH AND UNEVEN TUNDRA. SUBSEQUENT EXAMINATION OF THE ENGINE REVEALED THAT THE NUMBER 5 CYLINDER'S PISTON WRISTPIN HAD FAILED AND ALLOWED THE CONNECTING ROD TO SEPARATE FROM THE PISTON. THE CONNECTING ROD DAMAGED THE INTERNAL PORTIONS OF THE ENGINE CASE IN ITS PLANE OF ROTATION AND BY JAMMING INTO THE CASE CAUSED THE ENGINE TO STOP ROTATING.
Flight
Event TypeAccident
Event Time20:30 AKDT
Nearest Airport0nm N
Runway0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftCessna 206
Tail NumberN7560G
Aircraft CategoryAir
DamageSubstantial
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsContinental · IO-520-F · Reciprocating · 300
Seats6
People & Injuries
Injury Summary1 injury (1 serious injury), 1 uninjured
Fatal0
Serious1
Minor0
Uninjured1
Total2
Crew 1Age 65 · Third Class
Conditions
ConditionsVMC
LightDaylight
WindCalm
Visibility30 sm
CeilingNone
Temperature / Dew Point0 C
Altimeter0
Weather SourcePILO