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NTSB Report
November 28, 1992 · Cessna 185 · N20752
Point Hope, AK
Overview
Report Status
Probable Cause
Event Type
Accident
Date
November 28, 1992
Injury Outcomes
No injuries (1 uninjured)
Location
Point Hope, AK
Aircraft
Cessna 185
Tail Number
N20752
Operator
Cape Smythe Air Service
Injuries
None
Aircraft Damage
Substantial
NTSB Number
ANC93LA016
THE ENGINE FAILED ABOUT 5 TO 6 MINUTES AFTER TAKEOFF DURING THE CLIMB TO CRUISE PHASE OF OPERATION. THE PILOT MADE AN OFF AIRPORT FORCED LANDING ON AN ICE FLOW. AT THE TIME OF THE ACCIDENT, THE PART 135 OPERATOR WAS REPOSITIONING THE AIRPLANE UNDER PART 91. THE CAUSE OF THE ENGINE FAILURE WAS TRACED TO A SPUN CRANKSHAFT BEARING WHICH BLOCKED OFF THE OIL HOLE TO THE NO. 2 CYLINDER CONNECTING ROD, RESULTING IN ITS CATASTROPHIC FAILURE. THE SPUN BEARING MOST LIKELY WAS THE RESULT OF EITHER A LOSS OF TORQUE OR INSUFFICIENT TORQUE BEING APPLIED TO THE CRANKCASE THRU STUD BOLTS.
NTSB Probable Cause
THE FAILURE OF THE NO. TWO CYLINDER CONNECTING ROD DUE TO A SLIPPED (SPUN) MAIN CRANKSHAFT BEARING WHICH BLOCKED OFF THE OIL HOLE TO THE CONNECTING ROD. A FACTOR IN THE ACCIDENT WAS THE UNSUITABLE TERRAIN ON WHICH TO PERFORM A FORCED LANDING.
Full Narrative
THE ENGINE FAILED ABOUT 5 TO 6 MINUTES AFTER TAKEOFF DURING THE CLIMB TO CRUISE PHASE OF OPERATION. THE PILOT MADE AN OFF AIRPORT FORCED LANDING ON AN ICE FLOW. AT THE TIME OF THE ACCIDENT, THE PART 135 OPERATOR WAS REPOSITIONING THE AIRPLANE UNDER PART 91. THE CAUSE OF THE ENGINE FAILURE WAS TRACED TO A SPUN CRANKSHAFT BEARING WHICH BLOCKED OFF THE OIL HOLE TO THE NO. 2 CYLINDER CONNECTING ROD, RESULTING IN ITS CATASTROPHIC FAILURE. THE SPUN BEARING MOST LIKELY WAS THE RESULT OF EITHER A LOSS OF TORQUE OR INSUFFICIENT TORQUE BEING APPLIED TO THE CRANKCASE THRU STUD BOLTS.
Flight
Event TypeAccident
Event Time06:23 AKST
Nearest Airport0nm N
Runway0
Flight Plan FiledVFR
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftCessna 185
Tail NumberN20752
Aircraft CategoryAir
DamageSubstantial
OperatorCape Smythe Air Service
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsContinental · IO-520-D · Reciprocating · 300
Seats4
People & Injuries
Injury SummaryNo injuries (1 uninjured)
Fatal0
Serious0
Minor0
Uninjured1
Total1
Crew 1Age 23 · First Class
Conditions
ConditionsVMC
LightDaylight
Wind45° @ 15 kt, gusting 18 kt
Visibility10 sm
CeilingNone
Temperature / Dew Point9 C / 0 C
Altimeter29.00 inHg
Weather SourcePILO