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NTSB Report
June 6, 1986 · Cessna 207 · N1737U
Manokotak, AK
Overview
Report Status
Preliminary report
Event Type
Incident
Date
June 6, 1986
Injury Outcomes
No injuries (6 uninjured)
Location
Manokotak, AK
Aircraft
Cessna 207
Tail Number
N1737U
Operator
Yute Air Alaska
Injuries
None
Aircraft Damage
Minor
NTSB Number
ANC86IA066
DURING CRUISE FLIGHT THE ENGINE BEGAN TO RUN ROUGH. THE PILOT ATTEMPTED SWITCHING FUEL TANKS BUT THE ENGINE CONTINUED TO RUN ROUGH. THE ENGINE CEASED OPERATION AND DID NOT WINDMILL DURING THE EMERGENCY DESCENT. AN EXAMINATION OF THE ENGINE LATER REVEALED THAT THE CRANKSHAFT HAD FRACTURED IN THE VICINITY OF THE NUMBER 2 AND 3 CRANKSHAFT JOURNAL. THE MODE OF FRACTURE WAS NOT DETERMINED. AN OFF ARPT FORCED LNDG WAS ACCOMPLISHED WITHOUT FURTHER INCIDENT.
Full Narrative
DURING CRUISE FLIGHT THE ENGINE BEGAN TO RUN ROUGH. THE PILOT ATTEMPTED SWITCHING FUEL TANKS BUT THE ENGINE CONTINUED TO RUN ROUGH. THE ENGINE CEASED OPERATION AND DID NOT WINDMILL DURING THE EMERGENCY DESCENT. AN EXAMINATION OF THE ENGINE LATER REVEALED THAT THE CRANKSHAFT HAD FRACTURED IN THE VICINITY OF THE NUMBER 2 AND 3 CRANKSHAFT JOURNAL. THE MODE OF FRACTURE WAS NOT DETERMINED. AN OFF ARPT FORCED LNDG WAS ACCOMPLISHED WITHOUT FURTHER INCIDENT.
Flight
Event TypeIncident
Event Time13:15 AKDT
Nearest Airport0nm N
Runway0
Runway Length0
Runway Width0
Flight Plan FiledCvfr
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftCessna 207
Tail NumberN1737U
Aircraft CategoryAir
DamageMinor
OperatorYute Air Alaska
Operating RulePart 135
Engines1
Engine TypeReciprocating
Engine DetailsContinental · 10-520-F · Reciprocating · 300
Seats6
People & Injuries
Injury SummaryNo injuries (6 uninjured)
Fatal0
Serious0
Minor0
Uninjured6
Total6
Crew 1Age 38 · First Class
Conditions
ConditionsVMC
LightDaylight
Wind80° @ 10 kt, gusting 21 kt
Visibility25 sm
CeilingBroken clouds 12000 ft
Temperature / Dew Point50 / 34 C
Altimeter29.00 inHg
Weather SourcePILO