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NTSB Report
October 10, 1988 · Cessna 207 · N9965M
Perde Bay, AK
Overview
Report Status
Preliminary report
Event Type
Accident
Date
October 10, 1988
Injury Outcomes
No injuries (5 uninjured)
Location
Perde Bay, AK
Aircraft
Cessna 207
Tail Number
N9965M
Operator
Cape Smyth Air Services
Injuries
None
Aircraft Damage
Substantial
NTSB Number
ANC89LA007
THE PILOT EXPERIENCED A POWER LOSS DURING CRUISE FLIGHT AND DURING HIS DESCENT THE ENGINE STOPPED PRODUCING POWER. HE LANDED ON THE TUNDRA AND THE AIRPLANE WAS SUBSTANTIALLY DAMAGED. AN ENGINE TEARDOWN REVEALED THAT THE NUMBER 4 PISTON WAS BURNED PAST COMPRESSION RING, WHICH PRESSURIZED THE CASE AND FORCED THE OIL OUT. THE ENG THEN SEIZED.
Full Narrative
THE PILOT EXPERIENCED A POWER LOSS DURING CRUISE FLIGHT AND DURING HIS DESCENT THE ENGINE STOPPED PRODUCING POWER. HE LANDED ON THE TUNDRA AND THE AIRPLANE WAS SUBSTANTIALLY DAMAGED. AN ENGINE TEARDOWN REVEALED THAT THE NUMBER 4 PISTON WAS BURNED PAST COMPRESSION RING, WHICH PRESSURIZED THE CASE AND FORCED THE OIL OUT. THE ENG THEN SEIZED.
Flight
Event TypeAccident
Event Time10:36 AKDT
Nearest Airport0nm N
Runway0
Runway Length0
Runway Width0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftCessna 207
Tail NumberN9965M
Aircraft CategoryAir
DamageSubstantial
OperatorCape Smyth Air Services
Operating RulePart 135
Engines1
Engine TypeReciprocating
Engine DetailsContinental · IO-520 · Reciprocating · 300
Seats5
People & Injuries
Injury SummaryNo injuries (5 uninjured)
Fatal0
Serious0
Minor0
Uninjured5
Total5
Crew 1Age 31 · First Class
Conditions
ConditionsVMC
LightDaylight
Wind300° @ 5 kt
Visibility10 sm
CeilingOvercast 1500 ft
Temperature / Dew Point5 C / 0 C
Altimeter0
Weather SourcePILO