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NTSB Report
August 25, 1991 · Cessna T-207A · N73762
Coville Lake, AK
Overview
Report Status
Probable Cause
Event Type
Accident
Date
August 25, 1991
Injury Outcomes
No injuries (1 uninjured)
Location
Coville Lake, AK
Aircraft
Cessna T-207A
Tail Number
N73762
Operator
Katmai Air
Injuries
None
Aircraft Damage
Substantial
NTSB Number
ANC91LA134
AFTER AN EMERGENCY LANDING ON A SMALL LAKE, THE AIRPLANE WAS SUBSTANTIALLY DAMAGED AND THE PILOT WAS NOT INJURED. EXAMINATION OF THE ENGINE REVEALED THE DRIVE SHAFT HAD BECOME DISCONNECTED FROM THE ENGINE DURING FLIGHT. FOUR OF THE FIVE DRIVE SHAFT COUPLING BOLTS FAILED DUE TO FATIGUE.
NTSB Probable Cause
A TOTAL FAILURE OF THE POWER OUTPUT SHAFT BOLTS DUE TO FATIGUE. CONTRIBUTING TO THE ACCIDENT WAS THE ROUGH AND UNEVEN TERRAIN.
Full Narrative
AFTER AN EMERGENCY LANDING ON A SMALL LAKE, THE AIRPLANE WAS SUBSTANTIALLY DAMAGED AND THE PILOT WAS NOT INJURED. EXAMINATION OF THE ENGINE REVEALED THE DRIVE SHAFT HAD BECOME DISCONNECTED FROM THE ENGINE DURING FLIGHT. FOUR OF THE FIVE DRIVE SHAFT COUPLING BOLTS FAILED DUE TO FATIGUE.
Flight
Event TypeAccident
Event Time20:50 AKDT
Nearest Airport0nm N
Runway0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftCessna T-207A
Tail NumberN73762
Aircraft CategoryAir
DamageSubstantial
OperatorKatmai Air
Operating RulePart 91
Engines1
Engine TypeTurboprop
Engine DetailsAllison · 250-C-205 · Turboprop · 425
Seats8
People & Injuries
Injury SummaryNo injuries (1 uninjured)
Fatal0
Serious0
Minor0
Uninjured1
Total1
Crew 1Age 45 · Second Class
Conditions
ConditionsVMC
LightDaylight
Wind300° @ 10 kt
Visibility10 sm
CeilingNone
Temperature / Dew Point64 F / 0 C
Altimeter30.00 inHg
Weather SourcePILO