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NTSB Report
October 10, 1989 · Cessna T207A · N7602U
Grand Canyon, AZ
Overview
Report Status
Probable Cause
Event Type
Accident
Date
October 10, 1989
Injury Outcomes
3 injuries (3 serious injuries)
Location
Grand Canyon, AZ
Aircraft
Cessna T207A
Tail Number
N7602U
Operator
Lake Powell Air Service
Injuries
Serious
Aircraft Damage
Destroyed
NTSB Number
LAX90FA007
THE AIRPLANE WAS FLYING A SCENIC TOUR WHEN THERE WAS A LOSS OF ENGINE POWER. THE PILOT SWITCHED FUEL TANKS TO THE FULLEST TANK AND POWER WAS REGAINED MOMENTARILY. THE ENGINE STOPPED. THE PROPELLER DID NOT WINDMILL. THE PILOT ACCOMPLISHED AN OFF AIRPORT LANDING IN RUGGED MOUNTAINOUS TERRAIN. DISASSEMBLY OF THE ENGINE REVEALED THE CRANKSHAFT HAD FRACTURED. EXAMINATION OF THE FRACTURE REVEALED SUBSURFACE METAL FATIGUE.
NTSB Probable Cause
THE INFLIGHT FAILURE OF THE AIRPLANE'S POWERPLANT AS A RESULT METAL FATIGUE WHICH ALLOWED THE CRANKSHAFT TO FRACTURE. CONTRIBUTING TO THE ACCIDENT WAS MOUNTAINOUS TERRAIN OF THE GRAND CANYON WHICH DID NOT ALLOW A SUITABLE FORCED LANDING AREA.
Full Narrative
THE AIRPLANE WAS FLYING A SCENIC TOUR WHEN THERE WAS A LOSS OF ENGINE POWER. THE PILOT SWITCHED FUEL TANKS TO THE FULLEST TANK AND POWER WAS REGAINED MOMENTARILY. THE ENGINE STOPPED. THE PROPELLER DID NOT WINDMILL. THE PILOT ACCOMPLISHED AN OFF AIRPORT LANDING IN RUGGED MOUNTAINOUS TERRAIN. DISASSEMBLY OF THE ENGINE REVEALED THE CRANKSHAFT HAD FRACTURED. EXAMINATION OF THE FRACTURE REVEALED SUBSURFACE METAL FATIGUE.
Flight
Event TypeAccident
Event Time12:42 MST
Nearest Airport0nm N
Runway0
Runway Length0
Runway Width0
Flight Plan FiledCvfr
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftCessna T207A
Tail NumberN7602U
Aircraft CategoryAir
DamageDestroyed
OperatorLake Powell Air Service
Operating RulePart 135
Engines1
Engine TypeReciprocating
Engine DetailsContinental · TSIO-520 · Reciprocating · 310
Seats7
People & Injuries
Injury Summary3 injuries (3 serious injuries)
Fatal0
Serious3
Minor0
Uninjured0
Total3
Crew 1Age 27 · First Class
Conditions
ConditionsVMC
LightDaylight
Wind210° @ 5 kt
Visibility50 sm
CeilingNone
Temperature / Dew Point0 C / 0 C
Altimeter30.00 inHg
Observation Time19:42
Weather SourceWFAC