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NTSB Report
July 9, 1990 · Cessna TU206G · N4784U
Sheridan, OR
Overview
Report Status
Probable Cause
Event Type
Accident
Date
July 9, 1990
Injury Outcomes
No injuries (2 uninjured)
Location
Sheridan, OR
Aircraft
Cessna TU206G
Tail Number
N4784U
Injuries
None
Aircraft Damage
Substantial
NTSB Number
SEA90LA141
AT THE END OF A FLIGHT, WHILE APPROACHING THE AIRPORT, THE PILOT DISCONNECTED THE AUTOPILOT. THE DOWNWIND, BASE AND FINAL LEGS OF THE PATTERN WERE NORMAL, UNTIL WHILE ON SHORT FINAL, THE AIRPLANE SUDDENLY NOSED UP AND BANKED RIGHT. THE PILOT ATTEMPTED TO CORRECT THE SITUATION, HOWEVER, THE RIGHT MAIN LANDING GEAR CONTACTED THE RUNWAY. THE PILOT INITIATED A GO-AROUND AND LANDED AT AN ALTERNATE AIRPORT WITHOUT FURTHER INCIDENT. THE PILOT FELT THAT THE AUTOPILOT SELF ENGAGED ITSELF. TESTING OF THE AUTOPILOT DID NOT REVEAL ANY MECHANICAL FAILURES OR MALFUNCTIONS TO INDICATE A SELF ENGAGEMENT. IT WAS FOUND THAT THE LOCATION OF THE AUTOPILOT IN THE AIRPLANE WAS TWO INCHES LOWER THAN THE STC RECOMMENDED AND THAT THE ENGAGE BUTTON IS IN CLOSE PROXIMITY TO THE FLAP HANDLE AND ENGINE CONTROLS.
NTSB Probable Cause
INADVERTENT ENGAGEMENT OF THE AUTOPILOT DURING THE FLARE FOR LANDING.
Full Narrative
AT THE END OF A FLIGHT, WHILE APPROACHING THE AIRPORT, THE PILOT DISCONNECTED THE AUTOPILOT. THE DOWNWIND, BASE AND FINAL LEGS OF THE PATTERN WERE NORMAL, UNTIL WHILE ON SHORT FINAL, THE AIRPLANE SUDDENLY NOSED UP AND BANKED RIGHT. THE PILOT ATTEMPTED TO CORRECT THE SITUATION, HOWEVER, THE RIGHT MAIN LANDING GEAR CONTACTED THE RUNWAY. THE PILOT INITIATED A GO-AROUND AND LANDED AT AN ALTERNATE AIRPORT WITHOUT FURTHER INCIDENT. THE PILOT FELT THAT THE AUTOPILOT SELF ENGAGED ITSELF. TESTING OF THE AUTOPILOT DID NOT REVEAL ANY MECHANICAL FAILURES OR MALFUNCTIONS TO INDICATE A SELF ENGAGEMENT. IT WAS FOUND THAT THE LOCATION OF THE AUTOPILOT IN THE AIRPLANE WAS TWO INCHES LOWER THAN THE STC RECOMMENDED AND THAT THE ENGAGE BUTTON IS IN CLOSE PROXIMITY TO THE FLAP HANDLE AND ENGINE CONTROLS.
Flight
Event TypeAccident
Event Time11:00 PDT
Nearest AirportSHERIDAN (0nm N)
Runway7
Runway Length2880 ft
Runway Width30 ft
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftCessna TU206G
Tail NumberN4784U
Aircraft CategoryAir
DamageSubstantial
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsContinental · TSIO-520-M · Reciprocating · 310
Seats6
People & Injuries
Injury SummaryNo injuries (2 uninjured)
Fatal0
Serious0
Minor0
Uninjured2
Total2
Crew 1Age 45 · Second Class
Conditions
ConditionsVMC
LightDaylight
WindCalm
Visibility30 sm
CeilingNone
Temperature / Dew Point70 F / 0 C
Altimeter0
Observation Time11:00
Weather SourcePILO