Accident at 2 NM E of Scandia Alberta

Summary

2001-07-11: The pilot of C-GQWW, an Air Tractor, had completed a spray run over a field of potatos near Brooks, AB when he felt strong vibration in the engine, followed by a loss of power and oil on the windshield. He dumped his 350 gallon load of pesticide and the a/c ballooned about 100 feet as the pilot began looking for a place to land. There was a swampy area ahead of the a/c, so the pilot attempted to turn and land in the potato field. Just as he completed the turn, the a/c pancaked into the wet, muddy field and overturned. The pilot was not injured, but the a/c is reported to be substantially damaged. The owner will recover the a/c and take it to the base at the Brooks airport when he is able to get a vehicle into the site. The engine will be examined for the cause of the failure.
2001-07-16: UPDATE Maintenance and Manufacturing reported that the PRM of the company advised that the engine failure was caused by No. 2 cylinder failure, due to the failure of the rocker arm pivot pin. Further investigation is continuing and an SDR will be submitted.
2014-12-15: Update: TSB Report #A01W0166: The pilot was nearing the end of his second spray swath of the day, on a potato field 2 NM E of Scandia, when the engine (P & W R1340) on the Air Tractor AT-401B began to vibrate excessively. This was followed by a loss of power and oil leaking onto the windshield. He released the 350 gallon load of chemical, and as the aircraft ballooned to approximately 100 feet above ground, he initiated a 180 degree turn to avoid a marsh area ahead of him, and to set up for a forced landing onto the potato field. The aircraft stalled during the turn and pancaked onto the field. The field had been recently irrigated and the aircraft nosed over on touchdown, due to the muddy surface, and came to rest inverted. The aircraft sustained substantial damage and the pilot sustained minor injury to his left hand. Examination determined that the rocker arm support housing for the exhaust valve rocker arm assembly on the number 2 cylinder had failed and separated from the engine. The engine and cylinder had accumulated 538 hours total time since overhaul.
2001-07-13: UPDATE TSB reported that examination of the engine determined that the rocker arm support housing for the exhaust valve rocker arm assembly on the number 2 cylinder had failed and separated from the engine. The engine and cylinder had accumulated 538 hours total time since overhaul.

Details


CADORS Number 2001C0797
Occurrence Type Accident
Reported By Search and Rescue
Occurred At 2001-07-10 - 13:30
Day or Night? Day-time
Fatalities 0
Injuries 1
Aerodrome ID
Aerodrome Name
Geographic Location Alberta, Canada, North America, Prairie and Northern Region, 2 NM E of Scandia Alberta
TSB Occurrence Number A01W0166
TSB Class of Investigation Class 5
AOR Number
Reported By Search and Rescue
Categories System/component failure or malfunction [powerplant],Other,Loss of control - ground
Events



Aircraft Details (1 aircraft)

Type Aeroplane
 Silhouette image of Aeroplane
Canadian Registration GQWW | Flightaware (Registration) | Flightaware (Tracking) | AvHerald
Foreign Registration
Country of Registration Canada
Occurrence Type Accident
Owner QUIKWAY AIR SERVICES INC
Operator Commercial
Make AIR TRACTOR
Model AT 401B
Year Built 1995
Engine Type Reciprocating
Engine Make PRATT & WHITNEY
Engine Model R-1340-AN-1
Gear Type Land
Private No
Amateur Built No
Flight Number
Flight Rule
CARS Subpart
Phase of Flight Cruise
Damage Substantial
Fatalities 0
Injuries 1
Events Forced landing,Engine failure,Overturn

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