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Last updated: 24 June 2017
Fecha:jueves 22 mayo 2003
Hora:ca 11:00
Tipo:Silhouette image of generic DHC3 model; specific model in this crash may look slightly different
de Havilland Canada DHC-3 Otter
Operador:Whiteshell Air Service
Registración: C-GGON
Numéro de série: 225
Año de Construcción: 1957
Tripulación:Fatalidades: 0 / Ocupantes: 1
Pasajeros:Fatalidades: 0 / Ocupantes: 3
Total:Fatalidades: 0 / Ocupantes: 4
Daños en la Aeronave: Considerable
Consecuencias: Repaired
Ubicación:4 km (2.5 milles) E of Lac du Bonnet, MB (   Canadá)
Fase: Ascenso Inicial (ICL)
Naturaleza:Vuelo Doméstico No Programado
Aeropuerto de Salida:Lac du Bonnet (North) SPB, MB, Canadá
Aeropuerto de Llegada:George Lake, MB, Canadá
A de Havilland Canada DHC-3 Otter, registered C-GGON, sustained substantial damage in an accident 4 km east of Lac du Bonnet, MB, Canada. All three passengers and the pilot survived. The airplane operated on a flight from Lac du Bonnet, MB to George Lake, MB.
The pilot completed a normal takeoff from the Winnipeg River in an easterly direction and began a shallow climb over the shoreline. As the aircraft levelled at approximately 400 feet agl, there was a loud backfire followed by a complete loss of engine power. The pilot force landed straight ahead; the aircraft struck several large trees and came to rest in a swampy area. The aircraft struck the ground on its left side, both wings broke off, and the engine was buried in the swampy ground.

Probable Cause:

1. A spacer in the No. 3 cylinder push rod tube was installed incorrectly. This initiated the increased wear that eventually prevented the No. 3 exhaust valve from opening, resulting in hot exhaust gases migrating into the induction system and causing the engine failure.
2. Following replacement of the No. 1 cylinder, the operator did not complete a field barometric power reference check, which is used in early identification of an engine problem.
3. The valve adjustment screw protrusion was set beyond specified limits. Had the out-of-limits screw protrusion been noted during adjustment or during a scheduled inspection, an examination might have revealed the excessive wear in the valve train and prevented the engine failure.



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