Last updated: 23 January 2017
Descripción: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.
|Fecha:||jueves 22 mayo 2003|
de Havilland Canada DHC-3 Otter
|Operador:||Whiteshell Air Service|
|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|
|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|
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:FINDINGS AS TO CAUSES AND CONTRIBUTING FACTORS:
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.