Incident at EDMONTON INTL AB (CYEG)
2005-02-10: UPDATE TSB reported that the Air Canada Jazz DHC-8-300, C-GVTA, was en route from Calgary Intl (CYYC) to Ft McMurray, AB (CYMM), as JZA 8373. A number of electrical anomalies occurred, including illumination of the left elevator horn de-ice caution light, and the No. 1 intake heater light. The left transformer rectifier unit (TRU) circuit breaker tripped, and there was no voltage output from the No. 1 AC Gen A phase. Due to weather in the Calgary area, the crew elected to divert the flight to Edmonton Intl (CYEG), where it landed without further incident at 0743 MST. Maintenance determined that a No. 1 propellor-heat brush block had shorted, and was burned. The TRU AC neutral ground wire was burned, and three AC current limiters had blown. The events in this occurrence were consistent with those outlined in Bombardier ISAR 2004-07-2430, published July 13, 2004. Contamination from deicing fluid, engine oil and carbon dust can result in shorting of the propellor-heat brush blocks, and subsequent opening of AC current limiters. Loss of one phase to the TRU can result in excessive current flow through the neutral wire, and overheating of the wire.
2005-02-04: JZA 8373, a DHC-8-300, was en route from Calgary to Fort McMurray when the crew advised Edmonton ACC that they were having icing problems and were diverting to Edmonton. The flight was vectored to Runway 02 and landed safely at 1443Z. No other flights were inconvenienced. TSB will contact the company.
|Occurred At||- 14:25|
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Aircraft Details (1 aircraft)
|Canadian Registration||| Flightaware (Registration) | Flightaware (Tracking) | AvHerald|
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