Incident at Thompson, MB (Electrical problem, Communication navigation surveillance/air traffic system)


1999-01-19: The Independent Power Unit (IPU) at Thompson Airport auto-started because of a hydro failure at 0840Z. The IPU continued to run all morning due to a component that the Local Government (LG) knew to be defective, but had not yet replaced. The LG had been waiting for a good-weather, low traffic day to do the repair to minimize operational impact. There were several power "bumps" from 1400-1700Z when LG attempted to disengage and repair the IPU. A bump at 1407Z disabled the MONCO (Monitor Control Unit) for the ILS (except for the localizer monitor). A bump also caused a brief power interruption to the FSS cab at 1730Z. Subsequent pilot reports indicated that the DME Channel 40 was serviceable but the GP (glide path) was unserviceable. A NavCanada technician was called out to the site and with the help of LG staff, all facilities were restored by 1855Z. The local weather was IFR with freezing drizzle most of the morning but the ceilings and visibility did not deteriorate to the point of operational impact, as IFR approaches were conducted without a GP. OPI - Aerodrome Safety UPDATE Aerodrome Safety reported that the standby generator would not shut off due to a faulty circuit breaker that would not re-set itself. It has been removed for repair and a spare breaker installed as a substitute. The power interruption to the FSS after normal line power was restored at 1400Z was due to the airport electrician doing a series of tests. These were conducted during periods of minimal traffic.


CADORS Number 1999C0039
Occurrence Type Incident
Reported By NAV CANADA
Occurred At 1999-01-16 - 17:10
Day or Night?
Fatalities 0
Aerodrome ID
Aerodrome Name
Geographic Location Manitoba, Canada, North America, Prairie and Northern Region, Thompson, MB
TSB Occurrence Number
TSB Class of Investigation
AOR Number
Reported By NAV CANADA
Categories System/component failure or malfunction [non-powerplant],ATM/CNS
Events Electrical problem,Communication navigation surveillance/air traffic system

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