Incident at Calgary, AB (Communication navigation surveillance/air traffic system)


1999-03-17: While vectoring an a/c to Runway 16 at Calgary International Airport, the Terminal Controller lost the 125.9 frequency for about one minute before normal operations could be restored. During this period, one a/c went through the localizer and flew into an area where the minimum radar vectoring altitude was 5,400 feet ASL and the crew's assigned altitude was 5,000 feet ASL. There was no loss of separation and the Controller was able to get the a/c back to a safe altitude area before it had gone 5 miles off course. There were 5 other a/c in the TCU on vectors when the comm failure occurred. This type of occurrence has happened in the past and in fact happened the next day. NavCanada technicians have been informed and are looking into the problem. OPI - ANS and Airspace


CADORS Number 1999C0193
Occurrence Type Incident
Reported By NAV CANADA
Occurred At 1999-03-15 - 03:05
Day or Night?
Fatalities 0
Aerodrome ID
Aerodrome Name
Geographic Location Alberta, Canada, North America, Prairie and Northern Region, Calgary, AB
TSB Occurrence Number
TSB Class of Investigation
AOR Number
Reported By NAV CANADA
Categories ATM/CNS
Events Communication navigation surveillance/air traffic system

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