Incident at 70 NM W of Saskatoon, SK


1999-03-25: NWA 1023, a DC-9, was enroute from Minneapolis to Edmonton and when the a/c was about 70 miles west of Saskatoon, it was observed to descend from FL 350 to FL 345 and then climb back to FL 350. When queried, the crew said that they were responding to a TCAS advisory. NavCanada reported that there was no traffic within an 80 mile radius of the a/c and no other a/c at FL 350. OPI - System Safety UPDATE TSB reported that the crew received a TCAS TA which was then followed by an RA to descend. The Captain followed the RA and descended 500 feet where a clear of conflict message was recieved. The crew saw no other traffic and climbed back to FL 350.


CADORS Number 1999C0135
Occurrence Type Incident
Reported By NAV CANADA
Occurred At 1999-02-25 - 05:50
Day or Night?
Fatalities 0
Aerodrome ID
Aerodrome Name
Geographic Location Saskatchewan, Canada, North America, Prairie and Northern Region, 70 NM W of Saskatoon, SK
TSB Occurrence Number
TSB Class of Investigation
AOR Number
Reported By NAV CANADA
Categories Airprox/TCAS alert/loss of separation/(near) midair collisions

Aircraft Details (1 aircraft)

Type Aeroplane
 Silhouette image of Aeroplane
Canadian Registration
Foreign Registration
Country of Registration Canada
Occurrence Type Incident
Operator Commercial
Make  Silhouette image of DOUGLAS
Model DC 9 31
Year Built 1968
Engine Type Turbo fan
Engine Make
Engine Model
Gear Type Land
Private No
Amateur Built No
Flight Number NWA 1023
Flight Rule
CARS Subpart
Phase of Flight Cruise
Damage Unknown
Fatalities 0
Injuries 0
Events TCAS alert

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