Incident at WINNIPEG / JAMES ARMSTRONG RICHARDSON INTL MB (CYWG) (Overshoot/missed approach, Conflict - loss of separation, ATS operating irregularity)

Summary

2001-08-08: UPDATE ANS and Airspace reported that NAV CANADA will convene a Fact Finding Board.
2001-07-30: An ATC Operating Irregularity occurred at 1933Z at Winnipeg between WSG 702, a Pilatus PC-12 and CAV 3740, a Saab 340, when longitudinal separation on final approach was reduced to less than 3 miles. CAV 3740 was radar vectored for a straight-in ILS approach to Runway 13 following WSG 702. When CAV 3740 intercepted the localizer at approximately 12 miles final, RDA analysis shows the a/c to be 5 miles behind WSG 702 with similar speeds. Both a/c were changed to the Tower frequency. At 1935Z, the Terminal Controller instructed the Tower Controller to overshoot CAV 3740. Longitudinal separation was reduced to approximately 1 mile with 500 feet vertical separation before CAV 3740 commenced the missed approach. The Winnipeg weather at the time read: SA CYWG 1900Z 15007KT 10SM -RA BKN006 OVC018 17/15 2997 RMK SF6 SC2 SA CYWG 2000Z 16006KT 10SM -RA BKN006 OVC017 17/15 2997 RMK SF6 SC2
2001-08-10: UPDATE TSB reported that WSG 702 was inbound on the ILS to Runway 13 at Winnipeg, and was in radio contact with the Tower Controller. CAV 3740 was also inbound on the ILS for Runway 13, about five miles in trail behind WSG 702, also in radio contact with the Tower Controller. Weather conditions were 600 BKN 1700 OVC and 10 SM visibility. Automatic control transfer was not in effect between the Arrival Controller and Tower Controller, and IFR separation requirements were in effect. The Tower Controller had instructed both flights to reduce speed to enable departures from Runway 13. Radar data analysis showed WSG 702 reduced speed to 80 knots ground speed, and CAV 3740 to 120 knots ground speed. The spacing between the flights reduced to 1.5 NM before CAV 3740 was instructed by the Tower Controller to go around and contact the Arrival Controller for re-sequencing. The separation standard in effect was 3 NM longitudinal spacing between flights. A loss of separation occurred. Nav Canada management has issued a mandatory verbal briefing to be given to all Winnipeg Tower Controllers to ensure they are aware of this occurrence and to heighten their awareness of approved standards and procedures.

Details


CADORS Number 2001C0918
Occurrence Type Incident
Reported By NAV CANADA
Occurred At 2001-07-27 - 19:33
Day or Night? Day-time
Fatalities 0
Injuries
Aerodrome ID CYWG
Aerodrome Name WINNIPEG / JAMES ARMSTRONG RICHARDSON INTL MB (CYWG)
Geographic Location Manitoba, Canada, North America, Prairie and Northern Region, Winnipeg
TSB Occurrence Number A01C0183
TSB Class of Investigation Class 5
AOR Number 16729
Reported By NAV CANADA
Categories Undershoot/overshoot,Airprox/TCAS alert/loss of separation/(near) midair collisions,ATM/CNS
Events Overshoot/missed approach,Conflict - loss of separation,ATS operating irregularity


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