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Near midair collision averted due to TCASII RA and resultant altitude deviation altitude excursion during evasive action climb by reporter.
| Attributes | |
| ACN | 200526 |
| Time | |
| Date | 199201 |
| Day | Thu |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : yyz |
| State Reference | ON |
| Altitude | msl bound lower : 4000 msl bound upper : 4500 |
| Environment | |
| Flight Conditions | IMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tracon : yyz |
| Operator | common carrier : air carrier |
| Make Model Name | Widebody, Low Wing, 3 Turbojet Eng |
| Flight Phase | cruise other other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | cruise other |
| Route In Use | departure other enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 15000 flight time type : 1500 |
| ASRS Report | 200526 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude non adherence : clearance non adherence other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified |
| Resolutory Action | flight crew : took evasive action |
| Consequence | faa : reviewed incident with flight crew |
| Miss Distance | horizontal : 0 vertical : 500 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation other |
Narrative:
While level at 4000 ft on downwind vector for landing on 24R at toronto, we received a climb RA from TCASII. We immediately climbed and shortly got a visual on aircraft lights passing beneath us. We reported to approach control that we had climbed to resolve a traffic conflict and asked the altitude of the other aircraft. After querying the other aircraft, they responded, '3000 ft.' since flight visibility was very poor, it is impossible to judge accurately how close we came to the intruder aircraft - but I would guess about 500 ft. We believe that the TCASII was correct in giving a climb RA and that the other aircraft was off it's assigned altitude. If I remember correctly, the toronto altimeter setting was about 29.50 and possibly the intruder had not correctly reset their altimeters.
Original NASA ASRS Text
Title: NMAC AVERTED DUE TO TCASII RA AND RESULTANT ALTDEV ALT EXCURSION DURING EVASIVE ACTION CLB BY RPTR.
Narrative: WHILE LEVEL AT 4000 FT ON DOWNWIND VECTOR FOR LNDG ON 24R AT TORONTO, WE RECEIVED A CLB RA FROM TCASII. WE IMMEDIATELY CLBED AND SHORTLY GOT A VISUAL ON ACFT LIGHTS PASSING BENEATH US. WE RPTED TO APCH CTL THAT WE HAD CLBED TO RESOLVE A TFC CONFLICT AND ASKED THE ALT OF THE OTHER ACFT. AFTER QUERYING THE OTHER ACFT, THEY RESPONDED, '3000 FT.' SINCE FLT VISIBILITY WAS VERY POOR, IT IS IMPOSSIBLE TO JUDGE ACCURATELY HOW CLOSE WE CAME TO THE INTRUDER ACFT - BUT I WOULD GUESS ABOUT 500 FT. WE BELIEVE THAT THE TCASII WAS CORRECT IN GIVING A CLB RA AND THAT THE OTHER ACFT WAS OFF IT'S ASSIGNED ALT. IF I REMEMBER CORRECTLY, THE TORONTO ALTIMETER SETTING WAS ABOUT 29.50 AND POSSIBLY THE INTRUDER HAD NOT CORRECTLY RESET THEIR ALTIMETERS.
Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.