 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
Air carrier medium large transport receives TCASII on previously issued VFR traffic and climbs to resolve possible conflict.
| Attributes | |
| ACN | 192386 |
| Time | |
| Date | 199110 |
| Day | Tue |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : ord |
| State Reference | IL |
| Altitude | msl bound lower : 11000 msl bound upper : 11700 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : ord |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | cruise other descent other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : flight engineer pilot : commercial pilot : instrument pilot : atp |
| Experience | flight time last 90 days : 210 flight time total : 830 flight time type : 78 |
| ASRS Report | 192386 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : clearance |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified |
| Resolutory Action | flight crew : returned to intended course or assigned course |
| Consequence | Other |
| Miss Distance | horizontal : 12000 vertical : 800 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Inbound to O'hare at 11000 ft our TCASII indicated a TA. We looked at the display and began to scan for the target. Center, at about this same time, called a pop up VFR target at 12 O'clock, 2 mi, mode C indicates 10500 ft. Still with no visual acquisition of the target, our TCASII indicated an RA and a command to climb. I initiated an immediate climb while at the same time the copilot told center we were climbing to resolve the conflict. We climbed to approximately 11700 ft when we visually acquired the target off our right wing and also got an all clear from the TCASII. We immediately notified center that we had our target visually and we are descending back to 11000 ft. I don't think we would have had a midair had we not climbed but it would have been very close. TCASII did an excellent job. The system worked. Both our 2 aircraft had the right to be where we were and TCASII prevented a possible midair.
Original NASA ASRS Text
Title: ACR MLG RECEIVES TCASII ON PREVIOUSLY ISSUED VFR TFC AND CLBS TO RESOLVE POSSIBLE CONFLICT.
Narrative: INBOUND TO O'HARE AT 11000 FT OUR TCASII INDICATED A TA. WE LOOKED AT THE DISPLAY AND BEGAN TO SCAN FOR THE TARGET. CENTER, AT ABOUT THIS SAME TIME, CALLED A POP UP VFR TARGET AT 12 O'CLOCK, 2 MI, MODE C INDICATES 10500 FT. STILL WITH NO VISUAL ACQUISITION OF THE TARGET, OUR TCASII INDICATED AN RA AND A COMMAND TO CLB. I INITIATED AN IMMEDIATE CLB WHILE AT THE SAME TIME THE COPLT TOLD CENTER WE WERE CLBING TO RESOLVE THE CONFLICT. WE CLBED TO APPROX 11700 FT WHEN WE VISUALLY ACQUIRED THE TARGET OFF OUR R WING AND ALSO GOT AN ALL CLR FROM THE TCASII. WE IMMEDIATELY NOTIFIED CENTER THAT WE HAD OUR TARGET VISUALLY AND WE ARE DSNDING BACK TO 11000 FT. I DON'T THINK WE WOULD HAVE HAD A MIDAIR HAD WE NOT CLBED BUT IT WOULD HAVE BEEN VERY CLOSE. TCASII DID AN EXCELLENT JOB. THE SYS WORKED. BOTH OUR 2 ACFT HAD THE RIGHT TO BE WHERE WE WERE AND TCASII PREVENTED A POSSIBLE MIDAIR.
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.