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MD80 crew detected a conflicting aircraft, on the TCASII display and stopped descent into the other aircraft in ZFW class a airspace.
| Attributes | |
| ACN | 556486 |
| Time | |
| Date | 200208 |
| Day | Wed |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| State Reference | TX |
| Altitude | msl single value : 29500 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zfw.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | MD-80 Super 80 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | descent : intermediate altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zfw.artcc |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | cruise : level |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| ASRS Report | 556486 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 556384 |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : far non adherence : published procedure |
| Independent Detector | atc equipment other atc equipment : radar aircraft equipment : tcas other controllera other flight crewa other flight crewb |
| Resolutory Action | controller : issued new clearance controller : separated traffic flight crew : took precautionary avoidance action |
| Consequence | other |
| Miss Distance | horizontal : 30000 vertical : 500 |
| Supplementary | |
| Problem Areas | Environmental Factor ATC Human Performance |
| Primary Problem | ATC Human Performance |
Narrative:
On arrival to dfw and inbound to the bwd VOR, we were given clearance to descend to FL280. At approximately FL300, we noticed an aircraft on our TCASII that was at our 12:30 O'clock position 700 ft below and closing on our position. We then shallowed our descent to almost zero. At this time, the controller gave us a climb back up to FL310 and to expedite our climb. He also issued a turn to the other aircraft and for him to report descending through FL280. We continued our climb to FL310, and the rest of the flight was uneventful. I do not believe we were ever closer than 500 ft vertically or 5 mi horizontally. TCASII never issued an RA. However, if the controller had not issued corrective actions and the crews of both aircraft had not immediately responded, we could have potentially come close to one another.
Original NASA ASRS Text
Title: MD80 CREW DETECTED A CONFLICTING ACFT, ON THE TCASII DISPLAY AND STOPPED DSCNT INTO THE OTHER ACFT IN ZFW CLASS A AIRSPACE.
Narrative: ON ARR TO DFW AND INBOUND TO THE BWD VOR, WE WERE GIVEN CLRNC TO DSND TO FL280. AT APPROX FL300, WE NOTICED AN ACFT ON OUR TCASII THAT WAS AT OUR 12:30 O'CLOCK POS 700 FT BELOW AND CLOSING ON OUR POS. WE THEN SHALLOWED OUR DSCNT TO ALMOST ZERO. AT THIS TIME, THE CTLR GAVE US A CLB BACK UP TO FL310 AND TO EXPEDITE OUR CLB. HE ALSO ISSUED A TURN TO THE OTHER ACFT AND FOR HIM TO RPT DSNDING THROUGH FL280. WE CONTINUED OUR CLB TO FL310, AND THE REST OF THE FLT WAS UNEVENTFUL. I DO NOT BELIEVE WE WERE EVER CLOSER THAN 500 FT VERTLY OR 5 MI HORIZONTALLY. TCASII NEVER ISSUED AN RA. HOWEVER, IF THE CTLR HAD NOT ISSUED CORRECTIVE ACTIONS AND THE CREWS OF BOTH ACFT HAD NOT IMMEDIATELY RESPONDED, WE COULD HAVE POTENTIALLY COME CLOSE TO ONE ANOTHER.
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.