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ARTCC radar controller intervention after separation lost with descending crossing traffic. Potential conflict less than standard separation.
| Attributes | |
| ACN | 262278 |
| Time | |
| Date | 199401 |
| Day | Mon |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : vxv |
| State Reference | TN |
| Altitude | msl bound lower : 31000 msl bound upper : 32000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : ztl |
| Operator | common carrier : air carrier |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | other : unknown |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 120 flight time total : 8000 flight time type : 120 |
| ASRS Report | 262278 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : cfi pilot : flight engineer |
| Experience | flight time last 90 days : 100 flight time total : 9000 flight time type : 100 |
| ASRS Report | 262470 |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation other anomaly other |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance flight crew : exited adverse environment other |
| Consequence | faa : reviewed incident with flight crew |
| Miss Distance | horizontal : 12000 vertical : 1200 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
| Situations | |
| ATC Facility | other physical facility |
Narrative:
FL330 descending to FL290. ZTL asked us to 'stop at FL320.' at the time we were descending through FL312 got it stopped at FL310. Advised controller that we'd have to climb back to FL320, were told to expedite, we did. Got a TCASII TA with 1200 ft separation, saw other aircraft at 3 O'clock position passing well clear to our 6 O'clock. Called ZTL, they indicated it was their fault. No apology? Supplemental information from acn 262470: we climbed back to FL320 after getting the descent stopped at FL310. He also asked us to turn left 30 degrees. We were alerted to the problem by the TCASII with a TA. At that point we had 1200 ft separation vertically and a couple of mi horizontally.
Original NASA ASRS Text
Title: ARTCC RADAR CTLR INTERVENTION AFTER SEPARATION LOST WITH DSNDING XING TFC. POTENTIAL CONFLICT LTSS.
Narrative: FL330 DSNDING TO FL290. ZTL ASKED US TO 'STOP AT FL320.' AT THE TIME WE WERE DSNDING THROUGH FL312 GOT IT STOPPED AT FL310. ADVISED CTLR THAT WE'D HAVE TO CLB BACK TO FL320, WERE TOLD TO EXPEDITE, WE DID. GOT A TCASII TA WITH 1200 FT SEPARATION, SAW OTHER ACFT AT 3 O'CLOCK POS PASSING WELL CLR TO OUR 6 O'CLOCK. CALLED ZTL, THEY INDICATED IT WAS THEIR FAULT. NO APOLOGY? SUPPLEMENTAL INFORMATION FROM ACN 262470: WE CLBED BACK TO FL320 AFTER GETTING THE DSCNT STOPPED AT FL310. HE ALSO ASKED US TO TURN L 30 DEGS. WE WERE ALERTED TO THE PROB BY THE TCASII WITH A TA. AT THAT POINT WE HAD 1200 FT SEPARATION VERTICALLY AND A COUPLE OF MI HORIZLY.
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.