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Air carrier X TCASII TA RA in holding pattern had less than standard separation from air carrier Y. Evasive action taken. System error.
| Attributes | |
| ACN | 246480 |
| Time | |
| Date | 199307 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : mei |
| State Reference | MS |
| Altitude | msl bound lower : 33000 msl bound upper : 33000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zme tower : tul |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Widebody, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 90 flight time total : 8000 flight time type : 1000 |
| ASRS Report | 246480 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 100 flight time total : 8100 flight time type : 800 |
| ASRS Report | 246735 |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure non adherence : required legal separation |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other controllera |
| Resolutory Action | controller : issued new clearance flight crew : took evasive action other |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 18000 vertical : 800 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Air carrier X en route dfw-atl, FL330. Instructed to hold at mei. On initial outbound turn to heading 300 degrees, we got a TA, target at 12 O'clock, altitude FL330, 10 mi separation. Other aircraft was instructed to turn south, we were instructed to turn to 360 degrees. We got an RA to descend, we did so to 32400. Air carrier Y was climbing and turning. Estimate 800 ft separation, and 2-3 mi lateral. Probably not a good idea to hold at en route altitude at en route fix. Supplemental information from acn 246735: the captain commenced the instructed descent (from the TA). He saw the other widebody transport and descended to about 32500. The other widebody transport climbed and turned.
Original NASA ASRS Text
Title: ACR X TCASII TA RA IN HOLDING PATTERN HAD LTSS FROM ACR Y. EVASIVE ACTION TAKEN. SYS ERROR.
Narrative: ACR X ENRTE DFW-ATL, FL330. INSTRUCTED TO HOLD AT MEI. ON INITIAL OUTBOUND TURN TO HDG 300 DEGS, WE GOT A TA, TARGET AT 12 O'CLOCK, ALT FL330, 10 MI SEPARATION. OTHER ACFT WAS INSTRUCTED TO TURN S, WE WERE INSTRUCTED TO TURN TO 360 DEGS. WE GOT AN RA TO DSND, WE DID SO TO 32400. ACR Y WAS CLBING AND TURNING. ESTIMATE 800 FT SEPARATION, AND 2-3 MI LATERAL. PROBABLY NOT A GOOD IDEA TO HOLD AT ENRTE ALT AT ENRTE FIX. SUPPLEMENTAL INFO FROM ACN 246735: THE CAPT COMMENCED THE INSTRUCTED DSCNT (FROM THE TA). HE SAW THE OTHER WDB AND DSNDED TO ABOUT 32500. THE OTHER WDB CLBED AND TURNED.
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.