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Air carrier X assigned climb through occupied altitude with less than standard separation from air carrier Y. System error.
| Attributes | |
| ACN | 230430 |
| Time | |
| Date | 199301 |
| Day | Sat |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : aex |
| State Reference | LA |
| Altitude | msl bound lower : 29700 msl bound upper : 31000 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zhu |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport |
| Navigation In Use | Other Other |
| Flight Phase | cruise other |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller non radar : 9 controller radar : 8 |
| ASRS Report | 230420 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : overshoot conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | Other |
| Miss Distance | horizontal : 14000 vertical : 1200 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
I was the radar controller in charge. I received the radar position. The previous controller advised me of the conflict between air carrier X and air carrier Y. Air carrier X had been assigned FL350 by previous controller. Air carrier Y was wbound at FL310. I advised the controller that I was relieving that I would stop air carrier X at FL280 for the traffic. I issued the clearance to air carrier X to maintain FL280. Air carrier X did not acknowledge and I must have been distracted. I did not catch the missed readback when I noticed air carrier X above the assigned altitude, I advised air carrier X to maintain FL290. Air carrier X acknowledged, the mode C then showed FL297. I asked air carrier X to say altitude. Air carrier X advised level at FL290. Air carrier Y, which was TCASII equipped, did not advise of an RA.
Original NASA ASRS Text
Title: ACR X ASSIGNED CLB THROUGH OCCUPIED ALT WITH LTSS FROM ACR Y. SYS ERROR.
Narrative: I WAS THE RADAR CTLR IN CHARGE. I RECEIVED THE RADAR POS. THE PREVIOUS CTLR ADVISED ME OF THE CONFLICT BTWN ACR X AND ACR Y. ACR X HAD BEEN ASSIGNED FL350 BY PREVIOUS CTLR. ACR Y WAS WBOUND AT FL310. I ADVISED THE CTLR THAT I WAS RELIEVING THAT I WOULD STOP ACR X AT FL280 FOR THE TFC. I ISSUED THE CLRNC TO ACR X TO MAINTAIN FL280. ACR X DID NOT ACKNOWLEDGE AND I MUST HAVE BEEN DISTRACTED. I DID NOT CATCH THE MISSED READBACK WHEN I NOTICED ACR X ABOVE THE ASSIGNED ALT, I ADVISED ACR X TO MAINTAIN FL290. ACR X ACKNOWLEDGED, THE MODE C THEN SHOWED FL297. I ASKED ACR X TO SAY ALT. ACR X ADVISED LEVEL AT FL290. ACR Y, WHICH WAS TCASII EQUIPPED, DID NOT ADVISE OF AN RA.
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.