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X descent through occupied altitude had less than standard separation from air carrier Y TCASII RA climb. System error. Evasive action taken.
| Attributes | |
| ACN | 264570 |
| Time | |
| Date | 199402 |
| Day | Sat |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : cot |
| State Reference | TX |
| Altitude | msl bound lower : 33000 msl bound upper : 33000 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zhu |
| Operator | general aviation : corporate |
| Make Model Name | Cessna Citation Undifferentiated or Other Model |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller non radar : 2 controller radar : 1 |
| ASRS Report | 264570 |
| Person 2 | |
| Affiliation | Other |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation non adherence : published procedure non adherence : clearance |
| 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 : 24600 vertical : 100 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Citation jet at FL350, sbound south of sat, requested FL260. X was assigned FL260. In my judgement, X was laterally separated from air carrier Y at FL330 northbound, south of sat. Conflict alert was activated and was then apparent lateral separation did not exist. X assigned 40 degree right turn and climb to FL350. Y issued 40 degree right turn, using wrong call sign, Y, then issued descent to FL310. At this time Y advised responding to TCASII RA and was climbing. This maneuver might have been a factor in losing standard separation.
Original NASA ASRS Text
Title: X DSCNT THROUGH OCCUPIED ALT HAD LTSS FROM ACR Y TCASII RA CLB. SYS ERROR. EVASIVE ACTION TAKEN.
Narrative: CITATION JET AT FL350, SBOUND S OF SAT, REQUESTED FL260. X WAS ASSIGNED FL260. IN MY JUDGEMENT, X WAS LATERALLY SEPARATED FROM ACR Y AT FL330 NBOUND, S OF SAT. CONFLICT ALERT WAS ACTIVATED AND WAS THEN APPARENT LATERAL SEPARATION DID NOT EXIST. X ASSIGNED 40 DEG R TURN AND CLB TO FL350. Y ISSUED 40 DEG R TURN, USING WRONG CALL SIGN, Y, THEN ISSUED DSCNT TO FL310. AT THIS TIME Y ADVISED RESPONDING TO TCASII RA AND WAS CLBING. THIS MANEUVER MIGHT HAVE BEEN A FACTOR IN LOSING STANDARD SEPARATION.
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.