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A320 crew report a loss of separation occurred at FL370 near mcb when ATC requested a hard right 90 degree turn. The crew also received a TCASII TA and visually idented the traffic.
| Attributes | |
| ACN | 629292 |
| Time | |
| Date | 200408 |
| Day | Tue |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : zhu.artcc |
| State Reference | TX |
| Altitude | msl single value : 37000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zhu.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | A320 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zhu.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 11000 flight time type : 7000 |
| ASRS Report | 629292 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | conflict : airborne critical non adherence : required legal separation |
| Independent Detector | atc equipment other atc equipment : radar mode c aircraft equipment : tcas other controllera other flight crewa other flight crewb |
| Resolutory Action | controller : issued new clearance flight crew : took evasive action |
| Miss Distance | horizontal : 15000 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Over mcb at FL370, was told by ATC to make a 'hard' right turn to heading of 190 degrees (from heading of 100 degrees). 1/2 way through the turn, TCASII reacted with a TA on air carrier Y no more than 3 to 4 mi away. When I heard 'hard right,' I turned off the autoplt to increase the rate of turn. When the TA triggered, I manually climbed the aircraft to FL372. When the conflicting aircraft was visually idented and determination was made that no conflict existed, I descended back to FL370 and turned the autoplt back on. Shortly after, we were given on course by ATC.
Original NASA ASRS Text
Title: A320 CREW RPT A LOSS OF SEPARATION OCCURRED AT FL370 NEAR MCB WHEN ATC REQUESTED A HARD R 90 DEG TURN. THE CREW ALSO RECEIVED A TCASII TA AND VISUALLY IDENTED THE TFC.
Narrative: OVER MCB AT FL370, WAS TOLD BY ATC TO MAKE A 'HARD' R TURN TO HDG OF 190 DEGS (FROM HDG OF 100 DEGS). 1/2 WAY THROUGH THE TURN, TCASII REACTED WITH A TA ON ACR Y NO MORE THAN 3 TO 4 MI AWAY. WHEN I HEARD 'HARD R,' I TURNED OFF THE AUTOPLT TO INCREASE THE RATE OF TURN. WHEN THE TA TRIGGERED, I MANUALLY CLBED THE ACFT TO FL372. WHEN THE CONFLICTING ACFT WAS VISUALLY IDENTED AND DETERMINATION WAS MADE THAT NO CONFLICT EXISTED, I DSNDED BACK TO FL370 AND TURNED THE AUTOPLT BACK ON. SHORTLY AFTER, WE WERE GIVEN ON COURSE BY ATC.
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.