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Flight crew of an large transport aircraft took evasive action in response to a TCASII RA and turned off assigned heading. Less than standard separation.
| Attributes | |
| ACN | 260854 |
| Time | |
| Date | 199401 |
| Day | Tue |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : mod |
| State Reference | CA |
| Altitude | msl bound lower : 24000 msl bound upper : 28000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zoa tower : dfw |
| Operator | common carrier : air carrier |
| Make Model Name | B727 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| 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 : captain oversight : pic |
| Qualification | pilot : instrument pilot : flight engineer pilot : commercial pilot : atp pilot : private |
| Experience | flight time last 90 days : 100 flight time total : 12000 flight time type : 8000 |
| ASRS Report | 260854 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure non adherence : required legal separation other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other controllera other flight crewa |
| Resolutory Action | controller : issued new clearance flight crew : took evasive action other |
| Consequence | faa : reviewed incident with flight crew |
| Miss Distance | horizontal : 12000 vertical : 0 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
We had been cleared to and were descending to FL240 from FL310. Descending through FL280 TCASII gave a TA at FL270 approximately 10 mi this changed to an RA at the same time center asked if we were descending to FL280. We replied negative, descending to FL240 we made a 90 degree left turn to miss other aircraft. Other aircraft after stated he had us in sight and no real problem existed. We were then cleared to continue to FL240. I talked with oak ARTCC area administrator upon landing and he stated we had been cleared to FL240 and had read back same. He also stated there had been a controller/software error. There was little or no time to respond to the TCASII RA and our evasive action was partially based on the first officer's visual sighting.
Original NASA ASRS Text
Title: FLC OF AN LGT ACFT TOOK EVASIVE ACTION IN RESPONSE TO A TCASII RA AND TURNED OFF ASSIGNED HDG. LTSS.
Narrative: WE HAD BEEN CLRED TO AND WERE DSNDING TO FL240 FROM FL310. DSNDING THROUGH FL280 TCASII GAVE A TA AT FL270 APPROX 10 MI THIS CHANGED TO AN RA AT THE SAME TIME CTR ASKED IF WE WERE DSNDING TO FL280. WE REPLIED NEGATIVE, DSNDING TO FL240 WE MADE A 90 DEG L TURN TO MISS OTHER ACFT. OTHER ACFT AFTER STATED HE HAD US IN SIGHT AND NO REAL PROB EXISTED. WE WERE THEN CLRED TO CONTINUE TO FL240. I TALKED WITH OAK ARTCC AREA ADMINISTRATOR UPON LNDG AND HE STATED WE HAD BEEN CLRED TO FL240 AND HAD READ BACK SAME. HE ALSO STATED THERE HAD BEEN A CTLR/SOFTWARE ERROR. THERE WAS LITTLE OR NO TIME TO RESPOND TO THE TCASII RA AND OUR EVASIVE ACTION WAS PARTIALLY BASED ON THE FO'S VISUAL SIGHTING.
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.