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Air carrier X TCASII RA descend non adherence to ATC instruction radar vector turn had less than standard separation from aircraft Y. System error.
| Attributes | |
| ACN | 237475 |
| Time | |
| Date | 199303 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : rod |
| State Reference | OH |
| Altitude | msl bound lower : 33000 msl bound upper : 33000 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid artcc : zid |
| Operator | common carrier : air carrier |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | cruise other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| 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 radar : 3 |
| ASRS Report | 237475 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : clearance 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 |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 24000 vertical : 1000 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Pilot Deviation Operational Error |
Narrative:
Air carrier X was turned left for traffic. Air carrier X was turned back to the right for additional traffic. Air carrier X was advised to make tight turn to avoid separation error. Air carrier X advised he was receiving TCASII alert. I advised air carrier X again to turn right. Air carrier X responded he was descending (in response to TCASII) and turning. It is my understanding that TCASII is a device for collision avoidance and not separation avoidance. Air carrier X and aircraft Y would have always been at least 3 mi apart laterally. I believe that I might have had the 5 mi separation I needed had it not been for TCASII. I also believe it is a very dangerous trend for TCASII to be separating aircraft and the controller's instructions are ignored.
Original NASA ASRS Text
Title: ACR X TCASII RA DSND NON ADHERENCE TO ATC INSTRUCTION RADAR VECTOR TURN HAD LTSS FROM ACFT Y. SYS ERROR.
Narrative: ACR X WAS TURNED L FOR TFC. ACR X WAS TURNED BACK TO THE R FOR ADDITIONAL TFC. ACR X WAS ADVISED TO MAKE TIGHT TURN TO AVOID SEPARATION ERROR. ACR X ADVISED HE WAS RECEIVING TCASII ALERT. I ADVISED ACR X AGAIN TO TURN R. ACR X RESPONDED HE WAS DSNDING (IN RESPONSE TO TCASII) AND TURNING. IT IS MY UNDERSTANDING THAT TCASII IS A DEVICE FOR COLLISION AVOIDANCE AND NOT SEPARATION AVOIDANCE. ACR X AND ACFT Y WOULD HAVE ALWAYS BEEN AT LEAST 3 MI APART LATERALLY. I BELIEVE THAT I MIGHT HAVE HAD THE 5 MI SEPARATION I NEEDED HAD IT NOT BEEN FOR TCASII. I ALSO BELIEVE IT IS A VERY DANGEROUS TREND FOR TCASII TO BE SEPARATING ACFT AND THE CTLR'S INSTRUCTIONS ARE IGNORED.
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.