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TCASII logic air carrier X TCASII RA non adherence to ATC clearance had less than standard separation from air carrier Y. Evasive action taken. Pilot deviation.
| Attributes | |
| ACN | 268645 |
| Time | |
| Date | 199404 |
| Day | Sun |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : dqo |
| State Reference | DE |
| Altitude | msl bound lower : 19000 msl bound upper : 20000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdc |
| Operator | common carrier : air carrier |
| Make Model Name | Fokker 100 |
| Operating Under FAR Part | Part 121 |
| 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 | B757 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| 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 radar : 21 |
| ASRS Report | 268645 |
| 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 : 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 other |
| Consequence | Other |
| Miss Distance | horizontal : 15000 vertical : 200 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Air carrier X was direct to dqo climbing out of FL170 for FL190. Air carrier Y was proceeding to dqo on the nanci 5 arrival descending to FL200, traffic was called to both aircraft. Approaching FL190 air carrier X informed me he was getting an RA. I again called the traffic which was now levelling at FL200. X informed me he was responding to the RA and was climbing. I again called traffic to air carrier Y who said he had the clber in sight. Air carrier Y was turned right to avoid the clber. Air carrier X then reported his RA was over. I informed him to report reaching his assigned altitude FL190. It is my opinion that TCASII took a safe situation and turned it into a potentially critical incident. I am in favor of a TCASII system that works. This incident indicates otherwise.
Original NASA ASRS Text
Title: TCASII LOGIC ACR X TCASII RA NON ADHERENCE TO ATC CLRNC HAD LTSS FROM ACR Y. EVASIVE ACTION TAKEN. PLTDEV.
Narrative: ACR X WAS DIRECT TO DQO CLBING OUT OF FL170 FOR FL190. ACR Y WAS PROCEEDING TO DQO ON THE NANCI 5 ARR DSNDING TO FL200, TFC WAS CALLED TO BOTH ACFT. APCHING FL190 ACR X INFORMED ME HE WAS GETTING AN RA. I AGAIN CALLED THE TFC WHICH WAS NOW LEVELLING AT FL200. X INFORMED ME HE WAS RESPONDING TO THE RA AND WAS CLBING. I AGAIN CALLED TFC TO ACR Y WHO SAID HE HAD THE CLBER IN SIGHT. ACR Y WAS TURNED R TO AVOID THE CLBER. ACR X THEN RPTED HIS RA WAS OVER. I INFORMED HIM TO RPT REACHING HIS ASSIGNED ALT FL190. IT IS MY OPINION THAT TCASII TOOK A SAFE SIT AND TURNED IT INTO A POTENTIALLY CRITICAL INCIDENT. I AM IN FAVOR OF A TCASII SYS THAT WORKS. THIS INCIDENT INDICATES OTHERWISE.
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.