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ZNY controller described a potential conflict event when traffic was very slow in descent failing to notify ATC that the aircraft had responded to a TCAS event; the reporter suggesting TCAS parameters need to be reviewed.
| Attributes | |
| ACN | 903403 |
| Time | |
| Date | 201008 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZNY.ARTCC |
| State Reference | NY |
| Aircraft 1 | |
| Make Model Name | Falcon 2000 |
| Flight Phase | Descent |
| Route In Use | Vectors |
| Flight Plan | IFR |
| Person 1 | |
| Qualification | Air Traffic Control Fully Certified |
| Events | |
| Anomaly | ATC Issue All Types Conflict Airborne Conflict Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Clearance |
Narrative:
Aircraft X was turned 25 degrees right so he could be descended around traffic. I descended him from FL290 to fl 240. He was told to expedite his descent through FL270. When he was clear I put him back on course; but noticed he was not expediting his descent. I climbed ;expedited; a B763 on J95 from FL280 up to FL300 because I noticed aircraft X was only doing 100 feet a hit in the descent. I proceeded to turn the B763 to a 240 heading to avoid the traffic. I asked aircraft X if he was expediting his descent and he said yes; 2200 feet a minute; he was doing the whole time. I couldn't understand why it didn't work until; aircraft X told me he had a climb as a result of an RA. This situation was dangerous due to the fact that the RA actually cause the event. If the pilot descended the rate he said; pilot deviation; it wouldn't of happened. Why would the pilot get a RA with 4 or 5 miles. The pilot didn't tell me he was climbing until after I climbed the B763. I felt as though this could have been avoided if the pilot descended promptly and the TCAS parameters were set 3 or less. Recommendation; the TCAS parameters should be set 3 miles or less. If the pilot had told me he was climbing I wouldn't have climbed the B763. He didn't tell me he was climbing until I asked about it.
Original NASA ASRS Text
Title: ZNY Controller described a potential conflict event when traffic was very slow in descent failing to notify ATC that the aircraft had responded to a TCAS event; the reporter suggesting TCAS parameters need to be reviewed.
Narrative: Aircraft X was turned 25 degrees right so he could be descended around traffic. I descended him from FL290 to FL 240. He was told to expedite his descent through FL270. When he was clear I put him back on course; but noticed he was not expediting his descent. I climbed ;expedited; a B763 on J95 from FL280 up to FL300 because I noticed Aircraft X was only doing 100 feet a hit in the descent. I proceeded to turn the B763 to a 240 heading to avoid the traffic. I asked Aircraft X if he was expediting his descent and he said yes; 2200 feet a minute; he was doing the whole time. I couldn't understand why it didn't work until; Aircraft X told me he had a climb as a result of an RA. This situation was dangerous due to the fact that the RA actually cause the event. If the pilot descended the rate he said; pilot deviation; it wouldn't of happened. Why would the pilot get a RA with 4 or 5 miles. The pilot didn't tell me he was climbing until after I climbed the B763. I felt as though this could have been avoided if the pilot descended promptly and the TCAS parameters were set 3 or less. Recommendation; the TCAS parameters should be set 3 miles or less. If the pilot had told me he was climbing I wouldn't have climbed the B763. He didn't tell me he was climbing until I asked about it.
Data retrieved from NASA's ASRS site as of April 2012 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.