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Air carrier medium large transport receives TCASII RA and descent command due to climbing traffic. Controller had alerted flight crew to the climbing traffic. Reporter anticipated a TCASII TA due to confused discussion between controller and climbing aircraft. Unknown if flight crew of other aircraft climbed through assigned altitude to cause less than standard separation or less than standard separation was caused by the TCASII RA evasive action descent by reporter.
| Attributes | |
| ACN | 362298 |
| Time | |
| Date | 199703 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : cam |
| State Reference | NY |
| Altitude | msl bound lower : 29000 msl bound upper : 29000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | artcc : zbw |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other |
| Flight Phase | cruise other descent other |
| Route In Use | enroute airway : zbw |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | other : unknown |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : flight engineer pilot : cfi pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 18000 flight time type : 5000 |
| ASRS Report | 362298 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : cfi pilot : atp |
| Experience | flight time last 90 days : 210 flight time total : 13200 flight time type : 3200 |
| ASRS Report | 362442 |
| Events | |
| Anomaly | non adherence : required legal separation other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified |
| Resolutory Action | controller : issued new clearance flight crew : took evasive action |
| Consequence | Other |
| Miss Distance | horizontal : 25200 vertical : 100 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Our flight was in level cruise flight at FL290. Nebound on j- 222, approximately 20 NM south of the cam VORTAC. We were alerted to traffic approaching from our right by ATC. We monitored the traffic on our TCASII unit because we were IMC at the time. We noted that the traffic was climbing at a moderate rate in our direction and we anticipated a possible TA because of the somewhat confused discussion between bos ATC and the other aircraft. We did receive a TCASII TA alert followed shortly by a TCASII RA commanding a maximum rate descent. We followed the RA command and descended at maximum rate until we received a 'clear of conflict' message on the TCASII. We requested and received clearance to descend to FL240. There were no passenger or flight crew injuries and we proceeded to our destination. I feel that the TCASII unit on board this aircraft has been refined into an excellent tool for the pilot.
Original NASA ASRS Text
Title: ACR MLG RECEIVES TCASII RA AND DSCNT COMMAND DUE TO CLBING TFC. CTLR HAD ALERTED FLC TO THE CLBING TFC. RPTR ANTICIPATED A TCASII TA DUE TO CONFUSED DISCUSSION BTWN CTLR AND CLBING ACFT. UNKNOWN IF FLC OF OTHER ACFT CLBED THROUGH ASSIGNED ALT TO CAUSE LTSS OR LTSS WAS CAUSED BY THE TCASII RA EVASIVE ACTION DSCNT BY RPTR.
Narrative: OUR FLT WAS IN LEVEL CRUISE FLT AT FL290. NEBOUND ON J- 222, APPROX 20 NM S OF THE CAM VORTAC. WE WERE ALERTED TO TFC APCHING FROM OUR R BY ATC. WE MONITORED THE TFC ON OUR TCASII UNIT BECAUSE WE WERE IMC AT THE TIME. WE NOTED THAT THE TFC WAS CLBING AT A MODERATE RATE IN OUR DIRECTION AND WE ANTICIPATED A POSSIBLE TA BECAUSE OF THE SOMEWHAT CONFUSED DISCUSSION BTWN BOS ATC AND THE OTHER ACFT. WE DID RECEIVE A TCASII TA ALERT FOLLOWED SHORTLY BY A TCASII RA COMMANDING A MAX RATE DSCNT. WE FOLLOWED THE RA COMMAND AND DSNDED AT MAX RATE UNTIL WE RECEIVED A 'CLR OF CONFLICT' MESSAGE ON THE TCASII. WE REQUESTED AND RECEIVED CLRNC TO DSND TO FL240. THERE WERE NO PAX OR FLC INJURIES AND WE PROCEEDED TO OUR DEST. I FEEL THAT THE TCASII UNIT ON BOARD THIS ACFT HAS BEEN REFINED INTO AN EXCELLENT TOOL FOR THE PLT.
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.