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Air carrier X TCASII RA descent through occupied altitude had less than standard separation from Y. System error. Evasive action taken.
| Attributes | |
| ACN | 246956 |
| Time | |
| Date | 199307 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : pie |
| State Reference | FL |
| Altitude | msl bound lower : 39000 msl bound upper : 39000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zjx |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | descent 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 | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 6500 flight time type : 500 |
| ASRS Report | 246956 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation non adherence : published procedure |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified |
| Resolutory Action | flight crew : took evasive action |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 18000 vertical : 1000 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Air carrier X was at 41000 ft. We were cleared to 35000 ft with an approximately 80 degree left turn for descent vectors. We were out of 39000 when we received an RA 'monitor vertical speed.' I increased vertical speed since I saw that the traffic Y was at 39000 ft on TCASII. We had the traffic Y. The situation was well under control a great deal because of TCASII since we had no traffic pointed out from the controller. The controller should have advised us in regards to traffic and also asked us for best rate of descent for traffic conflict or even better, kept us at 41000 until cleared of conflict. We made an inquiry to the controller in regards to the situation but was told that he just sat down and had no information.
Original NASA ASRS Text
Title: ACR X TCASII RA DSCNT THROUGH OCCUPIED ALT HAD LTSS FROM Y. SYS ERROR. EVASIVE ACTION TAKEN.
Narrative: ACR X WAS AT 41000 FT. WE WERE CLRED TO 35000 FT WITH AN APPROX 80 DEG L TURN FOR DSCNT VECTORS. WE WERE OUT OF 39000 WHEN WE RECEIVED AN RA 'MONITOR VERT SPD.' I INCREASED VERT SPD SINCE I SAW THAT THE TFC Y WAS AT 39000 FT ON TCASII. WE HAD THE TFC Y. THE SIT WAS WELL UNDER CTL A GREAT DEAL BECAUSE OF TCASII SINCE WE HAD NO TFC POINTED OUT FROM THE CTLR. THE CTLR SHOULD HAVE ADVISED US IN REGARDS TO TFC AND ALSO ASKED US FOR BEST RATE OF DSCNT FOR TFC CONFLICT OR EVEN BETTER, KEPT US AT 41000 UNTIL CLRED OF CONFLICT. WE MADE AN INQUIRY TO THE CTLR IN REGARDS TO THE SIT BUT WAS TOLD THAT HE JUST SAT DOWN AND HAD NO INFO.
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.