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Air carrier X TCASII TA RA had less than standard separation from air carrier Y assigned same altitude. Evasive action descent. System error.
| Attributes | |
| ACN | 291764 |
| Time | |
| Date | 199412 |
| Day | Wed |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : aba |
| State Reference | FO |
| Altitude | msl bound lower : 33000 msl bound upper : 33000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : tncf tower : msp |
| Operator | common carrier : air carrier |
| Make Model Name | B727 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise other |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | DC-10 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other |
| 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 |
| ASRS Report | 291764 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| ASRS Report | 291763 |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude non adherence : clearance non adherence : published procedure non adherence : required legal separation |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified |
| Resolutory Action | flight crew : took evasive action |
| Consequence | Other |
| Miss Distance | horizontal : 3000 vertical : 500 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
In cruise at FL330 approaching aruba we noticed on TCASII a target at 1 O'clock, constant bearing, closing range. We received a TA and then an RA to descend. As I commenced the descent the TCASII showed the traffic beginning to climb. We obtained visual contact with the dc-10 when it was at 12 O'clock and 1/2 mi or less. We advised curacao control of our action and were told to maintain FL330. We told curacao about the traffic again and they called the other aircraft to confirm they were climbing to FL370. We were unable to understand the call sign and repeated requests to obtain the assigned flight level or aircraft identify from curacao were met with instructions for us to climb to FL370 which we repeatedly advised we were unable to do. Once that was understood, our requests were met with silence. The target aircraft had been level at FL330 until we received our RA.
Original NASA ASRS Text
Title: ACR X TCASII TA RA HAD LTSS FROM ACR Y ASSIGNED SAME ALT. EVASIVE ACTION DSCNT. SYS ERROR.
Narrative: IN CRUISE AT FL330 APCHING ARUBA WE NOTICED ON TCASII A TARGET AT 1 O'CLOCK, CONSTANT BEARING, CLOSING RANGE. WE RECEIVED A TA AND THEN AN RA TO DSND. AS I COMMENCED THE DSCNT THE TCASII SHOWED THE TFC BEGINNING TO CLB. WE OBTAINED VISUAL CONTACT WITH THE DC-10 WHEN IT WAS AT 12 O'CLOCK AND 1/2 MI OR LESS. WE ADVISED CURACAO CTL OF OUR ACTION AND WERE TOLD TO MAINTAIN FL330. WE TOLD CURACAO ABOUT THE TFC AGAIN AND THEY CALLED THE OTHER ACFT TO CONFIRM THEY WERE CLBING TO FL370. WE WERE UNABLE TO UNDERSTAND THE CALL SIGN AND REPEATED REQUESTS TO OBTAIN THE ASSIGNED FLT LEVEL OR ACFT IDENT FROM CURACAO WERE MET WITH INSTRUCTIONS FOR US TO CLB TO FL370 WHICH WE REPEATEDLY ADVISED WE WERE UNABLE TO DO. ONCE THAT WAS UNDERSTOOD, OUR REQUESTS WERE MET WITH SILENCE. THE TARGET ACFT HAD BEEN LEVEL AT FL330 UNTIL WE RECEIVED OUR RA.
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.