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Potential conflict ensues as opposite direction descending traffic maintains too slow a descent rate in proximity of thunderstorm activity. System error.
| Attributes | |
| ACN | 249469 |
| Time | |
| Date | 199308 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : vxv |
| State Reference | TN |
| Altitude | msl bound lower : 26000 msl bound upper : 26000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : ztl tracon : suu |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | cruise other cruise other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | general aviation : corporate |
| Make Model Name | Light Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | cruise other descent other |
| 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 : 8800 flight time type : 500 |
| ASRS Report | 249469 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : undershoot conflict : airborne less severe non adherence : required legal separation non adherence : clearance other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other controllera |
| Resolutory Action | controller : issued new clearance flight crew : took evasive action other |
| Consequence | faa : reviewed incident with flight crew |
| Miss Distance | horizontal : 6000 vertical : 500 |
| Supplementary | |
| Primary Problem | Weather |
| Air Traffic Incident | Pilot Deviation Operational Error |
| Situations | |
| ATC Facility | procedure or policy : unspecified |
Narrative:
Flying rdu-ord deviating through gap in thunderstorm line. Going through hole at FL260, observed on TCASII another aircraft head-on, 10 mi, descending slowly and not at a uniform rate. ZTL called us and told us 'turn 15 degree...?? (Static from thunderstorm) immediately for traffic.' we turned 15 degrees right based on TCASII information as we sought to clarify the direction of turn. Controller talked to offending aircraft for not descending fast enough and other traffic caused such congestion that everyone was stepping all over everyone until fully 3-4 mins later. By that time, traffic conflict was over and we were reclred direct vhp without any questioning by controller as to our direction of turn or mention of the potential conflict.
Original NASA ASRS Text
Title: POTENTIAL CONFLICT ENSUES AS OPPOSITE DIRECTION DSNDING TFC MAINTAINS TOO SLOW A DSCNT RATE IN PROX OF TSTM ACTIVITY. SYS ERROR.
Narrative: FLYING RDU-ORD DEVIATING THROUGH GAP IN TSTM LINE. GOING THROUGH HOLE AT FL260, OBSERVED ON TCASII ANOTHER ACFT HEAD-ON, 10 MI, DSNDING SLOWLY AND NOT AT A UNIFORM RATE. ZTL CALLED US AND TOLD US 'TURN 15 DEG...?? (STATIC FROM TSTM) IMMEDIATELY FOR TFC.' WE TURNED 15 DEGS R BASED ON TCASII INFO AS WE SOUGHT TO CLARIFY THE DIRECTION OF TURN. CTLR TALKED TO OFFENDING ACFT FOR NOT DSNDING FAST ENOUGH AND OTHER TFC CAUSED SUCH CONGESTION THAT EVERYONE WAS STEPPING ALL OVER EVERYONE UNTIL FULLY 3-4 MINS LATER. BY THAT TIME, TFC CONFLICT WAS OVER AND WE WERE RECLRED DIRECT VHP WITHOUT ANY QUESTIONING BY CTLR AS TO OUR DIRECTION OF TURN OR MENTION OF THE POTENTIAL CONFLICT.
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.