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Air carrier X TCASII RA non adherence to ATC clearance took evasive action from air carrier Y maintaining visual separation. Pilot deviation.
| Attributes | |
| ACN | 244912 |
| Time | |
| Date | 199306 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : gso |
| State Reference | NC |
| Altitude | msl bound lower : 10000 msl bound upper : 10000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | Light Transport, Low Wing, 2 Turboprop Eng |
| Flight Phase | cruise other |
| Route In Use | enroute : direct enroute airway : gso |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| Experience | controller radar : 28 |
| ASRS Report | 244912 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : clearance |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified |
| Resolutory Action | flight crew : took evasive action |
| Consequence | Other |
| Miss Distance | horizontal : 3000 vertical : 200 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Air carrier X swbound at 10000 and air carrier Y climbing to 11000 swbound. Air carrier Y had air carrier X in sight and maintaining visual separation. Air carrier X was told twice about air carrier Y maintaining visual separation and twice was given air carrier Y's position and altitude. Air carrier X advises he is doing a TCASII resolution and is descending to 9000 ft. Air carrier X advises he had a resolution of 200 ft from air carrier Y. I was getting an altitude readout on air carrier Y of 10700 ft. My perception is that air carrier Y had air carrier X in sight and did apply visual separation. Air carrier X descended without a clearance to 9000 ft. This could have put air carrier X head-on with opposite direction traffic at 9000 ft. If air carrier X would have climbed to 11000 ft he could have run into air carrier Y who was climbing to 11000 ft.
Original NASA ASRS Text
Title: ACR X TCASII RA NON ADHERENCE TO ATC CLRNC TOOK EVASIVE ACTION FROM ACR Y MAINTAINING VISUAL SEPARATION. PLTDEV.
Narrative: ACR X SWBOUND AT 10000 AND ACR Y CLBING TO 11000 SWBOUND. ACR Y HAD ACR X IN SIGHT AND MAINTAINING VISUAL SEPARATION. ACR X WAS TOLD TWICE ABOUT ACR Y MAINTAINING VISUAL SEPARATION AND TWICE WAS GIVEN ACR Y'S POSITION AND ALT. ACR X ADVISES HE IS DOING A TCASII RESOLUTION AND IS DSNDING TO 9000 FT. ACR X ADVISES HE HAD A RESOLUTION OF 200 FT FROM ACR Y. I WAS GETTING AN ALT READOUT ON ACR Y OF 10700 FT. MY PERCEPTION IS THAT ACR Y HAD ACR X IN SIGHT AND DID APPLY VISUAL SEPARATION. ACR X DSNDED WITHOUT A CLRNC TO 9000 FT. THIS COULD HAVE PUT ACR X HEAD-ON WITH OPPOSITE DIRECTION TFC AT 9000 FT. IF ACR X WOULD HAVE CLBED TO 11000 FT HE COULD HAVE RUN INTO ACR Y WHO WAS CLBING TO 11000 FT.
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.