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Air carrier X non adherence to ATC clearance TCASII RA from VFR aircraft descent from assigned altitude had TCASII RA with air carrier Y. Possible less than standard separation. Pilot deviation.
| Attributes | |
| ACN | 214655 |
| Time | |
| Date | 199207 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : dfw |
| State Reference | TX |
| Altitude | msl bound lower : 10300 msl bound upper : 11000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : dfw tower : ack |
| Operator | common carrier : air carrier |
| Make Model Name | Widebody, Low Wing, 3 Turbojet Eng |
| Flight Phase | climbout : intermediate altitude cruise other descent other |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| 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 military : 4 controller non radar : 2 controller radar : 9 |
| ASRS Report | 214655 |
| 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 : required legal separation non adherence : clearance |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other controllera |
| Resolutory Action | flight crew : took evasive action other |
| Consequence | Other |
| Miss Distance | horizontal : 12000 vertical : 1000 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Air carrier X was nebound level at 11000. Traffic was issued on a VFR aircraft wbound at 11000 (above the TCA). Air carrier X advised he was complying with a TCASII alert and had descended. His altitude at the lowest point showed 10300 ft. I issued air carrier Y at his 4 O'clock 3 mi wbound out of 8700 climbing to 10000. Air carrier X then said he had a TCASII alert and was climbing. Air carrier Y was about 9300 ft and 2 mi with diverging courses. Traffic was heavy at the time and I did not see how high air carrier X climbed if he did at all due to overlapping data tags.
Original NASA ASRS Text
Title: ACR X NON ADHERENCE TO ATC CLRNC TCASII RA FROM VFR ACFT DSCNT FROM ASSIGNED ALT HAD TCASII RA WITH ACR Y. POSSIBLE LTSS. PLTDEV.
Narrative: ACR X WAS NEBOUND LEVEL AT 11000. TFC WAS ISSUED ON A VFR ACFT WBOUND AT 11000 (ABOVE THE TCA). ACR X ADVISED HE WAS COMPLYING WITH A TCASII ALERT AND HAD DSNDED. HIS ALT AT THE LOWEST POINT SHOWED 10300 FT. I ISSUED ACR Y AT HIS 4 O'CLOCK 3 MI WBOUND OUT OF 8700 CLBING TO 10000. ACR X THEN SAID HE HAD A TCASII ALERT AND WAS CLBING. ACR Y WAS ABOUT 9300 FT AND 2 MI WITH DIVERGING COURSES. TFC WAS HVY AT THE TIME AND I DID NOT SEE HOW HIGH ACR X CLBED IF HE DID AT ALL DUE TO OVERLAPPING DATA TAGS.
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.