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Air carrier X TCASII RA climb from ghost target had less than standard separation from air carrier Y. Pilot deviation non adherence to ATC clearance unauthorized climb from assigned altitude.
| Attributes | |
| ACN | 230378 |
| Time | |
| Date | 199301 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : sfo |
| State Reference | CA |
| Altitude | msl bound lower : 11000 msl bound upper : 12000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : oak tower : ord |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | cruise 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 |
| Navigation In Use | Other Other |
| Flight Phase | cruise other |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Qualification | controller : radar |
| Experience | controller radar : 5 |
| ASRS Report | 230377 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation non adherence : clearance |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other controllera |
| Resolutory Action | controller : issued new clearance flight crew : took evasive action other |
| Consequence | Other |
| Miss Distance | horizontal : 12000 vertical : 300 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
2 aircraft sebound, position 5 mi northwest sfo. Air carrier X level at 11000. Air carrier Y level 12000 2 mi in trail. Air carrier X was observed climbing out of 11300 ft. Upon questioning by ATC, air carrier X reported that they were responding to a TCASII RA. Air carrier X was advised of the traffic above him at 12000 and instructed to descend back to 11000. Air carrier X then did as instructed. There was no traffic at any altitude below the aircraft responding. Air carrier Y above at 12000 was advised of the situation and advised that he had aircraft in sight. This situation is of particular concern due to the lack of any traffic that could have been perceived as a potential threat.
Original NASA ASRS Text
Title: ACR X TCASII RA CLB FROM GHOST TARGET HAD LTSS FROM ACR Y. PLTDEV NON ADHERENCE TO ATC CLRNC UNAUTH CLB FROM ASSIGNED ALT.
Narrative: 2 ACFT SEBOUND, POS 5 MI NW SFO. ACR X LEVEL AT 11000. ACR Y LEVEL 12000 2 MI IN TRAIL. ACR X WAS OBSERVED CLBING OUT OF 11300 FT. UPON QUESTIONING BY ATC, ACR X RPTED THAT THEY WERE RESPONDING TO A TCASII RA. ACR X WAS ADVISED OF THE TFC ABOVE HIM AT 12000 AND INSTRUCTED TO DSND BACK TO 11000. ACR X THEN DID AS INSTRUCTED. THERE WAS NO TFC AT ANY ALT BELOW THE ACFT RESPONDING. ACR Y ABOVE AT 12000 WAS ADVISED OF THE SIT AND ADVISED THAT HE HAD ACFT IN SIGHT. THIS SIT IS OF PARTICULAR CONCERN DUE TO THE LACK OF ANY TFC THAT COULD HAVE BEEN PERCEIVED AS A POTENTIAL THREAT.
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.