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G2 with ZLA was issued descent to FL330 and experienced TCAS RA; FAA recorded pilot deviation because of apparent loss of separation.
| Attributes | |
| ACN | 731526 |
| Time | |
| Date | 200703 |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : psp.airport |
| State Reference | CA |
| Altitude | msl bound lower : 32000 msl bound upper : 33000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zla.artcc |
| Operator | common carrier : charter |
| Make Model Name | Gulfstream II |
| Operating Under FAR Part | Part 91 |
| Flight Phase | descent : intermediate altitude |
| Route In Use | arrival : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zla.artcc |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | cruise : level |
| Person 1 | |
| Affiliation | company : charter |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 210 flight time total : 30000 flight time type : 4000 |
| ASRS Report | 731526 |
| Person 2 | |
| Affiliation | company : charter |
| Function | flight crew : first officer |
| Qualification | pilot : multi engine pilot : instrument pilot : atp |
| Experience | flight time last 90 days : 50 flight time total : 11300 flight time type : 4500 |
| ASRS Report | 731622 |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : airborne critical non adherence : clearance |
| Independent Detector | other flight crewa other flight crewb |
| Resolutory Action | flight crew : took evasive action |
| Miss Distance | vertical : 600 |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Operational Deviation |
Narrative:
ATC cleared aircraft X to descend to FL330. Further instruction was given to turn left 20 degrees to avoid traffic. Just prior to leveling off at FL330 we received a TCAS RA; 'adjust altitude to avoid conflict; adjust altitude to avoid conflict.' at that time I saw a solid red target on my TCAS indicator and the ivsi command a descend. I immediately took evasive action and followed the command of the ivsi; I continued to descend; at approximately FL326 I received a TCAS report; 'clear of conflict.' just about that time we received a call from ATC; 'aircraft X you were cleared to FL330.' ATC was busy with other traffic at that time so we could not give him the reason we had to descend below FL330. I told the first officer to roger him I will talk to him on the ground. We then received a frequency change to socal approach who gave us a telephone number to call los angeles when we get on the ground which I did; and I explained to the supervisor why I deviated the assigned altitude as explained above.
Original NASA ASRS Text
Title: G2 WITH ZLA WAS ISSUED DESCENT TO FL330 AND EXPERIENCED TCAS RA; FAA RECORDED PLTDEV BECAUSE OF APPARENT LOSS OF SEPARATION.
Narrative: ATC CLRED ACFT X TO DSND TO FL330. FURTHER INSTRUCTION WAS GIVEN TO TURN L 20 DEGS TO AVOID TFC. JUST PRIOR TO LEVELING OFF AT FL330 WE RECEIVED A TCAS RA; 'ADJUST ALT TO AVOID CONFLICT; ADJUST ALT TO AVOID CONFLICT.' AT THAT TIME I SAW A SOLID RED TARGET ON MY TCAS INDICATOR AND THE IVSI COMMAND A DSND. I IMMEDIATELY TOOK EVASIVE ACTION AND FOLLOWED THE COMMAND OF THE IVSI; I CONTINUED TO DSND; AT APPROX FL326 I RECEIVED A TCAS RPT; 'CLR OF CONFLICT.' JUST ABOUT THAT TIME WE RECEIVED A CALL FROM ATC; 'ACFT X YOU WERE CLRED TO FL330.' ATC WAS BUSY WITH OTHER TFC AT THAT TIME SO WE COULD NOT GIVE HIM THE REASON WE HAD TO DSND BELOW FL330. I TOLD THE FO TO ROGER HIM I WILL TALK TO HIM ON THE GND. WE THEN RECEIVED A FREQ CHANGE TO SOCAL APCH WHO GAVE US A TELEPHONE NUMBER TO CALL LOS ANGELES WHEN WE GET ON THE GND WHICH I DID; AND I EXPLAINED TO THE SUPVR WHY I DEVIATED THE ASSIGNED ALT AS EXPLAINED ABOVE.
Data retrieved from NASA's ASRS site as of January 2009 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.