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A descending a 320 receives a TCASII RA while out of 13000 ft for 12000 ft. Frequency change to sct approach controller incomplete due to traffic volume. Unrpted traffic concerned reporter. Mzb, ca.
| Attributes | |
| ACN | 450064 |
| Time | |
| Date | 199909 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | navaid : mzb.vortac |
| State Reference | CA |
| Altitude | msl bound lower : 12000 msl bound upper : 13000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | artcc : zla.artcc tracon : sct.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | A320 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other other vortac |
| Flight Phase | descent : approach descent : vacating altitude |
| Route In Use | arrival : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | tracon : sct.tracon |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : multi engine pilot : atp pilot : commercial pilot : instrument |
| Experience | flight time last 90 days : 200 flight time total : 12000 flight time type : 2000 |
| ASRS Report | 450064 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial pilot : multi engine |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation non adherence : published procedure |
| Independent Detector | aircraft equipment : tcas |
| Resolutory Action | flight crew : took evasive action |
| Consequence | faa : reviewed incident with flight crew |
| Miss Distance | vertical : 1000 |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance ATC Human Performance Airspace Structure |
| Primary Problem | ATC Human Performance |
Narrative:
With ZLA, a clearance to 12000 ft was given for 15 NM east of baret intersection. A vector was then given to head 190 degrees and contact socal approach. Some difficulty in contacting approach, descent was passing 13000 ft for 12000 ft. Traffic was noted on TCASII with a resulting RA. After reaction to RA was completed, contact with ZLA was established. Reported RA action. Center responded that socal approach would have had lower so it shouldn't have been a problem. Murphy's law applies here -- if it is the most inopportune time it will! Considering time element it is doubtful socal could have given a lower altitude to avoid the RA. A frequency change with a potential traffic conflict should be delayed until traffic conflict is resolved.
Original NASA ASRS Text
Title: A DSNDING A 320 RECEIVES A TCASII RA WHILE OUT OF 13000 FT FOR 12000 FT. FREQ CHANGE TO SCT APCH CTLR INCOMPLETE DUE TO TFC VOLUME. UNRPTED TFC CONCERNED RPTR. MZB, CA.
Narrative: WITH ZLA, A CLRNC TO 12000 FT WAS GIVEN FOR 15 NM E OF BARET INTXN. A VECTOR WAS THEN GIVEN TO HEAD 190 DEGS AND CONTACT SOCAL APCH. SOME DIFFICULTY IN CONTACTING APCH, DSCNT WAS PASSING 13000 FT FOR 12000 FT. TFC WAS NOTED ON TCASII WITH A RESULTING RA. AFTER REACTION TO RA WAS COMPLETED, CONTACT WITH ZLA WAS ESTABLISHED. RPTED RA ACTION. CTR RESPONDED THAT SOCAL APCH WOULD HAVE HAD LOWER SO IT SHOULDN'T HAVE BEEN A PROB. MURPHY'S LAW APPLIES HERE -- IF IT IS THE MOST INOPPORTUNE TIME IT WILL! CONSIDERING TIME ELEMENT IT IS DOUBTFUL SOCAL COULD HAVE GIVEN A LOWER ALT TO AVOID THE RA. A FREQ CHANGE WITH A POTENTIAL TFC CONFLICT SHOULD BE DELAYED UNTIL TFC CONFLICT IS RESOLVED.
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.