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A possible system error results in an near midair collision when approach control clears another air carrier aircraft to cross over and behind a B737 on approach to runway 25L at lax, ca.
| Attributes | |
| ACN | 552983 |
| Time | |
| Date | 200207 |
| Day | Mon |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | intersection : limma |
| State Reference | CA |
| Altitude | msl single value : 2100 |
| Aircraft 1 | |
| Controlling Facilities | tower : lax.tower |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Route In Use | approach : visual |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 552983 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | conflict : nmac non adherence : required legal separation other anomaly other |
| Independent Detector | aircraft equipment : tcas other flight crewa other flight crewb |
| Resolutory Action | flight crew : took evasive action flight crew : returned to original clearance other |
| Consequence | faa : reviewed incident with flight crew other |
| Miss Distance | unspecified : 500 |
| Supplementary | |
| Problem Areas | Airspace Structure Flight Crew Human Performance ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Location: intersection left, runway 25L approach. We were cleared for the visual approach to runway 25L. Approaching intersection left on GS, we received a 'descend' RA and complied with it. Switching from socal to tower, I reported intersection left and that we were following an RA. Tower reported traffic on a visual to runway 25R which had pulled up wingtip to wingtip. I believe approach had cleared this aircraft to pass above and behind us, the first officer first visually acquired the aircraft above/behind and to the right, and felt it was within 500 ft. No near midair collision was filed with the tower due to timeliness and frequency congestion. After landing, I called the lax tower supervisor and socal supervisor to discuss the event and basically failed to receive a satisfactory explanation.
Original NASA ASRS Text
Title: A POSSIBLE SYS ERROR RESULTS IN AN NMAC WHEN APCH CTL CLRS ANOTHER ACR ACFT TO CROSS OVER AND BEHIND A B737 ON APCH TO RWY 25L AT LAX, CA.
Narrative: LOCATION: INTXN L, RWY 25L APCH. WE WERE CLRED FOR THE VISUAL APCH TO RWY 25L. APCHING INTXN L ON GS, WE RECEIVED A 'DSND' RA AND COMPLIED WITH IT. SWITCHING FROM SOCAL TO TWR, I RPTED INTXN L AND THAT WE WERE FOLLOWING AN RA. TWR RPTED TFC ON A VISUAL TO RWY 25R WHICH HAD PULLED UP WINGTIP TO WINGTIP. I BELIEVE APCH HAD CLRED THIS ACFT TO PASS ABOVE AND BEHIND US, THE FO FIRST VISUALLY ACQUIRED THE ACFT ABOVE/BEHIND AND TO THE R, AND FELT IT WAS WITHIN 500 FT. NO NMAC WAS FILED WITH THE TWR DUE TO TIMELINESS AND FREQ CONGESTION. AFTER LNDG, I CALLED THE LAX TWR SUPVR AND SOCAL SUPVR TO DISCUSS THE EVENT AND BASICALLY FAILED TO RECEIVE A SATISFACTORY EXPLANATION.
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.