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A B737 flight crew exceeds their desired angle of bank at 5000 ft in avoiding opposite direction same altitude traffic southeast of sna, ca.
| Attributes | |
| ACN | 513396 |
| Time | |
| Date | 200106 |
| Day | Sun |
| Place | |
| Locale Reference | airport : sna.airport |
| State Reference | CA |
| Altitude | msl single value : 5000 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : sct.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : intermediate altitude |
| Route In Use | approach : traffic pattern |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | tracon : sct.tracon |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Person 1 | |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 513396 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | conflict : airborne critical non adherence : company policies non adherence : required legal separation |
| Independent Detector | aircraft equipment : tcas other flight crewa |
| Resolutory Action | controller : issued new clearance controller : separated traffic flight crew : took evasive action other |
| Consequence | faa : reviewed incident with flight crew other |
| Miss Distance | horizontal : 9000 vertical : 0 |
| Supplementary | |
| Problem Areas | Airspace Structure ATC Human Performance Flight Crew Human Performance |
| Primary Problem | ATC Human Performance |
| Situations | |
| ATC Facility | procedure or policy : sct.tracon |
Narrative:
Location: radar downwind sna runway 19R. On radar downwind at 5000 ft and 190 KTS, I saw 2 TCASII targets approximately 5 mi on my nose -- 1 co-altitude, and the other 400-500 ft below my altitude. They were moving straight at my aircraft. I announced to the socal controller a traffic conflict existed on my nose, co-altitude. He gave me a right turn to 170 degrees. As I started the turn, TCASII announced 'traffic, traffic' on the co-altitude target. As I started the turn, I crosschecked the TCASII and knew that this was going to be close. I tightened up the turn by going to approximately 45 degrees of bank. The aircraft announced 'bank angle, bank angle' -- possibly blocking a TCASII RA. As best as I can determine, I was within approximately 1 1/2 mi of the co-altitude target during the turn. Oddly, the controller didn't believe the separation was much of a problem. A telephonic debrief with the socal supervisor on duty was made after landing.
Original NASA ASRS Text
Title: A B737 FLC EXCEEDS THEIR DESIRED ANGLE OF BANK AT 5000 FT IN AVOIDING OPPOSITE DIRECTION SAME ALT TFC SE OF SNA, CA.
Narrative: LOCATION: RADAR DOWNWIND SNA RWY 19R. ON RADAR DOWNWIND AT 5000 FT AND 190 KTS, I SAW 2 TCASII TARGETS APPROX 5 MI ON MY NOSE -- 1 CO-ALT, AND THE OTHER 400-500 FT BELOW MY ALT. THEY WERE MOVING STRAIGHT AT MY ACFT. I ANNOUNCED TO THE SOCAL CTLR A TFC CONFLICT EXISTED ON MY NOSE, CO-ALT. HE GAVE ME A R TURN TO 170 DEGS. AS I STARTED THE TURN, TCASII ANNOUNCED 'TFC, TFC' ON THE CO-ALT TARGET. AS I STARTED THE TURN, I XCHKED THE TCASII AND KNEW THAT THIS WAS GOING TO BE CLOSE. I TIGHTENED UP THE TURN BY GOING TO APPROX 45 DEGS OF BANK. THE ACFT ANNOUNCED 'BANK ANGLE, BANK ANGLE' -- POSSIBLY BLOCKING A TCASII RA. AS BEST AS I CAN DETERMINE, I WAS WITHIN APPROX 1 1/2 MI OF THE CO-ALT TARGET DURING THE TURN. ODDLY, THE CTLR DIDN'T BELIEVE THE SEPARATION WAS MUCH OF A PROB. A TELEPHONIC DEBRIEF WITH THE SOCAL SUPVR ON DUTY WAS MADE AFTER LNDG.
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.