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Air carrier flight crew in descent with ZLA take evasive action and climb due to aircraft 1000 ft below.
| Attributes | |
| ACN | 507035 |
| Time | |
| Date | 200103 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | navaid : bty.vortac |
| State Reference | NV |
| Altitude | msl bound lower : 28500 msl bound upper : 29000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zla.artcc tower : sfo.tower |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 2 Turbojet Eng |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | cruise : enroute altitude change |
| Route In Use | enroute airway : j92.airway |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zla.artcc |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | cruise : level |
| Route In Use | enroute airway : j92.airway |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : private pilot : multi engine pilot : instrument pilot : commercial |
| Experience | flight time last 90 days : 200 flight time total : 5000 flight time type : 2000 |
| ASRS Report | 507035 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : instrument pilot : multi engine pilot : atp pilot : commercial pilot : flight engineer |
| Experience | flight time last 90 days : 225 flight time total : 11800 flight time type : 6000 |
| ASRS Report | 506038 |
| Events | |
| Anomaly | altitude deviation : undershoot non adherence : required legal separation non adherence : published procedure |
| Independent Detector | other flight crewa other flight crewb |
| Resolutory Action | controller : issued new clearance flight crew : took evasive action |
| Miss Distance | horizontal : 500 vertical : 500 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Approximately 20 NM northwest of bty VOR on J-92, ZLA instructed us to descend from FL290 to FL250. At approximately FL285 we received a TCASII RA to reduce descent, then to climb. Red TCASII target showed converging from 12 O'clock position, 500 ft below us. We responded to the RA and climbed back to FL290. ATC simultaneously issued a turn to the left, but the approaching aircraft, opposite direction at FL280, was acquired visually and we initiated a slight right turn as the aircraft passed approximately 500 ft to the left and 500 ft below us.
Original NASA ASRS Text
Title: ACR FLC IN DSCNT WITH ZLA TAKE EVASIVE ACTION AND CLB DUE TO ACFT 1000 FT BELOW.
Narrative: APPROX 20 NM NW OF BTY VOR ON J-92, ZLA INSTRUCTED US TO DSND FROM FL290 TO FL250. AT APPROX FL285 WE RECEIVED A TCASII RA TO REDUCE DSCNT, THEN TO CLB. RED TCASII TARGET SHOWED CONVERGING FROM 12 O'CLOCK POS, 500 FT BELOW US. WE RESPONDED TO THE RA AND CLBED BACK TO FL290. ATC SIMULTANEOUSLY ISSUED A TURN TO THE L, BUT THE APCHING ACFT, OPPOSITE DIRECTION AT FL280, WAS ACQUIRED VISUALLY AND WE INITIATED A SLIGHT R TURN AS THE ACFT PASSED APPROX 500 FT TO THE L AND 500 FT BELOW US.
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.