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Near midair collision between A320 descending through 16500 ft MSL and another aircraft of which was instructed by ARTCC controller to maintain visual separation with the A320. TCASII RA instructed A320 to climb full power to avoid target.
| Attributes | |
| ACN | 546124 |
| Time | |
| Date | 200204 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | intersection : skunk |
| State Reference | CA |
| Altitude | msl single value : 16500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : o90.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | A320 |
| Operating Under FAR Part | Part 121 |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | tracon : o90.tracon |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | cruise : level |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : cfi pilot : multi engine pilot : instrument pilot : commercial pilot : atp |
| Experience | flight time last 90 days : 115 flight time total : 6300 flight time type : 800 |
| ASRS Report | 546124 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | conflict : nmac non adherence : far non adherence : published procedure other anomaly other |
| Independent Detector | aircraft equipment : tcas other flight crewa |
| Resolutory Action | controller : issued advisory flight crew : took evasive action |
| Miss Distance | horizontal : 0 vertical : 300 |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
Narrative:
Descending via the big sur arrival into sfo, bay approach called traffic at 10 O'clock position. We did not have a visual on the traffic, but other aircraft called us in sight. Bay approach told that aircraft to maintain visual with us. We were cleared to descend to 10000 ft MSL. Shortly thereafter, we got a TCASII advisory to arrest descent, we followed. Then came an RA warning to climb -- full power, autoplt disconnected, aft stick to satisfy the RA command (3500 FPM). Aircraft on TCASII display was at 1 - 1:30 O'clock position, 2 NM, approximately 300 ft below us. Notified bay approach of the incident. Other aircraft failed to maintain visual separation.
Original NASA ASRS Text
Title: NMAC BTWN A320 DSNDING THROUGH 16500 FT MSL AND ANOTHER ACFT OF WHICH WAS INSTRUCTED BY ARTCC CTLR TO MAINTAIN VISUAL SEPARATION WITH THE A320. TCASII RA INSTRUCTED A320 TO CLB FULL PWR TO AVOID TARGET.
Narrative: DSNDING VIA THE BIG SUR ARR INTO SFO, BAY APCH CALLED TFC AT 10 O'CLOCK POS. WE DID NOT HAVE A VISUAL ON THE TFC, BUT OTHER ACFT CALLED US IN SIGHT. BAY APCH TOLD THAT ACFT TO MAINTAIN VISUAL WITH US. WE WERE CLRED TO DSND TO 10000 FT MSL. SHORTLY THEREAFTER, WE GOT A TCASII ADVISORY TO ARREST DSCNT, WE FOLLOWED. THEN CAME AN RA WARNING TO CLB -- FULL PWR, AUTOPLT DISCONNECTED, AFT STICK TO SATISFY THE RA COMMAND (3500 FPM). ACFT ON TCASII DISPLAY WAS AT 1 - 1:30 O'CLOCK POS, 2 NM, APPROX 300 FT BELOW US. NOTIFIED BAY APCH OF THE INCIDENT. OTHER ACFT FAILED TO MAINTAIN VISUAL SEPARATION.
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.