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Light transport air carrier flight crew had near midair collision with small aircraft approximately 25 miles east of sfo.
| Attributes | |
| ACN | 135523 |
| Time | |
| Date | 199002 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : sfo |
| State Reference | CA |
| Altitude | msl bound lower : 6500 msl bound upper : 7000 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | Light Transport, Low Wing, 2 Turboprop Eng |
| Navigation In Use | Other Other |
| Flight Phase | descent : approach |
| Route In Use | enroute : on vectors enroute airway : oak |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | general aviation : personal |
| Make Model Name | Small Aircraft |
| Flight Phase | cruise other |
| Flight Plan | None |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : instrument pilot : commercial pilot : atp |
| Experience | flight time last 90 days : 100 flight time total : 4000 flight time type : 45 |
| ASRS Report | 135523 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | conflict : nmac inflight encounter : vfr in imc |
| Independent Detector | other controllera other flight crewa |
| Resolutory Action | flight crew : took evasive action other |
| Consequence | Other |
| Miss Distance | horizontal : 0 vertical : 450 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
Narrative:
Our aircraft was being vectored for visibility approach to sfo. We were level at 7000' and traffic, an small aircraft, was called out to us 'VFR at 6500', 1 1/2 mi, 11 O'clock.' our observation of the 11 O'clock position showed a large cumulus cloud that would have put traffic in the cloud. We heard our flight called as traffic and the small aircraft stated he was 'VFR T 6500'' and could maintain. 20-30 seconds later we were given 'traffic alert, pull up!' we immediately pulled up 500' and I observed this aircraft go below my eat from 11 O'clock, less than 500' below and less than a second later. My conclusion was that this aircraft either came out of the observed cloud or around it, within very few ft of the cloud. After this near collision our flight proceeded routinely to sfo.
Original NASA ASRS Text
Title: LTT ACR FLT CREW HAD NMAC WITH SMA APPROX 25 MILES EAST OF SFO.
Narrative: OUR ACFT WAS BEING VECTORED FOR VIS APCH TO SFO. WE WERE LEVEL AT 7000' AND TFC, AN SMA, WAS CALLED OUT TO US 'VFR AT 6500', 1 1/2 MI, 11 O'CLOCK.' OUR OBSERVATION OF THE 11 O'CLOCK POS SHOWED A LARGE CUMULUS CLOUD THAT WOULD HAVE PUT TFC IN THE CLOUD. WE HEARD OUR FLT CALLED AS TFC AND THE SMA STATED HE WAS 'VFR T 6500'' AND COULD MAINTAIN. 20-30 SECS LATER WE WERE GIVEN 'TFC ALERT, PULL UP!' WE IMMEDIATELY PULLED UP 500' AND I OBSERVED THIS ACFT GO BELOW MY EAT FROM 11 O'CLOCK, LESS THAN 500' BELOW AND LESS THAN A SECOND LATER. MY CONCLUSION WAS THAT THIS ACFT EITHER CAME OUT OF THE OBSERVED CLOUD OR AROUND IT, WITHIN VERY FEW FT OF THE CLOUD. AFTER THIS NEAR COLLISION OUR FLT PROCEEDED ROUTINELY TO SFO.
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.