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Medium large transport given descent clearance by approach controller and then had clearance rescinded due to VFR traffic. Medium large transport felt incident was near midair collision.
| Attributes | |
| ACN | 89605 |
| Time | |
| Date | 198806 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : sfo |
| State Reference | CA |
| Altitude | msl bound lower : 10500 msl bound upper : 10800 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | cruise other descent other |
| Route In Use | enroute airway : oak |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | general aviation : corporate |
| Make Model Name | Small Transport, Low Wing, 2 Turboprop Eng |
| Flight Phase | cruise other |
| Flight Plan | VFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : flight engineer |
| Experience | flight time last 90 days : 180 flight time total : 14000 flight time type : 180 |
| ASRS Report | 89605 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | Other |
| Miss Distance | horizontal : 12000 vertical : 300 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | other |
Narrative:
On approach control, 134.5, at 11000' on the 095 degree right/30 DME sfo VOR the crew experienced a near miss with an small transport Y. Small transport Y took evasive action by making a right turn behind us. We were on a 240 degree heading at 11000'. Approach control cleared us to descend to 8000'. Immediately after starting a descent approach told us to level off at 11000'. By then we had descended to 10800'. Approach notified us of the traffic off to our left northbound at 10500'. The small transport Y passed behind us. Estimate proximity as 300' vertical and 2 mi horizontal. A near miss report was filed with the agency involved.
Original NASA ASRS Text
Title: MLG GIVEN DESCENT CLRNC BY APCH CTLR AND THEN HAD CLRNC RESCINDED DUE TO VFR TRAFFIC. MLG FELT INCIDENT WAS NMAC.
Narrative: ON APCH CTL, 134.5, AT 11000' ON THE 095 DEG R/30 DME SFO VOR THE CREW EXPERIENCED A NEAR MISS WITH AN SMT Y. SMT Y TOOK EVASIVE ACTION BY MAKING A RIGHT TURN BEHIND US. WE WERE ON A 240 DEG HDG AT 11000'. APCH CTL CLRED US TO DSND TO 8000'. IMMEDIATELY AFTER STARTING A DSCNT APCH TOLD US TO LEVEL OFF AT 11000'. BY THEN WE HAD DSNDED TO 10800'. APCH NOTIFIED US OF THE TFC OFF TO OUR LEFT NBOUND AT 10500'. THE SMT Y PASSED BEHIND US. ESTIMATE PROX AS 300' VERT AND 2 MI HORIZ. A NEAR MISS RPT WAS FILED WITH THE AGENCY INVOLVED.
Data retrieved from NASA's ASRS site as of August 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.