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Nct controller experienced loss of separation at approximately 9500 ft in sfo class B between IFR heavy air carrier arrival and VFR overflt.
| Attributes | |
| ACN | 669268 |
| Time | |
| Date | 200508 |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : sfo.airport |
| State Reference | CA |
| Altitude | msl single value : 9500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : nct.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | B777 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Route In Use | arrival : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | tracon : nct.tracon |
| Operator | general aviation : personal |
| Make Model Name | Bonanza 35 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise : level |
| Flight Plan | VFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| Experience | controller radar : 25 |
| ASRS Report | 669268 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | conflict : airborne critical conflict : nmac non adherence : required legal separation |
| Independent Detector | atc equipment : conflict alert aircraft equipment : tcas other controllera |
| Resolutory Action | controller : issued alert controller : issued new clearance controller : issued advisory |
| Miss Distance | horizontal : 100 vertical : 300 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
B777 on delay radar vectors heading 150 degrees; 10000 ft; descending to 9000 ft. BE35; VFR; 9500 ft; sebound. Issued traffic to B777 at 12 O'clock position; 2-3 mi; when B777 was 9600 ft; descending. B777 responded to TCASII and stopped descending and climbed to 10000 ft passing directly overhead the BE35; 500 ft above. Heavy jet traffic is required to be 1000 ft above a BE35 in class B airspace. Should have issued traffic to B777 sooner and BE35 should have taken action to provide extra separation to avoid B777 having to respond to TCASII.
Original NASA ASRS Text
Title: NCT CTLR EXPERIENCED LOSS OF SEPARATION AT APPROX 9500 FT IN SFO CLASS B BTWN IFR HVY ACR ARR AND VFR OVERFLT.
Narrative: B777 ON DELAY RADAR VECTORS HDG 150 DEGS; 10000 FT; DSNDING TO 9000 FT. BE35; VFR; 9500 FT; SEBOUND. ISSUED TFC TO B777 AT 12 O'CLOCK POS; 2-3 MI; WHEN B777 WAS 9600 FT; DSNDING. B777 RESPONDED TO TCASII AND STOPPED DSNDING AND CLBED TO 10000 FT PASSING DIRECTLY OVERHEAD THE BE35; 500 FT ABOVE. HVY JET TFC IS REQUIRED TO BE 1000 FT ABOVE A BE35 IN CLASS B AIRSPACE. SHOULD HAVE ISSUED TFC TO B777 SOONER AND BE35 SHOULD HAVE TAKEN ACTION TO PROVIDE EXTRA SEPARATION TO AVOID B777 HAVING TO RESPOND TO TCASII.
Data retrieved from NASA's ASRS site as of January 2009 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.