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C182 VFR transitioning the sfo area caused TCASII for B747 below him with no apparent traffic information from ATC.
| Attributes | |
| ACN | 604808 |
| Time | |
| Date | 200401 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | navaid : osi.vortac |
| State Reference | CA |
| Altitude | msl bound lower : 11500 msl bound upper : 12000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : nct.tracon |
| Operator | general aviation : instructional |
| Make Model Name | Skylane 182/RG Turbo Skylane/RG |
| Operating Under FAR Part | Part 91 |
| Navigation In Use | other |
| Flight Phase | cruise : level |
| Flight Plan | VFR |
| Aircraft 2 | |
| Controlling Facilities | tracon : nct.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | B747 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : intermediate altitude descent : approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | other |
| Function | flight crew : single pilot |
| Qualification | pilot : instrument pilot : private |
| Experience | flight time last 90 days : 30 flight time total : 1650 flight time type : 300 |
| ASRS Report | 604808 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | conflict : airborne critical non adherence : published procedure |
| Independent Detector | aircraft equipment : tcas other flight crewa |
| Resolutory Action | none taken : anomaly accepted |
| Miss Distance | horizontal : 1000 vertical : 1000 |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance ATC Human Performance |
| Primary Problem | Ambiguous |
Narrative:
Sse of haf at approximately 12000 ft in communication with ATC (on flight following), VFR -- maybe 9-10 NM from woodside VOR on about 295 degree radial. Was in cruise and at this same altitude and heading for at least 1 hour. Communication frequency 133.95, previous frequency 125.45 (oakland). B747 was observed banking to our left -- we were northbound. B747 was lower than we were when observed in the banking turn. B747 also contacted approach (on our same frequency 133.95) to report a TCASII alert and an near midair collision with a cessna (us). B747 requested 'forms' to report incident.
Original NASA ASRS Text
Title: C182 VFR TRANSITIONING THE SFO AREA CAUSED TCASII FOR B747 BELOW HIM WITH NO APPARENT TFC INFO FROM ATC.
Narrative: SSE OF HAF AT APPROX 12000 FT IN COM WITH ATC (ON FLT FOLLOWING), VFR -- MAYBE 9-10 NM FROM WOODSIDE VOR ON ABOUT 295 DEG RADIAL. WAS IN CRUISE AND AT THIS SAME ALT AND HDG FOR AT LEAST 1 HR. COM FREQ 133.95, PREVIOUS FREQ 125.45 (OAKLAND). B747 WAS OBSERVED BANKING TO OUR L -- WE WERE NBOUND. B747 WAS LOWER THAN WE WERE WHEN OBSERVED IN THE BANKING TURN. B747 ALSO CONTACTED APCH (ON OUR SAME FREQ 133.95) TO RPT A TCASII ALERT AND AN NMAC WITH A CESSNA (US). B747 REQUESTED 'FORMS' TO RPT INCIDENT.
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.