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Small aircraft descended through clouds without clearance and had close proximity with small transport on ILS approach. Tower intervened and small transport took evasive action.
| Attributes | |
| ACN | 95510 |
| Time | |
| Date | 198810 |
| Day | Wed |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : oak |
| State Reference | CA |
| Altitude | msl bound lower : 400 msl bound upper : 900 |
| Environment | |
| Flight Conditions | IMC |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | tower : oak |
| Operator | general aviation : personal |
| Make Model Name | Small Transport, Low Wing, 2 Recip Eng |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Small Aircraft, High Wing, 1 Eng, Fixed Gear |
| Flight Phase | descent other |
| Person 1 | |
| Affiliation | Other |
| Function | flight crew : single pilot |
| Qualification | pilot : private pilot : instrument |
| Experience | flight time last 90 days : 40 flight time total : 2000 flight time type : 600 |
| ASRS Report | 95510 |
| Person 2 | |
| Affiliation | Other |
| Function | flight crew : single pilot |
| Events | |
| Anomaly | conflict : nmac non adherence : clearance |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance flight crew : took evasive action other |
| Consequence | Other |
| Miss Distance | horizontal : 150 vertical : 450 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Broke out on ILS at about 900' (raggedy overcast 850-950') when tower called a small aircraft Y, 'small aircraft Y...traffic alert turn left immediately...your instructions were to remain north of oakland.' (I had no traffic in sight.) I looked for traffic, a high wing small aircraft Y broke out of the clouds above us in a turn to the left (his left) and disappeared into the scud. Clearly not legal VFR nor legal special VFR. I didn't hear any further conversation with him and tower thanked me for being alert. My initial reaction was to not cause a fuss about this, but I'm sending this report because in fact tower had radar on line and apparently failed to protect my airspace during the approach. He could have killed me. He was not in an appropriate sector nor at an appropriate altitude and I don't know if he had a special VFR clearance or not. Maybe you can learn how this conflict came about!
Original NASA ASRS Text
Title: SMA DESCENDED THROUGH CLOUDS WITHOUT CLRNC AND HAD CLOSE PROX WITH SMT ON ILS APCH. TWR INTERVENED AND SMT TOOK EVASIVE ACTION.
Narrative: BROKE OUT ON ILS AT ABOUT 900' (RAGGEDY OVCST 850-950') WHEN TWR CALLED A SMA Y, 'SMA Y...TFC ALERT TURN LEFT IMMEDIATELY...YOUR INSTRUCTIONS WERE TO REMAIN N OF OAKLAND.' (I HAD NO TFC IN SIGHT.) I LOOKED FOR TFC, A HIGH WING SMA Y BROKE OUT OF THE CLOUDS ABOVE US IN A TURN TO THE LEFT (HIS LEFT) AND DISAPPEARED INTO THE SCUD. CLEARLY NOT LEGAL VFR NOR LEGAL SPECIAL VFR. I DIDN'T HEAR ANY FURTHER CONVERSATION WITH HIM AND TWR THANKED ME FOR BEING ALERT. MY INITIAL REACTION WAS TO NOT CAUSE A FUSS ABOUT THIS, BUT I'M SENDING THIS RPT BECAUSE IN FACT TWR HAD RADAR ON LINE AND APPARENTLY FAILED TO PROTECT MY AIRSPACE DURING THE APCH. HE COULD HAVE KILLED ME. HE WAS NOT IN AN APPROPRIATE SECTOR NOR AT AN APPROPRIATE ALT AND I DON'T KNOW IF HE HAD A SPECIAL VFR CLRNC OR NOT. MAYBE YOU CAN LEARN HOW THIS CONFLICT CAME ABOUT!
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.