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Near midair collision with probable WX balloon descended below far minimum altitude for flight over terrain.
| Attributes | |
| ACN | 171270 |
| Time | |
| Date | 199102 |
| Day | Sun |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : sau |
| State Reference | CA |
| Altitude | msl bound lower : 1000 msl bound upper : 1500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tracon : oak tower : msp |
| Operator | common carrier : air taxi |
| Make Model Name | Small Transport, Low Wing, 2 Recip Eng |
| Flight Phase | cruise other |
| Route In Use | enroute : direct |
| Flight Plan | VFR |
| Person 1 | |
| Affiliation | company : air taxi |
| Function | flight crew : single pilot |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 100 flight time total : 3000 flight time type : 300 |
| ASRS Report | 171270 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : nmac non adherence : far |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : took evasive action |
| Consequence | Other |
| Miss Distance | horizontal : 100 vertical : 100 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
While operating VFR under ATC traffic advisories over san francisco at 1500', saw a silver object in the light from my landing lights, ahead and slightly above me. Unsure of what it was, I dodged it in a rolling descent, dropping down about 400'. This put me at slightly less than 1000' AGL, the minimum altitude permissible over populated areas.
Original NASA ASRS Text
Title: NMAC WITH PROBABLE WX BALLOON DESCENDED BELOW FAR MINIMUM ALT FOR FLT OVER TERRAIN.
Narrative: WHILE OPERATING VFR UNDER ATC TFC ADVISORIES OVER SAN FRANCISCO AT 1500', SAW A SILVER OBJECT IN THE LIGHT FROM MY LNDG LIGHTS, AHEAD AND SLIGHTLY ABOVE ME. UNSURE OF WHAT IT WAS, I DODGED IT IN A ROLLING DSNT, DROPPING DOWN ABOUT 400'. THIS PUT ME AT SLIGHTLY LESS THAN 1000' AGL, THE MINIMUM ALT PERMISSIBLE OVER POPULATED AREAS.
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.