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Ont local controller expressed concern regarding ont class C airspace confign and traffic conflict between B737 and C172 in the vicinity of fonta intersection.
| Attributes | |
| ACN | 619231 |
| Time | |
| Date | 200406 |
| Day | Tue |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | intersection : fonta |
| State Reference | CA |
| Altitude | msl single value : 2800 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : ont.tower tower : phf.tower |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | tower : ont.tower |
| Make Model Name | Skyhawk 172/Cutlass 172 |
| Flight Phase | cruise : level |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : local |
| Qualification | pilot : instrument pilot : private |
| Experience | controller non radar : 7 controller radar : 2.5 |
| ASRS Report | 619231 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | conflict : airborne less severe |
| Independent Detector | aircraft equipment : tcas other controllera |
| Resolutory Action | controller : issued advisory flight crew : took evasive action |
| Miss Distance | horizontal : 3000 vertical : 150 |
| Supplementary | |
| Problem Areas | Airspace Structure Flight Crew Human Performance FAA |
| Primary Problem | Airspace Structure |
Narrative:
While working local control at ont ATCT, I observed a primary target squawking 1200 at 2300 ft, 6 mi east of ont airport, northbound. Aircraft X has checked onto frequency. I issued traffic to aircraft X who said he had the aircraft on TCASII. At fonta intersection, aircraft X said he had the aircraft in sight off his nose and lower. Aircraft X was observed turning south to avoid traffic then turning back to the final approach course. The VFR aircraft passed between the edge of ont's class C airspace and the OM (fonta), at GS altitude. This is unsafe, but perfectly legal way the airspace is currently set up. Ont's airspace needs to be changed before a major accident occurs.
Original NASA ASRS Text
Title: ONT LCL CTLR EXPRESSED CONCERN REGARDING ONT CLASS C AIRSPACE CONFIGN AND TFC CONFLICT BTWN B737 AND C172 IN THE VICINITY OF FONTA INTXN.
Narrative: WHILE WORKING LCL CTL AT ONT ATCT, I OBSERVED A PRIMARY TARGET SQUAWKING 1200 AT 2300 FT, 6 MI E OF ONT ARPT, NBOUND. ACFT X HAS CHKED ONTO FREQ. I ISSUED TFC TO ACFT X WHO SAID HE HAD THE ACFT ON TCASII. AT FONTA INTXN, ACFT X SAID HE HAD THE ACFT IN SIGHT OFF HIS NOSE AND LOWER. ACFT X WAS OBSERVED TURNING S TO AVOID TFC THEN TURNING BACK TO THE FINAL APCH COURSE. THE VFR ACFT PASSED BTWN THE EDGE OF ONT'S CLASS C AIRSPACE AND THE OM (FONTA), AT GS ALT. THIS IS UNSAFE, BUT PERFECTLY LEGAL WAY THE AIRSPACE IS CURRENTLY SET UP. ONT'S AIRSPACE NEEDS TO BE CHANGED BEFORE A MAJOR ACCIDENT OCCURS.
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.