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Cvg controller described a conflict event when a VFR aircraft assigned 6;500 elected to initiate a descent below a B747 assigned 6;000.
| Attributes | |
| ACN | 917941 |
| Time | |
| Date | 201011 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | CVG.TRACON |
| State Reference | KY |
| Aircraft 1 | |
| Make Model Name | B747 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Climb |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Skyhawk 172/Cutlass 172 |
| Flight Phase | Cruise |
| Flight Plan | VFR |
| Person 1 | |
| Function | Departure |
| Qualification | Air Traffic Control Fully Certified |
| Events | |
| Anomaly | ATC Issue All Types Conflict Airborne Conflict |
Narrative:
A C172 was transiting and was cleared through the cvg class bravo airspace at 6;500. A B747 was departing runway 27 climbing to 6;000. I exchanged traffic to both aircraft and both replied; 'looking.' as the aircraft were getting closer; the C172 keyed the frequency and said; 'he's coming right for us!' and then began a rapid descent into the B747. I issued an evasive maneuver to the B747 and the two aircraft did not hit each other. I asked the C172 what had happened and he said that it appeared the B747 was going to climb through him. The B747 continued on his route and the C172 landed at an adjacent facility and called the cvg TRACON as instructed. Recommendation; ATC wise; I believe that I did everything correctly. Maybe I could have issued an altitude 1;000 ft below the crossing VFR C172 to the B747; but I don't think it to be necessary.
Original NASA ASRS Text
Title: CVG Controller described a conflict event when a VFR aircraft assigned 6;500 elected to initiate a descent below a B747 assigned 6;000.
Narrative: A C172 was transiting and was cleared through the CVG Class Bravo airspace at 6;500. A B747 was departing Runway 27 climbing to 6;000. I exchanged traffic to both aircraft and both replied; 'Looking.' As the aircraft were getting closer; the C172 keyed the frequency and said; 'he's coming right for us!' and then began a rapid descent into the B747. I issued an evasive maneuver to the B747 and the two aircraft did not hit each other. I asked the C172 what had happened and he said that it appeared the B747 was going to climb through him. The B747 continued on his route and the C172 landed at an adjacent facility and called the CVG TRACON as instructed. Recommendation; ATC wise; I believe that I did everything correctly. Maybe I could have issued an altitude 1;000 FT below the crossing VFR C172 to the B747; but I don't think it to be necessary.
Data retrieved from NASA's ASRS site as of April 2012 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.