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Bjc tower controller describes an near midair collision between a C182 transitioning through the class D at pattern elevation and a C172 on left downwind for runway 11L. The C182 pilot had reported the C172 in sight several times; but apparently chose to pass with minimal separation; resulting in a verbal exchange on the tower frequency.
| Attributes | |
| ACN | 1200768 |
| Time | |
| Date | 201409 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | BJC.Airport |
| State Reference | CO |
| Aircraft 1 | |
| Make Model Name | Skylane 182/RG Turbo Skylane/RG |
| Operating Under FAR Part | Part 91 |
| Flight Phase | Cruise |
| Route In Use | None |
| Flight Plan | VFR |
| Aircraft 2 | |
| Make Model Name | Skyhawk 172/Cutlass 172 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | Descent |
| Flight Plan | VFR |
| Person 1 | |
| Function | Local |
| Qualification | Air Traffic Control Fully Certified |
| Events | |
| Anomaly | Conflict NMAC Deviation - Procedural Published Material / Policy |
Narrative:
A C182; departed boulder airport and called bjc tower; with the current ATIS; to request a transition through the airspace from northwest to southeast at 6;500 MSL. This request was approved as requested. Shortly after; a C172; was inbound from the north with a left base entry instruction for runway 11L at 7;400 MSL; descending. I exchanged traffic between the two aircraft. The C182 pilot reported that he had the C172 in sight; and that it would be 'no problem.' I informed the C172 pilot that the C182 pilot had him in sight. The C182 pilot told me two or three more times in the span of a few minutes that he still had the C172 in sight. After the two aircraft passed; the C172 reported only 200 feet separation. The two aircraft pilots began arguing on frequency about who should have given way; or gone behind. The C172 landed and the C182 continued southeast bound. These were two VFR aircraft in VMC conditions. If one aircraft had given the other one a wider berth; it may have prevented the C172 pilot from getting surprised.
Original NASA ASRS Text
Title: BJC Tower Controller describes an NMAC between a C182 transitioning through the Class D at pattern elevation and a C172 on left downwind for Runway 11L. The C182 pilot had reported the C172 in sight several times; but apparently chose to pass with minimal separation; resulting in a verbal exchange on the Tower frequency.
Narrative: A C182; departed Boulder airport and called BJC tower; with the current ATIS; to request a transition through the airspace from NW to SE at 6;500 MSL. This request was approved as requested. Shortly after; a C172; was inbound from the north with a left base entry instruction for runway 11L at 7;400 MSL; descending. I exchanged traffic between the two aircraft. The C182 pilot reported that he had the C172 in sight; and that it would be 'no problem.' I informed the C172 pilot that the C182 pilot had him in sight. The C182 pilot told me two or three more times in the span of a few minutes that he still had the C172 in sight. After the two aircraft passed; the C172 reported only 200 feet separation. The two aircraft pilots began arguing on frequency about who should have given way; or gone behind. The C172 landed and the C182 continued SE bound. These were two VFR aircraft in VMC conditions. If one aircraft had given the other one a wider berth; it may have prevented the C172 pilot from getting surprised.
Data retrieved from NASA's ASRS site 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.