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An experimental aircraft (velocity) was told to report turning final for runway 11L for sequencing behind a C172 that was already on final. The velocity did not make the report and also did not have a transponder and when the reporter first saw the aircraft he was almost over the C172 on short final. The controller turned and climbed the velocity to prevent a collision.
| Attributes | |
| ACN | 378100 |
| Time | |
| Date | 199708 |
| Day | Sat |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : bjc |
| State Reference | CO |
| Altitude | msl bound lower : 5800 msl bound upper : 5800 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : bjc |
| Make Model Name | Skyhawk 172/Cutlass 172 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | descent : approach |
| Flight Plan | VFR |
| Aircraft 2 | |
| Operator | general aviation : personal |
| Make Model Name | Experimental |
| Operating Under FAR Part | Part 91 |
| Flight Phase | descent : approach |
| Flight Plan | VFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : local |
| Qualification | controller : non radar |
| ASRS Report | 378100 |
| Person 2 | |
| Affiliation | Other |
| Function | flight crew : single pilot |
| Qualification | pilot : private |
| Events | |
| Anomaly | conflict : nmac non adherence : clearance |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | Other |
| Miss Distance | horizontal : 100 vertical : 100 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
Narrative:
A C172 was on final for runway 11L, a velocity was to turn in 5 mi out behind him. The velocity had no transponder and was not visible in the haze. The controller was talking to several other aircraft at the time and never heard the velocity report turning inbound (as requested). When asked his position, the velocity reported on short final. The controller saw that the velocity was almost over the cessna. The controller instructed the velocity to climb and turn. Contributing factors: 1) controller workload with insufficient staffing. The controller had not had a break in over 5 hours. 2) haze and a background of mountains which made the aircraft difficult to see.
Original NASA ASRS Text
Title: AN EXPERIMENTAL ACFT (VELOCITY) WAS TOLD TO RPT TURNING FINAL FOR RWY 11L FOR SEQUENCING BEHIND A C172 THAT WAS ALREADY ON FINAL. THE VELOCITY DID NOT MAKE THE RPT AND ALSO DID NOT HAVE A XPONDER AND WHEN THE RPTR FIRST SAW THE ACFT HE WAS ALMOST OVER THE C172 ON SHORT FINAL. THE CTLR TURNED AND CLBED THE VELOCITY TO PREVENT A COLLISION.
Narrative: A C172 WAS ON FINAL FOR RWY 11L, A VELOCITY WAS TO TURN IN 5 MI OUT BEHIND HIM. THE VELOCITY HAD NO XPONDER AND WAS NOT VISIBLE IN THE HAZE. THE CTLR WAS TALKING TO SEVERAL OTHER ACFT AT THE TIME AND NEVER HEARD THE VELOCITY RPT TURNING INBOUND (AS REQUESTED). WHEN ASKED HIS POS, THE VELOCITY RPTED ON SHORT FINAL. THE CTLR SAW THAT THE VELOCITY WAS ALMOST OVER THE CESSNA. THE CTLR INSTRUCTED THE VELOCITY TO CLB AND TURN. CONTRIBUTING FACTORS: 1) CTLR WORKLOAD WITH INSUFFICIENT STAFFING. THE CTLR HAD NOT HAD A BREAK IN OVER 5 HRS. 2) HAZE AND A BACKGROUND OF MOUNTAINS WHICH MADE THE ACFT DIFFICULT TO SEE.
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.