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Traffic watch C172 made an unauthorized orbit and approach controller made an uncoord early turn-on with the commuter causing the aircraft to have an near midair collision.
| Attributes | |
| ACN | 314436 |
| Time | |
| Date | 199508 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : sna |
| State Reference | CA |
| Altitude | msl bound lower : 1800 msl bound upper : 1800 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : sna |
| Operator | other |
| Make Model Name | Skyhawk 172/Cutlass 172 |
| Operating Under FAR Part | Part 135 |
| Flight Phase | cruise other |
| Flight Plan | VFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Jetstream 31 |
| Operating Under FAR Part | Part 135 |
| Flight Phase | descent : approach |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : local |
| Qualification | controller : non radar |
| Experience | controller radar : 1 |
| ASRS Report | 314436 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : nmac non adherence : published procedure |
| Independent Detector | other controllera other flight crewa |
| Resolutory Action | flight crew : took evasive action other |
| Consequence | Other |
| Miss Distance | horizontal : 0 vertical : 200 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Deviation Pilot Deviation |
Narrative:
The traffic watch C172 was transitioning south on I5 at 1800 ft. The commuter was turned on early without coordination. I issued traffic to the C172. I then observed the C172 turning south. I asked his intention. He said he was orbiting. I asked if he had the jet stream in sight. He said yes. The incident occurred west of final 3 mi north. Had the jet stream been on final the aircraft would not have been a factor for each other. Or, had the C172 not turned south on his own, they would not have been a factor for each other. The procedure to coordinate all early turn-ONS was not utilized by the approach controller.
Original NASA ASRS Text
Title: TFC WATCH C172 MADE AN UNAUTH ORBIT AND APCH CTLR MADE AN UNCOORD EARLY TURN-ON WITH THE COMMUTER CAUSING THE ACFT TO HAVE AN NMAC.
Narrative: THE TFC WATCH C172 WAS TRANSITIONING S ON I5 AT 1800 FT. THE COMMUTER WAS TURNED ON EARLY WITHOUT COORD. I ISSUED TFC TO THE C172. I THEN OBSERVED THE C172 TURNING S. I ASKED HIS INTENTION. HE SAID HE WAS ORBITING. I ASKED IF HE HAD THE JET STREAM IN SIGHT. HE SAID YES. THE INCIDENT OCCURRED W OF FINAL 3 MI N. HAD THE JET STREAM BEEN ON FINAL THE ACFT WOULD NOT HAVE BEEN A FACTOR FOR EACH OTHER. OR, HAD THE C172 NOT TURNED S ON HIS OWN, THEY WOULD NOT HAVE BEEN A FACTOR FOR EACH OTHER. THE PROC TO COORDINATE ALL EARLY TURN-ONS WAS NOT UTILIZED BY THE APCH CTLR.
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.