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Appears that the approach controller vectored the medium large transport through the final approach course for spacing, but didn't use visual separation and did not have legal IFR separation.
| Attributes | |
| ACN | 83571 |
| Time | |
| Date | 198803 |
| Day | Mon |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : sna |
| State Reference | CA |
| Altitude | msl bound lower : 3500 msl bound upper : 3500 |
| Environment | |
| Flight Conditions | Marginal |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tracon : sna |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other |
| Flight Phase | cruise other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport |
| Flight Phase | descent other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 16000 flight time type : 1300 |
| ASRS Report | 83571 |
| Person 2 | |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | other controllera other flight crewa |
| Resolutory Action | controller : issued new clearance other |
| Consequence | Other |
| Miss Distance | horizontal : 6000 vertical : 700 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Controller advised that there would be a vector through the final approach course with a vector back to final. Conflict occurred during turn back to final. Conflicting aircraft was visible at all times. Callback conversation with reporter revealed the following: aircraft was being vectored for ILS runway 19R. Appears that the other aircraft, another medium large transport was being vectored for spacing also. Approximately 500-700' vertical separation. Was marginal VFR sky partially obscured 3NM visibility. Aircraft were not on the same frequency. Traffic advisory had been given and other medium large transport was in sight at all times. Aircraft had at least 1 NM lateral separation at closest point.
Original NASA ASRS Text
Title: APPEARS THAT THE APCH CTLR VECTORED THE MLG THROUGH THE FINAL APCH COURSE FOR SPACING, BUT DIDN'T USE VISUAL SEPARATION AND DID NOT HAVE LEGAL IFR SEPARATION.
Narrative: CTLR ADVISED THAT THERE WOULD BE A VECTOR THROUGH THE FINAL APCH COURSE WITH A VECTOR BACK TO FINAL. CONFLICT OCCURRED DURING TURN BACK TO FINAL. CONFLICTING ACFT WAS VISIBLE AT ALL TIMES. CALLBACK CONVERSATION WITH REPORTER REVEALED THE FOLLOWING: ACFT WAS BEING VECTORED FOR ILS RWY 19R. APPEARS THAT THE OTHER ACFT, ANOTHER MLG WAS BEING VECTORED FOR SPACING ALSO. APPROX 500-700' VERTICAL SEPARATION. WAS MARGINAL VFR SKY PARTIALLY OBSCURED 3NM VISIBILITY. ACFT WERE NOT ON THE SAME FREQ. TFC ADVISORY HAD BEEN GIVEN AND OTHER MLG WAS IN SIGHT AT ALL TIMES. ACFT HAD AT LEAST 1 NM LATERAL SEPARATION AT CLOSEST POINT.
Data retrieved from NASA's ASRS site as of August 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.