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Air carrier X had less than standard separation from air carrier Y. Near midair collision. System error.
| Attributes | |
| ACN | 164008 |
| Time | |
| Date | 199011 |
| Day | Wed |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : sna |
| State Reference | CA |
| Altitude | msl bound lower : 8000 msl bound upper : 8000 |
| Environment | |
| Flight Conditions | VMC |
| 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 Other |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Transport, Low Wing, 2 Turboprop Eng |
| Flight Phase | cruise 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 : 240 flight time total : 22000 flight time type : 10000 |
| ASRS Report | 164008 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : nmac non adherence : published procedure non adherence : required legal separation |
| Independent Detector | other flight crewa |
| Resolutory Action | none taken : insufficient time |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 50 vertical : 50 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Their was no urgency, major heading changes of precautionary altitudes issued to air carrier X by the controller before the incident. Only after the 'near midair collision' did the controller give us a 90 degree heading change. Their were many aircraft targets in the area; none of which looked threatening. The controller should have asked us to level at 7000' or expedite to 9000'. By not advising us of a need of urgency, for a heading or altitude, we were led into a direct 'near midair collision' with air carrier Y at 8000' over orange county airport within 50' of our aircraft. Both aircraft were IFR under the same controller.
Original NASA ASRS Text
Title: ACR X HAD LESS THAN STANDARD SEPARATION FROM ACR Y. NMAC. SYSTEM ERROR.
Narrative: THEIR WAS NO URGENCY, MAJOR HDG CHANGES OF PRECAUTIONARY ALTS ISSUED TO ACR X BY THE CTLR BEFORE THE INCIDENT. ONLY AFTER THE 'NMAC' DID THE CTLR GIVE US A 90 DEG HDG CHANGE. THEIR WERE MANY ACFT TARGETS IN THE AREA; NONE OF WHICH LOOKED THREATENING. THE CTLR SHOULD HAVE ASKED US TO LEVEL AT 7000' OR EXPEDITE TO 9000'. BY NOT ADVISING US OF A NEED OF URGENCY, FOR A HDG OR ALT, WE WERE LED INTO A DIRECT 'NMAC' WITH ACR Y AT 8000' OVER ORANGE COUNTY ARPT WITHIN 50' OF OUR ACFT. BOTH ACFT WERE IFR UNDER THE SAME 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.