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Air carrier X descent through occupied altitude had less than standard separation from air carrier Y. System error.
| Attributes | |
| ACN | 250088 |
| Time | |
| Date | 199308 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : fim |
| State Reference | CA |
| Altitude | msl bound lower : 15000 msl bound upper : 15000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | Widebody, Low Wing, 4 Turbojet Eng |
| Navigation In Use | Other |
| Flight Phase | descent other |
| Route In Use | enroute : direct enroute airway : zla |
| Flight Plan | IFR |
| Aircraft 2 | |
| 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 : direct |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller military : 4 controller radar : 20 |
| ASRS Report | 250088 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation non adherence : published procedure |
| Independent Detector | other controllera |
| Resolutory Action | none taken : detected after the fact |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 21000 vertical : 300 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Air carrier X descending to land lax was cleared through the altitude (15000) of an medium large transport. Traffic was heavy and complex at the time and radar controller was being distracted by the necessity of watching the trainee/instructor on the d-side to insure that coordination was being accomplished. Cause: radar controller 'forgot' the heading assigned to medium large transport and thought that medium large transport would fall behind air carrier X by at least 5 NM.
Original NASA ASRS Text
Title: ACR X DSCNT THROUGH OCCUPIED ALT HAD LTSS FROM ACR Y. SYS ERROR.
Narrative: ACR X DSNDING TO LAND LAX WAS CLRED THROUGH THE ALT (15000) OF AN MLG. TFC WAS HVY AND COMPLEX AT THE TIME AND RADAR CTLR WAS BEING DISTRACTED BY THE NECESSITY OF WATCHING THE TRAINEE/INSTRUCTOR ON THE D-SIDE TO INSURE THAT COORD WAS BEING ACCOMPLISHED. CAUSE: RADAR CTLR 'FORGOT' THE HDG ASSIGNED TO MLG AND THOUGHT THAT MLG WOULD FALL BEHIND ACR X BY AT LEAST 5 NM.
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.