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Approach controller vectoring an air carrier SF340 for an approach to runway 25L from the north turned the aircraft too soon and had less than standard separation with an air carrier SF340 on final to runway 24R. Reporter says that altitude separation should have been used as well as the vector.
| Attributes | |
| ACN | 371549 |
| Time | |
| Date | 199706 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : lax |
| State Reference | CA |
| Altitude | msl bound lower : 2500 msl bound upper : 2500 |
| Environment | |
| Flight Conditions | Marginal |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : lax tower : bos |
| Operator | common carrier : air carrier |
| Make Model Name | SF 340B |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | SF 340B |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| Experience | controller radar : 5 |
| ASRS Report | 371549 |
| 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 | atc equipment other atc equipment : unspecified other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | Other |
| Miss Distance | horizontal : 6000 vertical : 400 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Air carrier X was at 2500 ft, was turned to 160 degree heading (base leg) to runway 25L. Air carrier Y was on final runway 24R at 2500 ft, at about 250 degree heading. Air carrier X was turned right next to air carrier Y on base instead of being turned right behind him or left above him. The controller immediately recognized the impending loss of separation and turned air carrier X back southeast and climbed him. Simultaneous approachs were in progress, and altitude should have been used (technique) to turn a runway 25L base over a runway 24R to make the sequence work more effectively. Altitude was not 'saved,' and the controller turned base too tight. There was a 50-70 ft wind from the northwest. Traffic was very busy and complex, but smooth. WX was marginal with clouds between approximately 1300-4100 ft, so visual separation could not be used.
Original NASA ASRS Text
Title: APCH CTLR VECTORING AN ACR SF340 FOR AN APCH TO RWY 25L FROM THE N TURNED THE ACFT TOO SOON AND HAD LTSS WITH AN ACR SF340 ON FINAL TO RWY 24R. RPTR SAYS THAT ALT SEPARATION SHOULD HAVE BEEN USED AS WELL AS THE VECTOR.
Narrative: ACR X WAS AT 2500 FT, WAS TURNED TO 160 DEG HDG (BASE LEG) TO RWY 25L. ACR Y WAS ON FINAL RWY 24R AT 2500 FT, AT ABOUT 250 DEG HDG. ACR X WAS TURNED RIGHT NEXT TO ACR Y ON BASE INSTEAD OF BEING TURNED RIGHT BEHIND HIM OR LEFT ABOVE HIM. THE CTLR IMMEDIATELY RECOGNIZED THE IMPENDING LOSS OF SEPARATION AND TURNED ACR X BACK SE AND CLBED HIM. SIMULTANEOUS APCHS WERE IN PROGRESS, AND ALT SHOULD HAVE BEEN USED (TECHNIQUE) TO TURN A RWY 25L BASE OVER A RWY 24R TO MAKE THE SEQUENCE WORK MORE EFFECTIVELY. ALT WAS NOT 'SAVED,' AND THE CTLR TURNED BASE TOO TIGHT. THERE WAS A 50-70 FT WIND FROM THE NW. TFC WAS VERY BUSY AND COMPLEX, BUT SMOOTH. WX WAS MARGINAL WITH CLOUDS BTWN APPROX 1300-4100 FT, SO VISUAL SEPARATION COULD NOT BE USED.
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.