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ZLA controller experienced operational error at FL280 when failing to recognize decreasing separation; corrective action too late to be effective.
| Attributes | |
| ACN | 757598 |
| Time | |
| Date | 200710 |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : las.airport |
| State Reference | NV |
| Altitude | msl single value : 28000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zla.artcc |
| Operator | common carrier : air carrier general aviation : corporate |
| Make Model Name | Citation X |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zla.artcc |
| Make Model Name | Learjet 60 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | descent : approach landing : roll |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 17 controller time certified in position1 : 17 controller time certified in position2 : 5 |
| ASRS Report | 757598 |
| Person 2 | |
| Affiliation | company : corporate |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | conflict : airborne critical non adherence : required legal separation |
| Independent Detector | atc equipment : conflict alert aircraft equipment : tcas other controllera |
| Resolutory Action | controller : issued alert controller : issued new clearance flight crew : took evasive action |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 15000 vertical : 100 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
I was working 15 arrs into las with no d-side. I was time base metering into las; but the times were at 6 mins; or more so I turned off the ctas and went to 10 mi in-trail. I descended the learjet to FL240. He was at FL290. Then I turned to ksino for my sequencing at FL280. I then noticed the learjet was not descending fast enough; so I climbed him up to FL290. I turned the C750 40 degrees to the right and descended him. The C750 said he was responding to an RA and climbed into the learjet. Prior to all this my d-side was taken away from me by the supervisor. Also time base metering was in effect with no tmu flow to adjacent ctrs.
Original NASA ASRS Text
Title: ZLA CTLR EXPERIENCED OPERROR AT FL280 WHEN FAILING TO RECOGNIZE DECREASING SEPARATION; CORRECTIVE ACTION TOO LATE TO BE EFFECTIVE.
Narrative: I WAS WORKING 15 ARRS INTO LAS WITH NO D-SIDE. I WAS TIME BASE METERING INTO LAS; BUT THE TIMES WERE AT 6 MINS; OR MORE SO I TURNED OFF THE CTAS AND WENT TO 10 MI IN-TRAIL. I DSNDED THE LEARJET TO FL240. HE WAS AT FL290. THEN I TURNED TO KSINO FOR MY SEQUENCING AT FL280. I THEN NOTICED THE LEARJET WAS NOT DSNDING FAST ENOUGH; SO I CLBED HIM UP TO FL290. I TURNED THE C750 40 DEGS TO THE R AND DSNDED HIM. THE C750 SAID HE WAS RESPONDING TO AN RA AND CLBED INTO THE LEARJET. PRIOR TO ALL THIS MY D-SIDE WAS TAKEN AWAY FROM ME BY THE SUPVR. ALSO TIME BASE METERING WAS IN EFFECT WITH NO TMU FLOW TO ADJACENT CTRS.
Data retrieved from NASA's ASRS site as of January 2009 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.