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ZJX controller experienced a loss of separation at FL350 when student issued conflicting descent clearance.
| Attributes | |
| ACN | 706950 |
| Time | |
| Date | 200608 |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | navaid : amg.vortac |
| State Reference | GA |
| Altitude | msl single value : 35000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zjx.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B717 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : intermediate altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zjx.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B747 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller limited radar : 1 controller radar : 21 controller time certified in position1 : 17 controller time certified in position2 : 11 |
| ASRS Report | 706950 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : developmental controller : radar |
| Experience | controller radar : 11 |
| ASRS Report | 706951 |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance flight crew : took evasive action |
| Miss Distance | horizontal : 22200 vertical : 700 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
Narrative:
I assumed sector 49 with a trainee. After scanning over traffic with the trainee; only 1 situation needed resolving which he quickly took care of. I then started scanning down flight plans and data on the sector uret. I was specifically looking for improper rtes and 'checking of the boxes' in accordance with local directives revision to the part dated 2006. The sector had approximately 15 tracks and 25-27 flight plan entries on the uret to go through. There was no d-side at the sector when the trainee and I took the sector. While I was scanning the plans; my trainee descended air carrier X from FL360 to FL340. After a few seconds the air carrier questioned the descent and conflict alert activated. The trainee immediately re-assigned FL360 but separation was immediately lost (no warning when interim altitude or red alert happened on uret). Too much to monitor.
Original NASA ASRS Text
Title: ZJX CTLR EXPERIENCED A LOSS OF SEPARATION AT FL350 WHEN STUDENT ISSUED CONFLICTING DSCNT CLRNC.
Narrative: I ASSUMED SECTOR 49 WITH A TRAINEE. AFTER SCANNING OVER TFC WITH THE TRAINEE; ONLY 1 SITUATION NEEDED RESOLVING WHICH HE QUICKLY TOOK CARE OF. I THEN STARTED SCANNING DOWN FLT PLANS AND DATA ON THE SECTOR URET. I WAS SPECIFICALLY LOOKING FOR IMPROPER RTES AND 'CHKING OF THE BOXES' IN ACCORDANCE WITH LCL DIRECTIVES REVISION TO THE PART DATED 2006. THE SECTOR HAD APPROX 15 TRACKS AND 25-27 FLT PLAN ENTRIES ON THE URET TO GO THROUGH. THERE WAS NO D-SIDE AT THE SECTOR WHEN THE TRAINEE AND I TOOK THE SECTOR. WHILE I WAS SCANNING THE PLANS; MY TRAINEE DSNDED ACR X FROM FL360 TO FL340. AFTER A FEW SECONDS THE ACR QUESTIONED THE DSCNT AND CONFLICT ALERT ACTIVATED. THE TRAINEE IMMEDIATELY RE-ASSIGNED FL360 BUT SEPARATION WAS IMMEDIATELY LOST (NO WARNING WHEN INTERIM ALT OR RED ALERT HAPPENED ON URET). TOO MUCH TO MONITOR.
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.