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Jax controller experienced less than standard separation at FL310 when descending aircraft through occupied altitude; citing fatigue and time on position as contributory.
| Attributes | |
| ACN | 703795 |
| Time | |
| Date | 200607 |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | navaid : amg.vortac |
| State Reference | GA |
| Altitude | msl single value : 31000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zjx.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Regional Jet 700 ER&LR |
| 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 | Regional Jet 700 ER&LR |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Experience | controller radar : 20 |
| ASRS Report | 703795 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 30000 vertical : 200 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
Narrative:
Time on position has been really heavy in our center for a long time. I believe this was a big factor -- just very tired; no doubt fatigue played a big role. Aircraft #1 was level FL310 northbound; aircraft #2 was at FL340 direct tlh. I descended aircraft to FL280. Once I realized they were a conflict; I issued traffic alert; turned and continued descending the aircraft till separation was re-established.
Original NASA ASRS Text
Title: JAX CTLR EXPERIENCED LTSS AT FL310 WHEN DSNDING ACFT THROUGH OCCUPIED ALT; CITING FATIGUE AND TIME ON POS AS CONTRIBUTORY.
Narrative: TIME ON POS HAS BEEN REALLY HVY IN OUR CTR FOR A LONG TIME. I BELIEVE THIS WAS A BIG FACTOR -- JUST VERY TIRED; NO DOUBT FATIGUE PLAYED A BIG ROLE. ACFT #1 WAS LEVEL FL310 NBOUND; ACFT #2 WAS AT FL340 DIRECT TLH. I DSNDED ACFT TO FL280. ONCE I REALIZED THEY WERE A CONFLICT; I ISSUED TFC ALERT; TURNED AND CONTINUED DSNDING THE ACFT TILL SEPARATION WAS RE-ESTABLISHED.
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.