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ZAB ARTCC radar controller descended en route traffic from FL290 to FL270. The flight conflicted with traffic at FL280.
| Attributes | |
| ACN | 557341 |
| Time | |
| Date | 200207 |
| Day | Wed |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | navaid : txo.vortac |
| State Reference | TX |
| Altitude | msl single value : 28000 |
| Environment | |
| Flight Conditions | VMC |
| Weather Elements | Turbulence |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zab.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | MD-80 Series (DC-9-80) Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : enroute altitude change |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zab.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | MD-80 Series (DC-9-80) 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 military : 4 controller radar : 23 controller time certified in position2 : 11 |
| ASRS Report | 557341 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | conflict : airborne critical non adherence : required legal separation non adherence : published procedure |
| Independent Detector | atc equipment : conflict alert atc equipment other atc equipment : radar aircraft equipment : tcas other controllera other flight crewa other flight crewb |
| Resolutory Action | controller : issued new clearance flight crew : took evasive action |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 15000 vertical : 600 |
| Supplementary | |
| Problem Areas | Environmental Factor Weather ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Aircraft #1 reported turbulence at FL290 and asked what the rides were like lower. I asked aircraft #2 at FL280 and he said it was smooth. Aircraft #1 asked for FL270. I checked for other aircraft, did not see any data blocks that were a factor, and descended aircraft #1 to FL270. I had some data block overlap and was moderately busy. Aircraft #2 reported traffic on TCASII and that he had visual. I turned both aircraft 20 degrees right until separation was re-established.
Original NASA ASRS Text
Title: ZAB ARTCC RADAR CTLR DSNDED ENRTE TFC FROM FL290 TO FL270. THE FLT CONFLICTED WITH TFC AT FL280.
Narrative: ACFT #1 RPTED TURB AT FL290 AND ASKED WHAT THE RIDES WERE LIKE LOWER. I ASKED ACFT #2 AT FL280 AND HE SAID IT WAS SMOOTH. ACFT #1 ASKED FOR FL270. I CHKED FOR OTHER ACFT, DID NOT SEE ANY DATA BLOCKS THAT WERE A FACTOR, AND DSNDED ACFT #1 TO FL270. I HAD SOME DATA BLOCK OVERLAP AND WAS MODERATELY BUSY. ACFT #2 RPTED TFC ON TCASII AND THAT HE HAD VISUAL. I TURNED BOTH ACFT 20 DEGS R UNTIL SEPARATION WAS RE-ESTABLISHED.
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.