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ZME controller experienced operational error at FL270 when misjudging the descent rate of an mem arrival that conflicted with another air carrier.
| Attributes | |
| ACN | 680417 |
| Time | |
| Date | 200512 |
| Place | |
| Locale Reference | navaid : hli.vortac |
| State Reference | MS |
| Altitude | msl single value : 27000 |
| Environment | |
| Flight Conditions | VMC |
| Weather Elements | Turbulence |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zme.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | A300 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Route In Use | arrival : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zme.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B737-800 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Route In Use | arrival : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 21 |
| ASRS Report | 680417 |
| 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 | atc equipment : conflict alert other controllera |
| Resolutory Action | controller : issued alert controller : issued new clearance |
| Consequence | faa : investigated |
| Miss Distance | vertical : 700 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Air carrier X was turned for spacing to mem. He was descending from FL300 to FL240. I thought he would get under air carrier Y at FL280. His descent was not good enough; so I turned both aircraft away from each other.
Original NASA ASRS Text
Title: ZME CTLR EXPERIENCED OPERROR AT FL270 WHEN MISJUDGING THE DSCNT RATE OF AN MEM ARR THAT CONFLICTED WITH ANOTHER ACR.
Narrative: ACR X WAS TURNED FOR SPACING TO MEM. HE WAS DSNDING FROM FL300 TO FL240. I THOUGHT HE WOULD GET UNDER ACR Y AT FL280. HIS DSCNT WAS NOT GOOD ENOUGH; SO I TURNED BOTH ACFT AWAY FROM EACH OTHER.
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.