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ZAU controller misinterps B757 routing, expecting a different direction turn, recognizing error when conflict develops with HS25 in descent.
| Attributes | |
| ACN | 493475 |
| Time | |
| Date | 200011 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | navaid : pmm.vortac |
| State Reference | MI |
| Altitude | msl bound lower : 30400 msl bound upper : 31000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau.artcc tower : clt.tower |
| Operator | common carrier : air carrier |
| Make Model Name | B757-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Route In Use | enroute : on vectors enroute airway : j70.airway |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zau.artcc |
| Operator | general aviation : corporate |
| Operating Under FAR Part | Part 91 |
| Route In Use | enroute : direct enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller non radar : 20 controller radar : 18 |
| ASRS Report | 493475 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure non adherence : required legal separation |
| Independent Detector | atc equipment : conflict alert other controllera |
| Resolutory Action | controller : issued new clearance |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 26400 vertical : 1600 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | Airspace Structure |
| Air Traffic Incident | Operational Error |
Narrative:
I had assumed the 'pmm-right' controller position only 3 or 4 mins prior to the error. During the relief briefing, I had been told that air carrier X (aircraft #1) had been handed off and switched to the super high sector above me, (requesting FL350) - my own sector only goes to FL310. Before I could even situation down, the super high controller called me to say that air carrier X had requested to level at FL310, and I approved this. Because air carrier X had been switched to the other controller, the flight progress strip had been torn down. I thought that air carrier X was routed pmm.J94..obk. Air carrier Y was handed to me at FL330, direct lan, a course that took him west to east, about 10 NM north of pmm. I descended aircraft Y to FL280 and went to sequence new flight strips. When I next looked at my radar, air carrier X had turned from pmm toward bae (badger, wi). At this point I still thought air carrier X was supposed to turn left, southwest, at pmm, not northwest. I turned air carrier X to a 260 degree heading and aircraft Y to turn left 20 degrees and to expedite his descent. After separation had been restored, both aircraft were put back on course. Air carrier X route, dtw.dunks.J70.bae.EAU4.msp. Aircraft Y route, las.dsm.lan.SPRTN3.det.
Original NASA ASRS Text
Title: ZAU CTLR MISINTERPS B757 ROUTING, EXPECTING A DIFFERENT DIRECTION TURN, RECOGNIZING ERROR WHEN CONFLICT DEVELOPS WITH HS25 IN DSCNT.
Narrative: I HAD ASSUMED THE 'PMM-R' CTLR POS ONLY 3 OR 4 MINS PRIOR TO THE ERROR. DURING THE RELIEF BRIEFING, I HAD BEEN TOLD THAT ACR X (ACFT #1) HAD BEEN HANDED OFF AND SWITCHED TO THE SUPER HIGH SECTOR ABOVE ME, (REQUESTING FL350) - MY OWN SECTOR ONLY GOES TO FL310. BEFORE I COULD EVEN SIT DOWN, THE SUPER HIGH CTLR CALLED ME TO SAY THAT ACR X HAD REQUESTED TO LEVEL AT FL310, AND I APPROVED THIS. BECAUSE ACR X HAD BEEN SWITCHED TO THE OTHER CTLR, THE FLT PROGRESS STRIP HAD BEEN TORN DOWN. I THOUGHT THAT ACR X WAS ROUTED PMM.J94..OBK. ACR Y WAS HANDED TO ME AT FL330, DIRECT LAN, A COURSE THAT TOOK HIM W TO E, ABOUT 10 NM N OF PMM. I DSNDED ACFT Y TO FL280 AND WENT TO SEQUENCE NEW FLT STRIPS. WHEN I NEXT LOOKED AT MY RADAR, ACR X HAD TURNED FROM PMM TOWARD BAE (BADGER, WI). AT THIS POINT I STILL THOUGHT ACR X WAS SUPPOSED TO TURN L, SW, AT PMM, NOT NW. I TURNED ACR X TO A 260 DEG HDG AND ACFT Y TO TURN L 20 DEGS AND TO EXPEDITE HIS DSCNT. AFTER SEPARATION HAD BEEN RESTORED, BOTH ACFT WERE PUT BACK ON COURSE. ACR X RTE, DTW.DUNKS.J70.BAE.EAU4.MSP. ACFT Y RTE, LAS.DSM.LAN.SPRTN3.DET.
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.