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ZMP controller incorrectly judges separation between 2 holding, descending aircraft, requiring the higher aircraft to execute a TCASII maneuver.
| Attributes | |
| ACN | 498970 |
| Time | |
| Date | 200101 |
| Day | Wed |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | navaid : fgt.vortac |
| State Reference | MN |
| Altitude | msl single value : 17000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zmp.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : enroute altitude change cruise : level |
| Route In Use | arrival : holding pattern |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zmp.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : enroute altitude change cruise : level |
| Route In Use | arrival : holding pattern |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 14 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude altitude deviation : undershoot non adherence : published procedure non adherence : required legal separation other spatial deviation |
| Independent Detector | atc equipment : conflict alert aircraft equipment : tcas other flight crewa |
| Resolutory Action | controller : issued new clearance flight crew : took evasive action |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 27000 vertical : 800 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
I was holding these 2 aircraft. I turned one (aircraft X) in and waited for the other (aircraft Y) to be abeam. I then turned the other (aircraft Y) in. The last one (aircraft Y) turned too fast. I then turned the last one (aircraft Y) to a 330 degree heading. I thought this was fine, but TCASII went off.
Original NASA ASRS Text
Title: ZMP CTLR INCORRECTLY JUDGES SEPARATION BTWN 2 HOLDING, DSNDING ACFT, REQUIRING THE HIGHER ACFT TO EXECUTE A TCASII MANEUVER.
Narrative: I WAS HOLDING THESE 2 ACFT. I TURNED ONE (ACFT X) IN AND WAITED FOR THE OTHER (ACFT Y) TO BE ABEAM. I THEN TURNED THE OTHER (ACFT Y) IN. THE LAST ONE (ACFT Y) TURNED TOO FAST. I THEN TURNED THE LAST ONE (ACFT Y) TO A 330 DEG HDG. I THOUGHT THIS WAS FINE, BUT TCASII WENT OFF.
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.