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Air carrier X descent through occupied altitude in holding pattern had less than standard separation from air carrier Y. System error.
| Attributes | |
| ACN | 300144 |
| Time | |
| Date | 199503 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : ftz |
| State Reference | MO |
| Altitude | msl bound lower : 27000 msl bound upper : 27000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zkc |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent other |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise other |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 22 |
| ASRS Report | 300144 |
| 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 | other controllera |
| Resolutory Action | none taken : insufficient time |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 22500 vertical : 800 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
I was working the bum hi sector west of stl. Air carrier X was approaching the trake intersection via the sgf transition and descending to FL250 with holding instructions at trake. Air carrier Y was level at FL270 approaching trake from the west via the bum transition with holding instructions. Upon reaching trake, X made a wide turn to the outbound leg, Y arrived at trake later and turned inside X instead of following his arc. Because I was attempting to give a relief briefing at the time, I failed to notice in time.
Original NASA ASRS Text
Title: ACR X DSCNT THROUGH OCCUPIED ALT IN HOLDING PATTERN HAD LTSS FROM ACR Y. SYS ERROR.
Narrative: I WAS WORKING THE BUM HI SECTOR W OF STL. ACR X WAS APCHING THE TRAKE INTXN VIA THE SGF TRANSITION AND DSNDING TO FL250 WITH HOLDING INSTRUCTIONS AT TRAKE. ACR Y WAS LEVEL AT FL270 APCHING TRAKE FROM THE W VIA THE BUM TRANSITION WITH HOLDING INSTRUCTIONS. UPON REACHING TRAKE, X MADE A WIDE TURN TO THE OUTBOUND LEG, Y ARRIVED AT TRAKE LATER AND TURNED INSIDE X INSTEAD OF FOLLOWING HIS ARC. BECAUSE I WAS ATTEMPTING TO GIVE A RELIEF BRIEFING AT THE TIME, I FAILED TO NOTICE IN TIME.
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.