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ZOB controller misjudges WX factors and pilot speed clearance compliance and loses separation with a DC9 flying the same route.
| Attributes | |
| ACN | 456745 |
| Time | |
| Date | 199912 |
| Day | Sun |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : zob.artcc |
| State Reference | OH |
| Environment | |
| Flight Conditions | Mixed |
| Light | Night |
| Aircraft 1 | |
| Make Model Name | Challenger CL604 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zob.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | DC-9 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 14.6 |
| ASRS Report | 456745 |
| 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 other anomaly |
| Independent Detector | other controllera |
| Resolutory Action | none taken : detected after the fact |
| Consequence | faa : investigated |
| Supplementary | |
| Problem Areas | ATC Human Performance Weather |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
I was trying to descend air carrier X to meet LOA altitude restr and expedited him under one aircraft and because of strong tailwinds and closure rate, was unable to clear the second aircraft. Air carrier X slowed his descent rate several times even though he was told to expedite.
Original NASA ASRS Text
Title: ZOB CTLR MISJUDGES WX FACTORS AND PLT SPD CLRNC COMPLIANCE AND LOSES SEPARATION WITH A DC9 FLYING THE SAME RTE.
Narrative: I WAS TRYING TO DSND ACR X TO MEET LOA ALT RESTR AND EXPEDITED HIM UNDER ONE ACFT AND BECAUSE OF STRONG TAILWINDS AND CLOSURE RATE, WAS UNABLE TO CLR THE SECOND ACFT. ACR X SLOWED HIS DSCNT RATE SEVERAL TIMES EVEN THOUGH HE WAS TOLD TO EXPEDITE.
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.