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ZID controller experienced operational error at FL230 by misjudging the descent rate of one of the aircraft involved.
| Attributes | |
| ACN | 670498 |
| Time | |
| Date | 200508 |
| Place | |
| Locale Reference | navaid : cct.vor |
| State Reference | IN |
| Altitude | msl single value : 23000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Regional Jet 200 ER&LR |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zid.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar controller : non radar controller : military |
| Experience | controller military : 4 controller non radar : 23 controller radar : 22 |
| ASRS Report | 670498 |
| 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 flight crew : took evasive action |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 24000 vertical : 700 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Air carrier X was issued a 350 degree heading to provide lateral separation with air carrier Y; and for spacing with other cvg inbounds in the high altitude stratum. Based on his rate of descent; air carrier Y was issued FL200 with sufficient time to provide positive vertical separation with air carrier X. Upon noticing the rate of descent of air carrier Y to be less than anticipated; I told him to expedite to FL200 and report leaving FL220. This was done to ensure vertical separation. Should have issued greater vectors; or descended air carrier X instead of air carrier Y. Bad judgement call.
Original NASA ASRS Text
Title: ZID CTLR EXPERIENCED OPERROR AT FL230 BY MISJUDGING THE DSCNT RATE OF ONE OF THE ACFT INVOLVED.
Narrative: ACR X WAS ISSUED A 350 DEG HDG TO PROVIDE LATERAL SEPARATION WITH ACR Y; AND FOR SPACING WITH OTHER CVG INBOUNDS IN THE HIGH ALT STRATUM. BASED ON HIS RATE OF DSCNT; ACR Y WAS ISSUED FL200 WITH SUFFICIENT TIME TO PROVIDE POSITIVE VERT SEPARATION WITH ACR X. UPON NOTICING THE RATE OF DSCNT OF ACR Y TO BE LESS THAN ANTICIPATED; I TOLD HIM TO EXPEDITE TO FL200 AND RPT LEAVING FL220. THIS WAS DONE TO ENSURE VERT SEPARATION. SHOULD HAVE ISSUED GREATER VECTORS; OR DSNDED ACR X INSTEAD OF ACR Y. BAD JUDGEMENT CALL.
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.