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ZID ARTCC radar controller misspoke and instructed a B72Q to descend to an occupied altitude resulting in a conflict.
| Attributes | |
| ACN | 556452 |
| Time | |
| Date | 200208 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | navaid : hyk.vortac |
| State Reference | KY |
| Altitude | msl single value : 23000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Do 328 TP (Turboprop) |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zid.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B727 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller limited radar : 9 controller non radar : 11 controller radar : 8 |
| ASRS Report | 556452 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Events | |
| Anomaly | conflict : airborne critical non adherence : required legal separation non adherence : published procedure |
| Independent Detector | atc equipment : conflict alert other controllera other controllerb other flight crewa other flight crewb |
| Resolutory Action | controller : issued new clearance |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
Narrative:
Aircraft #1 was level at FL230. I received the handoff on aircraft #2 which was to be descending to FL240. I told the sector above me that I would be leaving aircraft #2 at FL240 for a few moments because of my FL230 traffic. When aircraft #2 checked on frequency, he reported level at FL270 with FL240 in the data block. I called the high altitude controller to inform him of the situation and that I would be starting aircraft #2 down to FL240. I then inadvertently issued FL230 to aircraft 2 by mistake. Later on, I noticed the mode C on aircraft #2 as reading FL238 and I told him to maintain FL240. He responded that he was 'leveling at FL230, last cleared' as he passed a couple of mi to the left of aircraft #1.
Original NASA ASRS Text
Title: ZID ARTCC RADAR CTLR MISSPOKE AND INSTRUCTED A B72Q TO DSND TO AN OCCUPIED ALT RESULTING IN A CONFLICT.
Narrative: ACFT #1 WAS LEVEL AT FL230. I RECEIVED THE HDOF ON ACFT #2 WHICH WAS TO BE DSNDING TO FL240. I TOLD THE SECTOR ABOVE ME THAT I WOULD BE LEAVING ACFT #2 AT FL240 FOR A FEW MOMENTS BECAUSE OF MY FL230 TFC. WHEN ACFT #2 CHKED ON FREQ, HE RPTED LEVEL AT FL270 WITH FL240 IN THE DATA BLOCK. I CALLED THE HIGH ALT CTLR TO INFORM HIM OF THE SIT AND THAT I WOULD BE STARTING ACFT #2 DOWN TO FL240. I THEN INADVERTENTLY ISSUED FL230 TO ACFT 2 BY MISTAKE. LATER ON, I NOTICED THE MODE C ON ACFT #2 AS READING FL238 AND I TOLD HIM TO MAINTAIN FL240. HE RESPONDED THAT HE WAS 'LEVELING AT FL230, LAST CLRED' AS HE PASSED A COUPLE OF MI TO THE L OF ACFT #1.
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.