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ZID controller lost separation with a descending and an en route aircraft, confusing read back and ATC entered automated aircraft data information.
| Attributes | |
| ACN | 597598 |
| Time | |
| Date | 200310 |
| Day | Sat |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | navaid : pxv.vortac |
| State Reference | IN |
| Altitude | msl single value : 34600 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid.artcc tower : las.tower |
| Operator | common carrier : air carrier |
| Make Model Name | MD-80 Series (DC-9-80) Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : intermediate altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zid.artcc |
| Operator | general aviation : corporate |
| Make Model Name | Citation II S2/Bravo |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : supervisor |
| Qualification | controller : radar |
| Experience | flight time total : 1200 |
| ASRS Report | 597598 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 13 |
| ASRS Report | 597597 |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | atc equipment : conflict alert other controllera other controllerb |
| Resolutory Action | controller : issued alert controller : issued new clearance controller : issued advisory |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 12000 vertical : 1600 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Controller intended to descent the MFD80 to FL350 and subsequently to FL330. He entered FL350 into data block but issued FL330 and did not catch the error even when the MD80 read back FL330. He noticed the MD80 descending below his intended FL350 and immediately climbed the flight back to FL350. He was working alone during light traffic.
Original NASA ASRS Text
Title: ZID CTLR LOST SEPARATION WITH A DSNDING AND AN ENRTE ACFT, CONFUSING READ BACK AND ATC ENTERED AUTOMATED ACFT DATA INFO.
Narrative: CTLR INTENDED TO DSCNT THE MFD80 TO FL350 AND SUBSEQUENTLY TO FL330. HE ENTERED FL350 INTO DATA BLOCK BUT ISSUED FL330 AND DID NOT CATCH THE ERROR EVEN WHEN THE MD80 READ BACK FL330. HE NOTICED THE MD80 DSNDING BELOW HIS INTENDED FL350 AND IMMEDIATELY CLBED THE FLT BACK TO FL350. HE WAS WORKING ALONE DURING LIGHT TFC.
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.