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ZID developmental controller issued descent clearance at FL280 resulting in conflict as instructor was late in recognizing the developing operational error.
| Attributes | |
| ACN | 672482 |
| Time | |
| Date | 200509 |
| Place | |
| Locale Reference | navaid : pxv.vortac |
| State Reference | IN |
| Altitude | msl single value : 28000 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| 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 | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : vacating altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : developmental |
| ASRS Report | 672482 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | atc equipment : conflict alert other controllera |
| Resolutory Action | controller : issued new clearance controller : issued alert flight crew : took evasive action |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 21000 vertical : 70 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
I was checked out as radar associate at the sector. The radar controller was allowing me to get some radar experience by acting as radar controller while he oversaw. He turned to answer a question to someone else and I gave a clearance to descend an airplane when I thought they had lateral separation but they were only 3 1/2 mi apart (and diverging). When I put the new altitude in; I saw them turn red on uret and realized they must not be 5 mi apart; so I told the pilot to maintain FL290 but he had already descended 300 ft below it. The radar controller (after I told him what was going on) tried to correct it also; but it was too late.
Original NASA ASRS Text
Title: ZID DEVELOPMENTAL CTLR ISSUED DSCNT CLRNC AT FL280 RESULTING IN CONFLICT AS INSTRUCTOR WAS LATE IN RECOGNIZING THE DEVELOPING OPERROR.
Narrative: I WAS CHKED OUT AS RADAR ASSOCIATE AT THE SECTOR. THE RADAR CTLR WAS ALLOWING ME TO GET SOME RADAR EXPERIENCE BY ACTING AS RADAR CTLR WHILE HE OVERSAW. HE TURNED TO ANSWER A QUESTION TO SOMEONE ELSE AND I GAVE A CLRNC TO DSND AN AIRPLANE WHEN I THOUGHT THEY HAD LATERAL SEPARATION BUT THEY WERE ONLY 3 1/2 MI APART (AND DIVERGING). WHEN I PUT THE NEW ALT IN; I SAW THEM TURN RED ON URET AND REALIZED THEY MUST NOT BE 5 MI APART; SO I TOLD THE PLT TO MAINTAIN FL290 BUT HE HAD ALREADY DSNDED 300 FT BELOW IT. THE RADAR CTLR (AFTER I TOLD HIM WHAT WAS GOING ON) TRIED TO CORRECT IT ALSO; BUT IT WAS TOO LATE.
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.