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ZID controller experienced operational error at FL220 when incorrect altitude clearance issued by developmental controller was missed by the instructor and aircraft descended to occupied altitude.
| Attributes | |
| ACN | 706519 |
| Time | |
| Date | 200608 |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | navaid : shb.vortac |
| State Reference | IN |
| Altitude | msl single value : 22000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid.artcc tower : zzz.tower |
| Operator | common carrier : air carrier |
| Make Model Name | EMB ERJ 135 ER&LR |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zid.artcc |
| Operator | general aviation : corporate |
| Make Model Name | Learjet 35 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 21 controller time certified in position1 : 11 |
| ASRS Report | 706519 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : military controller : radar |
| Experience | controller military : 8 controller radar : 14 |
| ASRS Report | 707477 |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | atc equipment : conflict alert other controllera other controllerb other flight crewa |
| Resolutory Action | controller : issued alert controller : issued new clearance |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 6060 vertical : 200 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
I was conducting radar training at the huf radar position. Trainee gave descent clearance to aircraft Y to FL230. Pilot gave readback of '20.' before I could intercede; aircraft Y began a descent to FL220 and separation was lost. Supplemental information from acn 707477: aircraft #2 was level in-flight northbound at FL220. Aircraft #1 was given a descent clearance from FL240 to FL230. The readback from aircraft #1 was broken and not reverified by trainer or instructor because of other duties being accomplished. Aircraft #1 descended to FL220. Evasive action was taken by instructor to climb the aircraft back up to FL230.
Original NASA ASRS Text
Title: ZID CTLR EXPERIENCED OPERROR AT FL220 WHEN INCORRECT ALT CLRNC ISSUED BY DEVELOPMENTAL CTLR WAS MISSED BY THE INSTRUCTOR AND ACFT DSNDED TO OCCUPIED ALT.
Narrative: I WAS CONDUCTING RADAR TRAINING AT THE HUF RADAR POS. TRAINEE GAVE DSCNT CLRNC TO ACFT Y TO FL230. PLT GAVE READBACK OF '20.' BEFORE I COULD INTERCEDE; ACFT Y BEGAN A DSCNT TO FL220 AND SEPARATION WAS LOST. SUPPLEMENTAL INFO FROM ACN 707477: ACFT #2 WAS LEVEL INFLT NBOUND AT FL220. ACFT #1 WAS GIVEN A DSCNT CLRNC FROM FL240 TO FL230. THE READBACK FROM ACFT #1 WAS BROKEN AND NOT REVERIFIED BY TRAINER OR INSTRUCTOR BECAUSE OF OTHER DUTIES BEING ACCOMPLISHED. ACFT #1 DSNDED TO FL220. EVASIVE ACTION WAS TAKEN BY INSTRUCTOR TO CLB THE ACFT BACK UP TO FL230.
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.