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ZID controller experienced operational error at 17000 ft when failing to hear an incorrect altitude readback that led to a descent through occupied altitude.
| Attributes | |
| ACN | 696558 |
| Time | |
| Date | 200605 |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | navaid : abb.vortac |
| State Reference | KY |
| Altitude | msl single value : 17000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid.artcc |
| Operator | general aviation : personal |
| Make Model Name | British Aerospace Undifferentiated or Other Model |
| Operating Under FAR Part | Part 91 |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zid.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | MD-82 |
| 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 : 1 controller military : 6 controller radar : 3 |
| ASRS Report | 696558 |
| Person 2 | |
| Affiliation | other |
| 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 |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 22200 vertical : 0 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Aircraft X checked on frequency and I told him to climb and maintain 16000 ft. He read back 17000 ft. I had aircraft Y inbound to cincinnati descending to 17000 ft. I did not hear the erroneous readback. Standard separation was lost as aircraft X passed behind aircraft Y there was d-side training going on; they were training instead of listening to the frequency and did not hear the bad readback either.
Original NASA ASRS Text
Title: ZID CTLR EXPERIENCED OPERROR AT 17000 FT WHEN FAILING TO HEAR AN INCORRECT ALT READBACK THAT LED TO A DSCNT THROUGH OCCUPIED ALT.
Narrative: ACFT X CHKED ON FREQ AND I TOLD HIM TO CLB AND MAINTAIN 16000 FT. HE READ BACK 17000 FT. I HAD ACFT Y INBOUND TO CINCINNATI DSNDING TO 17000 FT. I DID NOT HEAR THE ERRONEOUS READBACK. STANDARD SEPARATION WAS LOST AS ACFT X PASSED BEHIND ACFT Y THERE WAS D-SIDE TRAINING GOING ON; THEY WERE TRAINING INSTEAD OF LISTENING TO THE FREQ AND DID NOT HEAR THE BAD READBACK EITHER.
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.