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ZAU controller had an operational error at FL280 when incorrect readback was missed and aircraft descended through occupied altitude.
| Attributes | |
| ACN | 693345 |
| Time | |
| Date | 200604 |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | navaid : pmm.vor |
| State Reference | MI |
| Altitude | msl single value : 28000 |
| Environment | |
| Flight Conditions | IMC |
| Weather Elements | Rain |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : intermediate altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zau.artcc |
| Operator | general aviation : corporate |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller non radar : 3 controller radar : 18 controller time certified in position1 : 16 |
| ASRS Report | 693345 |
| Person 2 | |
| Affiliation | company : air carrier |
| 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 |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 13800 vertical : 500 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Aircraft #2 at FL280 was going direct enw and was a slow moving aircraft. Aircraft #1 was air carrier X at FL320 going to ord. I descended air carrier X to FL290 and issued a speed of 310 KTS. The aircraft read back FL190 and 310 KTS and descended through the aircraft at FL280.
Original NASA ASRS Text
Title: ZAU CTLR HAD AN OPERROR AT FL280 WHEN INCORRECT READBACK WAS MISSED AND ACFT DSNDED THROUGH OCCUPIED ALT.
Narrative: ACFT #2 AT FL280 WAS GOING DIRECT ENW AND WAS A SLOW MOVING ACFT. ACFT #1 WAS ACR X AT FL320 GOING TO ORD. I DSNDED ACR X TO FL290 AND ISSUED A SPD OF 310 KTS. THE ACFT READ BACK FL190 AND 310 KTS AND DSNDED THROUGH THE ACFT AT FL280.
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.