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Controller missed wrong readback of an inbound air carrier resulting in less than standard separation with an outbound air carrier.
| Attributes | |
| ACN | 188394 |
| Time | |
| Date | 199109 |
| Day | Mon |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : pmm |
| State Reference | MI |
| Altitude | msl bound lower : 12300 msl bound upper : 13000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau tower : ord |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 3 Turbojet Eng |
| Flight Phase | cruise other |
| Route In Use | departure other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 3 Turbojet Eng |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | departure other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 4 |
| ASRS Report | 188394 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : developmental |
| Events | |
| Anomaly | altitude deviation : overshoot conflict : airborne less severe non adherence : published procedure non adherence : required legal separation other anomaly other |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 23400 vertical : 700 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
I was conducting OJT at sparta/squib sector. Air carrier X checked on frequency, ord direct grr at 12000. Air carrier X was cleared to 13000. Air carrier Y checked on frequency grr MMM V84 pappi ord level at 8000. Air carrier Y was cleared to 12000. Readback sounded correct. Traffic was issued to both aircraft. When air carrier Y was asked about his altitude, he said he was out of 13000 for 16000. Air carrier Y was turned to 180 degree heading and air carrier X was turned to 360 degree heading.
Original NASA ASRS Text
Title: CTLR MISSED WRONG READBACK OF AN INBOUND ACR RESULTING IN LTSS WITH AN OUTBOUND ACR.
Narrative: I WAS CONDUCTING OJT AT SPARTA/SQUIB SECTOR. ACR X CHKED ON FREQ, ORD DIRECT GRR AT 12000. ACR X WAS CLRED TO 13000. ACR Y CHKED ON FREQ GRR MMM V84 PAPPI ORD LEVEL AT 8000. ACR Y WAS CLRED TO 12000. READBACK SOUNDED CORRECT. TFC WAS ISSUED TO BOTH ACFT. WHEN ACR Y WAS ASKED ABOUT HIS ALT, HE SAID HE WAS OUT OF 13000 FOR 16000. ACR Y WAS TURNED TO 180 DEG HDG AND ACR X WAS TURNED TO 360 DEG HDG.
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.