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Air carrier X had less than standard separation from air carrier Y. System error. Air carrier X descent to wrong altitude occupied altitude.
| Attributes | |
| ACN | 185372 |
| Time | |
| Date | 199108 |
| Day | Sun |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : pmm |
| State Reference | IL |
| Altitude | msl bound lower : 10000 msl bound upper : 10000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau |
| Operator | common carrier : air carrier |
| Make Model Name | Widebody, Low Wing, 3 Turbojet Eng |
| Navigation In Use | Other |
| Flight Phase | cruise other descent other |
| Route In Use | arrival other arrival star : star |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Light Transport, Low Wing, 2 Turboprop Eng |
| Flight Phase | cruise other |
| Route In Use | arrival other arrival star : star |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| ASRS Report | 185372 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : overshoot conflict : airborne less severe non adherence : required legal separation non adherence : published procedure non adherence : clearance |
| Independent Detector | other other : unspecified atc |
| Resolutory Action | none taken : detected after the fact |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 15000 vertical : 0 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Pilot Deviation Operational Error |
Narrative:
I was working 3 sectors combined (squib, sparta and kubbs) at sector 26 at chicago center. If I had only been working kubbs I believe this error would not have occurred. Air carrier X was cleared to cross pivot at 110 to stay on top of air carrier Y at 100 both on the PMM2 arrival for ord. Air carrier X read back 100 and I did not catch this because I was on the land-line for squib sector from ZMP. My instincts told me to go back and verify this altitude although I thought I heard 110. I did not get a chance to, because I was talking on a cleveland line. Also, I did not have a 'D' side which also probably would have prevented this error.
Original NASA ASRS Text
Title: ACR X HAD LTSS FROM ACR Y. SYS ERROR. ACR X DSCNT TO WRONG ALT OCCUPIED ALT.
Narrative: I WAS WORKING 3 SECTORS COMBINED (SQUIB, SPARTA AND KUBBS) AT SECTOR 26 AT CHICAGO CENTER. IF I HAD ONLY BEEN WORKING KUBBS I BELIEVE THIS ERROR WOULD NOT HAVE OCCURRED. ACR X WAS CLRED TO CROSS PIVOT AT 110 TO STAY ON TOP OF ACR Y AT 100 BOTH ON THE PMM2 ARR FOR ORD. ACR X READ BACK 100 AND I DID NOT CATCH THIS BECAUSE I WAS ON THE LAND-LINE FOR SQUIB SECTOR FROM ZMP. MY INSTINCTS TOLD ME TO GO BACK AND VERIFY THIS ALT ALTHOUGH I THOUGHT I HEARD 110. I DID NOT GET A CHANCE TO, BECAUSE I WAS TALKING ON A CLEVELAND LINE. ALSO, I DID NOT HAVE A 'D' SIDE WHICH ALSO PROBABLY WOULD HAVE PREVENTED THIS ERROR.
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.