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Air carrier was descended through an occupied altitude resulting in less than standard separation with another air carrier.
| Attributes | |
| ACN | 115202 |
| Time | |
| Date | 198906 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : fwa |
| State Reference | IN |
| Altitude | msl bound lower : 21000 msl bound upper : 21300 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | descent other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | cruise other |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Experience | controller non radar : 6 controller radar : 4 |
| ASRS Report | 115202 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure non adherence : required legal separation |
| Independent Detector | atc equipment other atc equipment : unspecified other controllera |
| Resolutory Action | controller : issued new clearance |
| Consequence | Other |
| Miss Distance | horizontal : 16800 vertical : 300 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Air carrier X at FL230 swbnd whett direct rod was descended to 17000' per letter of agreement. Air carrier X was placed on 090 degree heading to avoid pointout to mie sector (ZID). Air carrier Y at FL210 vhp fwa dtw approximately 25 southwest of fwa when C/a activated with air carrier X. Air carrier X's mode C showed FL220. Controller keyed transmitter to level air carrier X at FL220. When radar updated mode C to show FL215, air carrier Y vectored on 360 degree heading as a result of air carrier X's updated mode C. Traffic called. Air carrier X told 'no delay' through FL200 and traffic issued. Air carrier Y reported traffic in sight.
Original NASA ASRS Text
Title: ACR WAS DESCENDED THROUGH AN OCCUPIED ALT RESULTING IN LESS THAN STANDARD SEPARATION WITH ANOTHER ACR.
Narrative: ACR X AT FL230 SWBND WHETT DIRECT ROD WAS DSNDED TO 17000' PER LETTER OF AGREEMENT. ACR X WAS PLACED ON 090 DEG HDG TO AVOID POINTOUT TO MIE SECTOR (ZID). ACR Y AT FL210 VHP FWA DTW APPROX 25 SW OF FWA WHEN C/A ACTIVATED WITH ACR X. ACR X'S MODE C SHOWED FL220. CTLR KEYED XMITTER TO LEVEL ACR X AT FL220. WHEN RADAR UPDATED MODE C TO SHOW FL215, ACR Y VECTORED ON 360 DEG HDG AS A RESULT OF ACR X'S UPDATED MODE C. TFC CALLED. ACR X TOLD 'NO DELAY' THROUGH FL200 AND TFC ISSUED. ACR Y RPTED TFC IN SIGHT.
Data retrieved from NASA's ASRS site as of August 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.