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Less than standard separation when small transport X is descended through the altitude of an overflt, small aircraft Y, near the airport.
| Attributes | |
| ACN | 99029 |
| Time | |
| Date | 198811 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : fld |
| State Reference | WI |
| Altitude | msl bound lower : 5600 msl bound upper : 6000 |
| Environment | |
| Flight Conditions | Marginal |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau |
| Operator | general aviation : corporate |
| Make Model Name | Small Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | descent : approach descent other |
| Route In Use | approach : straight in |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | general aviation : personal |
| Make Model Name | Small Aircraft, High Wing, 1 Eng, Fixed Gear |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| ASRS Report | 99029 |
| Person 2 | |
| Affiliation | Other |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | atc equipment other atc equipment : unspecified other controllera |
| Resolutory Action | controller : issued new clearance none taken : insufficient time |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 24000 vertical : 400 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
I was working small transport X into fld. He had been cleared for a straight in sdf 36 approach. It appeared initially that aircraft would be under overflt small aircraft Y. Conflict alert went off when aircraft were about 8 mi apart, same altitude. Small aircraft Y was given a turn (not acknowledged) and small transport X was told to expedite through 5000' (other overflt was at 6000'). Traffic was at a moderate level. I was going over the top of small aircraft Y with an inbound to osh. At the same time when small transport X was told to expedite his descent, it wasn't in time to avoid the operational error.
Original NASA ASRS Text
Title: LESS THAN STANDARD SEPARATION WHEN SMT X IS DESCENDED THROUGH THE ALT OF AN OVERFLT, SMA Y, NEAR THE ARPT.
Narrative: I WAS WORKING SMT X INTO FLD. HE HAD BEEN CLRED FOR A STRAIGHT IN SDF 36 APCH. IT APPEARED INITIALLY THAT ACFT WOULD BE UNDER OVERFLT SMA Y. CONFLICT ALERT WENT OFF WHEN ACFT WERE ABOUT 8 MI APART, SAME ALT. SMA Y WAS GIVEN A TURN (NOT ACKNOWLEDGED) AND SMT X WAS TOLD TO EXPEDITE THROUGH 5000' (OTHER OVERFLT WAS AT 6000'). TFC WAS AT A MODERATE LEVEL. I WAS GOING OVER THE TOP OF SMA Y WITH AN INBND TO OSH. AT THE SAME TIME WHEN SMT X WAS TOLD TO EXPEDITE HIS DSCNT, IT WASN'T IN TIME TO AVOID THE OPERATIONAL ERROR.
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.