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ARTCC radar controller descended a LR25 through an occupied altitude. The LR25 pilot was slow responding to descent instructions resulting in less than standard separation.
| Attributes | |
| ACN | 354999 |
| Time | |
| Date | 199612 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : eri |
| State Reference | PA |
| Altitude | msl bound lower : 37000 msl bound upper : 37000 |
| Aircraft 1 | |
| Controlling Facilities | artcc : zob tracon : oak |
| Operator | common carrier : air carrier |
| Make Model Name | B757 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | general aviation : personal |
| Make Model Name | Light Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller non radar : 2 controller radar : 7 flight time total : 2500 |
| ASRS Report | 354999 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : undershoot conflict : airborne less severe non adherence : clearance 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 : 12000 vertical : 500 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Nga Y, a LR25, was cleared to FL280 and told to leave FL350 in 2 mins or less. After a while it was realized nga Y was descending very slowly. Nga Y was told to expedite and report leaving FL350. No response was received twice. Aircraft was told to leave FL350 in 1 min. Nga Y was then turned to 240 degree heading and told to descend at 3000 FPM. Air carrier X was turned left to 360 degrees. Nga Y was turned to 180 degrees and told to report leaving FL350.
Original NASA ASRS Text
Title: ARTCC RADAR CTLR DSNDED A LR25 THROUGH AN OCCUPIED ALT. THE LR25 PLT WAS SLOW RESPONDING TO DSCNT INSTRUCTIONS RESULTING IN LTSS.
Narrative: NGA Y, A LR25, WAS CLRED TO FL280 AND TOLD TO LEAVE FL350 IN 2 MINS OR LESS. AFTER A WHILE IT WAS REALIZED NGA Y WAS DSNDING VERY SLOWLY. NGA Y WAS TOLD TO EXPEDITE AND RPT LEAVING FL350. NO RESPONSE WAS RECEIVED TWICE. ACFT WAS TOLD TO LEAVE FL350 IN 1 MIN. NGA Y WAS THEN TURNED TO 240 DEG HDG AND TOLD TO DSND AT 3000 FPM. ACR X WAS TURNED L TO 360 DEGS. NGA Y WAS TURNED TO 180 DEGS AND TOLD TO RPT LEAVING FL350.
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.