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.

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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.