ARTCC radar controller had less than standard separation between an large transport descending and 1 descending to altitude vacated by the first large transport.

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Attributes
ACN	188577
Time
Date	199109
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : dbq
State Reference	IA
Altitude	msl bound lower : 29500 msl bound upper : 31000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zau
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	descent other
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	descent other
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller non radar : 19 controller radar : 18
ASRS Report	188577
Person 2
Affiliation	company : air carrier
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	none taken : anomaly accepted
Consequence	Other
Miss Distance	horizontal : 24000 vertical : 1500
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

3 commercial jets involved. I descended large transport X from FL310 to FL290 to miss large transport Z who I wasn't talking to and was climbing slowly. Behind the large transport Z was large transport Y who was descending to FL310. Large transport X did not level off in time (at FL290) to avoid a conflict with large transport Y. Both pilots saw the other aircraft. Large transport Z did not lose separation at any time.

Original NASA ASRS Text

Title: ARTCC RADAR CTLR HAD LTSS BTWN AN LGT DSNDING AND 1 DSNDING TO ALT VACATED BY THE FIRST LGT.

Narrative: 3 COMMERCIAL JETS INVOLVED. I DSNDED LGT X FROM FL310 TO FL290 TO MISS LGT Z WHO I WASN'T TALKING TO AND WAS CLBING SLOWLY. BEHIND THE LGT Z WAS LGT Y WHO WAS DSNDING TO FL310. LGT X DID NOT LEVEL OFF IN TIME (AT FL290) TO AVOID A CONFLICT WITH LGT Y. BOTH PLTS SAW THE OTHER ACFT. LGT Z DID NOT LOSE SEPARATION AT ANY TIME.

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.