Less than standard separation between 2 air carrier aircraft. Operational error.

Attributes
ACN	181342
Time
Date	199106
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : bib
State Reference	IL
Altitude	msl bound lower : 32000 msl bound upper : 33000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zid artcc : zkc
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other
Flight Phase	climbout : intermediate altitude descent other
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Medium Large 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 : 3 controller radar : 1
ASRS Report	181342
Person 2
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance none taken : detected after the fact
Consequence	faa : investigated
Miss Distance	horizontal : 16000 vertical : 110
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error Inter Facility Coordination Failure

Narrative:

WX was heavy due to major thunderstorms with many aircraft deviating for storms. Air carrier X was climbed from 290 to 330 on initial contact per letter of agreement with ZKC. ZKC center descended air carrier Y to 330 from 370 as data block indicated. I forgot air carrier X was on frequency and when contact was reestablished after 4 attempts air carrier X was issued an immediate descent to FL310. Pilot reported leaving 320 for 310. Air carrier Y was still talking to ZKC.

Original NASA ASRS Text

Title: LTSS BTWN 2 ACR ACFT. OPERATIONAL ERROR.

Narrative: WX WAS HVY DUE TO MAJOR TSTMS WITH MANY ACFT DEVIATING FOR STORMS. ACR X WAS CLBED FROM 290 TO 330 ON INITIAL CONTACT PER LETTER OF AGREEMENT WITH ZKC. ZKC CENTER DSNDED ACR Y TO 330 FROM 370 AS DATA BLOCK INDICATED. I FORGOT ACR X WAS ON FREQ AND WHEN CONTACT WAS REESTABLISHED AFTER 4 ATTEMPTS ACR X WAS ISSUED AN IMMEDIATE DSCNT TO FL310. PLT RPTED LEAVING 320 FOR 310. ACR Y WAS STILL TALKING TO ZKC.

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.