Aircraft was issued a higher altitude by the ARTCC manual controller which resulted in less than standard separation from another aircraft.

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Attributes
ACN	149314
Time
Date	199006
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : lex
State Reference	KY
Altitude	msl bound lower : 12000 msl bound upper : 12000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zid tracon : oak
Operator	general aviation : corporate
Make Model Name	Small Transport, Low Wing, 2 Turbojet Eng
Flight Phase	climbout : intermediate altitude
Route In Use	departure other enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Small Transport, Low Wing, 2 Turboprop Eng
Flight Phase	climbout : intermediate altitude
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : non radar
Qualification	controller : radar
Experience	controller radar : 19
ASRS Report	149314
Person 2
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Events
Anomaly	conflict : airborne less severe non adherence : published procedure non adherence : required legal separation
Independent Detector	atc equipment other atc equipment : unspecified other controllera
Resolutory Action	controller : issued new clearance other
Consequence	faa : investigated
Miss Distance	horizontal : 24000 vertical : 400
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Issued an altitude that did not take into account aircraft performance. Callback conversation with reporter revealed the following: reporter stated he was held responsible for this system error because he issued a higher altitude to the pilot of small transport X. The reporter was working the d-side (manual) position. The ARTCC radar controller was controling small transport Y and it was on a heading of 180 degrees, climbing to 17000'. Small transport X was under the controller TRACON departure controller. Departure controller requested a higher altitude for small transport X and reporter issued 12000'. Small transport Y was a slow climbing aircraft and small transport X was just the opp. Small transport X was changed over to the ARTCC radar controller on a heading of 040 degrees which was converging with small transport Y. Small transport X contacted the ARTCC controller approaching 12000' and small transport Y was just leaving 11000'. Radar controller turned both aircraft but not before less than standard separation was lost. Reporter had been on the manual position for about 3 mins before the incident.

Original NASA ASRS Text

Title: ACFT WAS ISSUED A HIGHER ALT BY THE ARTCC MANUAL CTLR WHICH RESULTED IN LESS THAN STANDARD SEPARATION FROM ANOTHER ACFT.

Narrative: ISSUED AN ALT THAT DID NOT TAKE INTO ACCOUNT ACFT PERFORMANCE. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING: RPTR STATED HE WAS HELD RESPONSIBLE FOR THIS SYS ERROR BECAUSE HE ISSUED A HIGHER ALT TO THE PLT OF SMT X. THE RPTR WAS WORKING THE D-SIDE (MANUAL) POS. THE ARTCC RADAR CTLR WAS CTLING SMT Y AND IT WAS ON A HDG OF 180 DEGS, CLBING TO 17000'. SMT X WAS UNDER THE CTLR TRACON DEP CTLR. DEP CTLR REQUESTED A HIGHER ALT FOR SMT X AND RPTR ISSUED 12000'. SMT Y WAS A SLOW CLBING ACFT AND SMT X WAS JUST THE OPP. SMT X WAS CHANGED OVER TO THE ARTCC RADAR CTLR ON A HDG OF 040 DEGS WHICH WAS CONVERGING WITH SMT Y. SMT X CONTACTED THE ARTCC CTLR APCHING 12000' AND SMT Y WAS JUST LEAVING 11000'. RADAR CTLR TURNED BOTH ACFT BUT NOT BEFORE LESS THAN STANDARD SEPARATION WAS LOST. RPTR HAD BEEN ON THE MANUAL POS FOR ABOUT 3 MINS BEFORE THE INCIDENT.

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.