Air carrier was climbed through an occupied altitude, resulting in less than standard separation.

Attributes
ACN	137321
Time
Date	199002
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : dqn airport : day
State Reference	OH
Altitude	msl bound lower : 10000 msl bound upper : 11000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : alo
Operator	common carrier : air carrier
Make Model Name	Light Transport, Low Wing, 2 Turboprop Eng
Flight Phase	cruise other
Route In Use	departure other enroute airway : zid
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	climbout : intermediate altitude
Route In Use	departure other
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller radar : 3
ASRS Report	137321
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 non adherence : published procedure
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance
Consequence	faa : investigated
Miss Distance	horizontal : 15000 vertical : 500
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Air carrier X departed day for tol, climbing to 10000'. Air carrier Y, day en route to jxn, was level at 11000', 10 mi behind air carrier X. Controller climbed air carrier X to 11000' thinking air carrier Y was at 14000'. When controller noted loss of sep, air carrier X was descended and air carrier Y climbed. Closest point was 2.5 mi, 500', with air carrier Y directly behind and overtaking air carrier X. While the ZID computer saw the aircraft were in conflict, the controller was never alerted to this. This problem is under examination at this time by the center.

Original NASA ASRS Text

Title: ACR WAS CLIMBED THROUGH AN OCCUPIED ALT, RESULTING IN LESS THAN STANDARD SEPARATION.

Narrative: ACR X DEPARTED DAY FOR TOL, CLBING TO 10000'. ACR Y, DAY ENRTE TO JXN, WAS LEVEL AT 11000', 10 MI BEHIND ACR X. CTLR CLBED ACR X TO 11000' THINKING ACR Y WAS AT 14000'. WHEN CTLR NOTED LOSS OF SEP, ACR X WAS DSNDED AND ACR Y CLBED. CLOSEST POINT WAS 2.5 MI, 500', WITH ACR Y DIRECTLY BEHIND AND OVERTAKING ACR X. WHILE THE ZID COMPUTER SAW THE ACFT WERE IN CONFLICT, THE CTLR WAS NEVER ALERTED TO THIS. THIS PROB IS UNDER EXAMINATION AT THIS TIME BY THE CENTER.

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.