Air carrier X had less than standard separation from air carrier Y. System error.

Attributes
ACN	199151
Time
Date	199201
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : tvt
State Reference	OH
Altitude	msl bound lower : 31000 msl bound upper : 31000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zid
Operator	common carrier : air carrier
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	climbout : intermediate altitude cruise other
Route In Use	enroute : direct
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	cruise other
Route In Use	enroute : direct
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller radar : 1
ASRS Report	199151
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
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	none taken : anomaly accepted
Consequence	faa : investigated
Miss Distance	horizontal : 26400 vertical : 0
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Air carrier X departed pittsburgh, air carrier Y arriving dtw. Air carrier X, I thought, was climbing to FL280. Air carrier X reported on frequency climbing to FL310, and I did not hear this. Air carrier Y was level at FL310.

Original NASA ASRS Text

Title: ACR X HAD LTSS FROM ACR Y. SYS ERROR.

Narrative: ACR X DEPARTED PITTSBURGH, ACR Y ARRIVING DTW. ACR X, I THOUGHT, WAS CLBING TO FL280. ACR X RPTED ON FREQ CLBING TO FL310, AND I DID NOT HEAR THIS. ACR Y WAS LEVEL AT FL310.

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.