ARTCC radar controller descended an air carrier light transport through the altitude of an small aircraft with less than standard separation. Controller had data block overlap and didn't' see the potential conflict.

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Attributes
ACN	349155
Time
Date	199610
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : cip
State Reference	PA
Altitude	msl bound lower : 9000 msl bound upper : 9000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zob
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	descent other
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	general aviation : personal
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller radar : 20
ASRS Report	349155
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	atc equipment other atc equipment : unspecified other controllera
Resolutory Action	none taken : anomaly accepted
Consequence	Other
Miss Distance	horizontal : 24000 vertical : 700
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Air carrier X was descended through small aircraft Y due to traffic complexity and data block overlap. Be more observant and maybe not allow aircraft to fly through the arrival zone at such a key altitude.

Original NASA ASRS Text

Title: ARTCC RADAR CTLR DSNDED AN ACR LTT THROUGH THE ALT OF AN SMA WITH LTSS. CTLR HAD DATA BLOCK OVERLAP AND DIDN'T' SEE THE POTENTIAL CONFLICT.

Narrative: ACR X WAS DSNDED THROUGH SMA Y DUE TO TFC COMPLEXITY AND DATA BLOCK OVERLAP. BE MORE OBSERVANT AND MAYBE NOT ALLOW ACFT TO FLY THROUGH THE ARR ZONE AT SUCH A KEY ALT.

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.