Less than standard separation between air carrier and GA twin. Operational error.

Attributes
ACN	100940
Time
Date	198812
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : tys
State Reference	TN
Altitude	msl bound lower : 8000 msl bound upper : 8500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : tys
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Aircraft 2
Make Model Name	Small Transport, Low Wing, 2 Recip Eng
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : departure
Qualification	controller : radar
Experience	controller military : 4 controller radar : 29 controller supervisory : 13
ASRS Report	100940
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
Resolutory Action	none taken : detected after the fact
Consequence	faa : investigated
Miss Distance	horizontal : 3000 vertical : 500
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

I issued climb instructions to air carrier X west/O issuing an interim altitude below another IFR overflt aircraft, GA twin Y, at 8000'. The first aircraft passed through the second aircraft's altitude.

Original NASA ASRS Text

Title: LESS THAN STANDARD SEPARATION BETWEEN ACR AND GA TWIN. OPERATIONAL ERROR.

Narrative: I ISSUED CLB INSTRUCTIONS TO ACR X W/O ISSUING AN INTERIM ALT BELOW ANOTHER IFR OVERFLT ACFT, GA TWIN Y, AT 8000'. THE FIRST ACFT PASSED THROUGH THE SECOND ACFT'S ALT.

Data retrieved from NASA's ASRS site as of August 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.