Aircraft was descended through altitude assigned to another aircraft resulting in less than standard...

Attributes
ACN	108275
Time
Date	198903
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : lyh
State Reference	VA
Altitude	msl bound lower : 7000 msl bound upper : 7000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	descent : approach descent other
Route In Use	arrival other enroute airway : zdc
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : flight data
Qualification	controller : developmental
Experience	controller military : 4 controller non radar : 1
ASRS Report	108275
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	controller : issued new clearance flight crew : took evasive action none taken : detected after the fact
Consequence	faa : investigated
Miss Distance	horizontal : 12000 vertical : 800
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

The air carrier was descending to land at lynchburg from the southwest. I was trying to descend under en route traffic from the east. The carrier should have been started down earlier. I was performing non radar d-side functions when the radar operational error occurred.

Original NASA ASRS Text

Title: ACFT WAS DESCENDED THROUGH ALT ASSIGNED TO ANOTHER ACFT RESULTING IN LESS THAN STANDARD SEPARATION.

Narrative: THE ACR WAS DSNDING TO LAND AT LYNCHBURG FROM THE SW. I WAS TRYING TO DSND UNDER ENRTE TFC FROM THE E. THE CARRIER SHOULD HAVE BEEN STARTED DOWN EARLIER. I WAS PERFORMING NON RADAR D-SIDE FUNCTIONS WHEN THE RADAR OPERROR OCCURRED.

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.

Aircraft was descended through altitude assigned to another aircraft resulting in less than standard separation.