ZDC controller takes action to separate a C130 and a B757 but separation is lost.

Attributes
ACN	510462
Time
Date	200105
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : zdc.artcc
State Reference	VA
Altitude	msl single value : 22000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zdc.artcc tower : pit.tower
Operator	other
Make Model Name	Hercules (C-130)
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zdc.artcc
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	cruise : enroute altitude change
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller military : 2 controller radar : 11
ASRS Report	510462
Person 2
Affiliation	government : military
Function	flight crew : captain oversight : pic
Events
Anomaly	conflict : airborne less severe non adherence : published procedure non adherence : required legal separation
Independent Detector	atc equipment : conflict alert aircraft equipment : tcas other controllera
Resolutory Action	controller : issued new clearance controller : separated traffic
Consequence	faa : investigated
Miss Distance	horizontal : 24600 vertical : 300
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Observed traffic situation between aircraft X and aircraft Y. Turned aircraft Y wbound to 270 degree heading to maintain separation.

Original NASA ASRS Text

Title: ZDC CTLR TAKES ACTION TO SEPARATE A C130 AND A B757 BUT SEPARATION IS LOST.

Narrative: OBSERVED TFC SIT BTWN ACFT X AND ACFT Y. TURNED ACFT Y WBOUND TO 270 DEG HDG TO MAINTAIN SEPARATION.

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.