Radar associate controller at ZDC witnessed operational error at FL250.

Attributes
ACN	684332
Time
Date	200601
Place
Locale Reference	atc facility : zdc.artcc
State Reference	VA
Altitude	msl single value : 25000
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zdc.artcc
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent : holding
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zdc.artcc
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : handoff position
Qualification	controller : developmental
Experience	controller limited radar : 3
ASRS Report	684332
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation
Independent Detector	other controllera
Resolutory Action	flight crew : took evasive action
Consequence	faa : investigated
Miss Distance	horizontal : 26400 vertical : 800
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Very busy session with 2 sectors combined. One was holding. Conflict alert went off after the fact. I was performing d-side functions.

Original NASA ASRS Text

Title: RADAR ASSOCIATE CTLR AT ZDC WITNESSED OPERROR AT FL250.

Narrative: VERY BUSY SESSION WITH 2 SECTORS COMBINED. ONE WAS HOLDING. CONFLICT ALERT WENT OFF AFTER THE FACT. I WAS PERFORMING D-SIDE FUNCTIONS.

Data retrieved from NASA's ASRS site as of January 2009 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.