Air carrier X had less than standard separation from air carrier Y. System error.

Attributes
ACN	139242
Time
Date	199003
Day	Mon
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : iad
State Reference	VA
Altitude	msl bound lower : 3000 msl bound upper : 3000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : iad
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	climbout : intermediate altitude
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	cruise other
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Experience	controller radar : 7
ASRS Report	139242
Person 2
Affiliation	government : faa
Function	controller : departure
Qualification	controller : radar
Events
Anomaly	conflict : airborne less severe non adherence : published procedure non adherence : required legal separation
Independent Detector	other flight crewa
Resolutory Action	none taken : detected after the fact
Consequence	Other
Miss Distance	horizontal : 6000 vertical : 300
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Intra Facility Coordination Failure Operational Error

Narrative:

Departure control coordinated eastbound turn through arrival airspace of air carrier X passenger jet, altitude 3000'. During this time period departure had been coordinating wbound turns through my sector. Workload was light, relaxed and I didn't actively listen to the coordination. I vectored air carrier Y, descending to 3000', north toward dulles. Air carrier X had air carrier Y in sight. Air carrier Y crew asked what the traffic ahead was. At first I didn't know what they were seeing since I removed the display of air carrier X traffic. Then it clicked and took me by surprise. The fault was with me, not listening to the departure controller's coordination, removing the display of air carrier X after coordination, since I thought it was going west instead of east.

Original NASA ASRS Text

Title: ACR X HAD LESS THAN STANDARD SEPARATION FROM ACR Y. SYSTEM ERROR.

Narrative: DEP CTL COORDINATED EBND TURN THROUGH ARR AIRSPACE OF ACR X PAX JET, ALT 3000'. DURING THIS TIME PERIOD DEP HAD BEEN COORDINATING WBOUND TURNS THROUGH MY SECTOR. WORKLOAD WAS LIGHT, RELAXED AND I DIDN'T ACTIVELY LISTEN TO THE COORD. I VECTORED ACR Y, DSNDING TO 3000', N TOWARD DULLES. ACR X HAD ACR Y IN SIGHT. ACR Y CREW ASKED WHAT THE TFC AHEAD WAS. AT FIRST I DIDN'T KNOW WHAT THEY WERE SEEING SINCE I REMOVED THE DISPLAY OF ACR X TFC. THEN IT CLICKED AND TOOK ME BY SURPRISE. THE FAULT WAS WITH ME, NOT LISTENING TO THE DEP CTLR'S COORD, REMOVING THE DISPLAY OF ACR X AFTER COORD, SINCE I THOUGHT IT WAS GOING W INSTEAD OF E.

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.