ARTCC radar controller vectored an medium large transport at same altitude too close to preceding medium large transport, caused momentary loss of separation.

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Attributes
ACN	182828
Time
Date	199107
Day	Sun
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : eno
State Reference	DE
Altitude	msl bound lower : 14500 msl bound upper : 15000
Environment
Flight Conditions	IMC
Light	Dusk
Aircraft 1
Controlling Facilities	artcc : zdc tower : btr
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	cruise other descent other
Route In Use	enroute airway : zdc
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other
Flight Phase	cruise other
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller radar : 35
ASRS Report	182828
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
Independent Detector	atc equipment other atc equipment : unspecified other controllera
Resolutory Action	controller : issued new clearance other
Consequence	Other
Miss Distance	horizontal : 18000 vertical : 500
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Medium large transport X en route phl turned east to insure intrail separation. Medium large transport Y eastbound from behind. Both at 15000 ft. Turned medium large transport X back left to dqo and he started to get too close to medium large transport Y. I descended medium large transport Y to 13000. Separation was lost and regained in the next 20 seconds.

Original NASA ASRS Text

Title: ARTCC RADAR CTLR VECTORED AN MLG AT SAME ALT TOO CLOSE TO PRECEDING MLG, CAUSED MOMENTARY LOSS OF SEPARATION.

Narrative: MLG X ENRTE PHL TURNED E TO INSURE INTRAIL SEPARATION. MLG Y EBOUND FROM BEHIND. BOTH AT 15000 FT. TURNED MLG X BACK L TO DQO AND HE STARTED TO GET TOO CLOSE TO MLG Y. I DSNDED MLG Y TO 13000. SEPARATION WAS LOST AND REGAINED IN THE NEXT 20 SECONDS.

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.