Air carrier was issued immediate turn due to close proximity to another aircraft.

Attributes
ACN	135047
Time
Date	199001
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : det
State Reference	FO
Altitude	msl bound lower : 24000 msl bound upper : 24500
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Widebody, Low Wing, 3 Turbojet Eng
Navigation In Use	Other
Flight Phase	climbout : intermediate altitude
Route In Use	departure other enroute airway : egtt
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Widebody, Low Wing, 4 Turbojet Eng
Navigation In Use	Other
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 230 flight time total : 5000 flight time type : 720
ASRS Report	135047
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe non adherence : published procedure non adherence : required legal separation
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance
Consequence	Other
Miss Distance	horizontal : 0 vertical : 500
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

We departed charles de gaulle airport routinely, and were cleared to FL290 and climbing on UB4 route. At approximately 40 DME southeast of detling VOR (det), london control was heard to turn air carrier Y to the right. Our heading on UB4 was approximately 310 degree and we were climbing through FL245 when london control gave 'air carrier X' a turn to 360 degree. London control then told air carrier Y to turn 'immediately' to the right. We placed aircraft in a 30 degree bank to the right toward 360 degree and increased our climb rate. London control again asked air carrier Y if he was turning right. His reply was he was in a 45 degree bank to the right. As we rolled out on 360 degree and passing FL265 london control cleared us to proceed own navigation to detling and flight plan route. London control was asked by us as to separation, to which he replied 'less than 500''. Total time of incident was approximately 2 mins. Flight conditions were IMC at all times and other aircraft was never seen. London control, air carrier Y and air carrier X, all advised they would file reports.

Original NASA ASRS Text

Title: ACR WAS ISSUED IMMEDIATE TURN DUE TO CLOSE PROX TO ANOTHER ACFT.

Narrative: WE DEPARTED CHARLES DE GAULLE ARPT ROUTINELY, AND WERE CLRED TO FL290 AND CLIMBING ON UB4 ROUTE. AT APPROX 40 DME SE OF DETLING VOR (DET), LONDON CTL WAS HEARD TO TURN ACR Y TO THE RIGHT. OUR HDG ON UB4 WAS APPROX 310 DEG AND WE WERE CLIMBING THROUGH FL245 WHEN LONDON CTL GAVE 'ACR X' A TURN TO 360 DEG. LONDON CTL THEN TOLD ACR Y TO TURN 'IMMEDIATELY' TO THE RIGHT. WE PLACED ACFT IN A 30 DEG BANK TO THE RIGHT TOWARD 360 DEG AND INCREASED OUR CLIMB RATE. LONDON CTL AGAIN ASKED ACR Y IF HE WAS TURNING RIGHT. HIS REPLY WAS HE WAS IN A 45 DEG BANK TO THE RIGHT. AS WE ROLLED OUT ON 360 DEG AND PASSING FL265 LONDON CTL CLRED US TO PROCEED OWN NAVIGATION TO DETLING AND FLT PLAN ROUTE. LONDON CTL WAS ASKED BY US AS TO SEPARATION, TO WHICH HE REPLIED 'LESS THAN 500''. TOTAL TIME OF INCIDENT WAS APPROX 2 MINS. FLT CONDITIONS WERE IMC AT ALL TIMES AND OTHER ACFT WAS NEVER SEEN. LONDON CTL, ACR Y AND ACR X, ALL ADVISED THEY WOULD FILE REPORTS.

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.