2 widebody transport air carrier aircraft have an near midair collision while nearing lhr.

Attributes
ACN	134703
Time
Date	199001
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : det
State Reference	FO
Altitude	msl bound lower : 25000 msl bound upper : 25000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : egtt tower : avp
Operator	common carrier : air carrier
Make Model Name	Widebody, Low Wing, 3 Turbojet Eng
Navigation In Use	Other
Flight Phase	climbout : intermediate altitude
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	other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : second officer
Qualification	pilot : instrument pilot : commercial pilot : flight engineer
Experience	flight time last 90 days : 60 flight time total : 3000 flight time type : 400
ASRS Report	134703
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : cfi
Experience	flight time last 90 days : 200 flight time total : 16000
ASRS Report	135201
Events
Anomaly	conflict : nmac other spatial deviation
Independent Detector	atc equipment other atc equipment : unspecified other controllera
Resolutory Action	controller : issued new clearance other
Consequence	Other
Miss Distance	unspecified : 450
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Departed cdg for jfk. At a point 30 mi southeast of det the captain heard london tell air carrier B flight to make an immediate turn, then tell us to turn also. I was monitoring the nat track message at the time and did not hear the initial communications. I felt us turn sharply and pitch up. I turned radio #1 back up and heard the captain ask london how close it was. London replied less than 500'. I feel the captain's instant perception of the seriousness of the situation averted a disaster. We feel that the air carrier B jetliner (a widebody transport bnd from rom to lhr) was holding, and either made an error in navigation or was blown into our flight path.

Original NASA ASRS Text

Title: 2 WDB ACR ACFT HAVE AN NMAC WHILE NEARING LHR.

Narrative: DEPARTED CDG FOR JFK. AT A POINT 30 MI SE OF DET THE CAPT HEARD LONDON TELL ACR B FLT TO MAKE AN IMMEDIATE TURN, THEN TELL US TO TURN ALSO. I WAS MONITORING THE NAT TRACK MESSAGE AT THE TIME AND DID NOT HEAR THE INITIAL COMS. I FELT US TURN SHARPLY AND PITCH UP. I TURNED RADIO #1 BACK UP AND HEARD THE CAPT ASK LONDON HOW CLOSE IT WAS. LONDON REPLIED LESS THAN 500'. I FEEL THE CAPT'S INSTANT PERCEPTION OF THE SERIOUSNESS OF THE SITUATION AVERTED A DISASTER. WE FEEL THAT THE ACR B JETLINER (A WDB BND FROM ROM TO LHR) WAS HOLDING, AND EITHER MADE AN ERROR IN NAV OR WAS BLOWN INTO OUR FLT PATH.

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.