Flight crew of widebody transport departing narita and at 6000' MSL observed a widebody transport take evasive action to avoid, at same altitude. Narita control advised reporter they knew who the flight was.

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Attributes
ACN	137446
Time
Date	199002
Day	Sun
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : nrt
State Reference	FO
Altitude	msl bound lower : 6000 msl bound upper : 6000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : nrt
Operator	common carrier : air carrier
Make Model Name	Widebody, Low Wing, 4 Turbojet Eng
Navigation In Use	Other
Flight Phase	climbout : intermediate altitude cruise other
Route In Use	departure other
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Widebody, Low Wing, 3 Turbojet Eng
Navigation In Use	Other
Flight Phase	cruise other descent : approach
Route In Use	arrival other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : commercial pilot : instrument
Experience	flight time last 90 days : 150 flight time total : 18500
ASRS Report	137446
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : atp pilot : commercial
Experience	flight time last 90 days : 150 flight time total : 7100
ASRS Report	137592
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 2500 vertical : 0
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	other

Narrative:

We were departing on runway 16 departure, cleared to 7000' by departure control. We noticed lights at 12 O'clock and mentioned we better keep our eyes on them. Visibility was restr by haze and intermittent clouds and darkness, making it very difficult if not impossible to determine altitude of oncoming aircraft. First officer was flying aircraft and was just ready to take evasive action when the other aircraft veered to the left just as we reached 6000'. He passed off to our right at a distance estimated to be some what less than 1/2 mi distance. At the same time, the controller told us to maintain 5000', but by that time it was too late to have any effect on the situation. We asked for the identity of the other aircraft and were informed that it was a widebody transport flight.

Original NASA ASRS Text

Title: FLT CREW OF WDB DEPARTING NARITA AND AT 6000' MSL OBSERVED A WDB TAKE EVASIVE ACTION TO AVOID, AT SAME ALT. NARITA CTL ADVISED REPORTER THEY KNEW WHO THE FLT WAS.

Narrative: WE WERE DEPARTING ON RWY 16 DEP, CLRED TO 7000' BY DEP CTL. WE NOTICED LIGHTS AT 12 O'CLOCK AND MENTIONED WE BETTER KEEP OUR EYES ON THEM. VISIBILITY WAS RESTR BY HAZE AND INTERMITTENT CLOUDS AND DARKNESS, MAKING IT VERY DIFFICULT IF NOT IMPOSSIBLE TO DETERMINE ALT OF ONCOMING ACFT. F/O WAS FLYING ACFT AND WAS JUST READY TO TAKE EVASIVE ACTION WHEN THE OTHER ACFT VEERED TO THE L JUST AS WE REACHED 6000'. HE PASSED OFF TO OUR R AT A DISTANCE ESTIMATED TO BE SOME WHAT LESS THAN 1/2 MI DISTANCE. AT THE SAME TIME, THE CTLR TOLD US TO MAINTAIN 5000', BUT BY THAT TIME IT WAS TOO LATE TO HAVE ANY EFFECT ON THE SITUATION. WE ASKED FOR THE IDENTITY OF THE OTHER ACFT AND WERE INFORMED THAT IT WAS A WDB FLT.

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.