3 engine widebody transport on A377 south of nogak maintaining FL350 saw traffic 12 O'clock closing. Turned on landing light and turned left. Traffic passed within 600 ft then noted rapid climb to FL370. Unable communication with traffic and no comment from center. TCASII warning prevented need for violent maneuver.

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Attributes
ACN	342793
Time
Date	199607
Day	Mon
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : mje
State Reference	FO
Altitude	msl bound lower : 35000 msl bound upper : 35000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : rjtg
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Navigation In Use	Other
Flight Phase	cruise other
Route In Use	enroute : pacific enroute : other oceanic
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	other : unknown
Flight Phase	cruise other
Route In Use	enroute : other oceanic enroute : pacific
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : flight engineer pilot : cfi pilot : atp
Experience	flight time last 90 days : 210 flight time total : 14000 flight time type : 1900
ASRS Report	342793
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : cfi pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 240 flight time total : 15000 flight time type : 3000
ASRS Report	342794
Events
Anomaly	conflict : airborne less severe non adherence : published procedure
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	faa : reviewed incident with flight crew
Miss Distance	vertical : 600
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

En route guam to narita airport, tokyo, japan. PF noted TCASII traffic dead ahead at same altitude with high closure rate. Immediately turned on landing lights and turned left. Traffic passed to right, opposite direction, indicating plus 600 ft on TCASII. Received TCASII TA warning. Traffic observed on TCASII to climb rapidly to FL370 after passing. Did not respond to call on common VHF frequency 128.95. Incident reported to tokyo radio. TCASII display/advance warning prevented potential mid-air and provided sufficient advance warning to negate any need for violent collision avoidance maneuvers.

Original NASA ASRS Text

Title: 3 ENG WDB ON A377 S OF NOGAK MAINTAINING FL350 SAW TFC 12 O'CLOCK CLOSING. TURNED ON LNDG LIGHT AND TURNED L. TFC PASSED WITHIN 600 FT THEN NOTED RAPID CLB TO FL370. UNABLE COM WITH TFC AND NO COMMENT FROM CTR. TCASII WARNING PREVENTED NEED FOR VIOLENT MANEUVER.

Narrative: ENRTE GUAM TO NARITA ARPT, TOKYO, JAPAN. PF NOTED TCASII TFC DEAD AHEAD AT SAME ALT WITH HIGH CLOSURE RATE. IMMEDIATELY TURNED ON LNDG LIGHTS AND TURNED L. TFC PASSED TO R, OPPOSITE DIRECTION, INDICATING PLUS 600 FT ON TCASII. RECEIVED TCASII TA WARNING. TFC OBSERVED ON TCASII TO CLB RAPIDLY TO FL370 AFTER PASSING. DID NOT RESPOND TO CALL ON COMMON VHF FREQ 128.95. INCIDENT RPTED TO TOKYO RADIO. TCASII DISPLAY/ADVANCE WARNING PREVENTED POTENTIAL MID-AIR AND PROVIDED SUFFICIENT ADVANCE WARNING TO NEGATE ANY NEED FOR VIOLENT COLLISION AVOIDANCE MANEUVERS.

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.