B767 receives egpws warning at FL300 when aircraft immediately below climbs through cleared altitude...

Attributes
ACN	675973
Time
Date	200510
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : rjtg.artcc
State Reference	FO
Altitude	msl bound lower : 29000 msl bound upper : 30000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : rjtg.artcc
Operator	common carrier : air carrier
Make Model Name	B767 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : rjtg.artcc
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
ASRS Report	675973
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	altitude deviation : overshoot conflict : airborne critical non adherence : clearance
Independent Detector	aircraft equipment : gpws other flight crewa
Resolutory Action	flight crew : took evasive action
Miss Distance	horizontal : 3000 vertical : 600
Supplementary
Problem Areas	Flight Crew Human Performance Airspace Structure
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

On departure out of narita; we were cleared direct to pabba waypoint on A590 and to final cruise altitude at FL300. There was an air carrier Y aircraft cleared to FL290. We were at cruise when air carrier Y was climbing directly beneath us to their cruise altitude of FL290. Air carrier Y overshot their assigned altitude and came within 600 ft MSL of us. Our egpws gave us an aural warning of 'terrain; terrain; pull up; pull up.' we immediately climbed to FL310 and informed tokyo control. Tokyo asked us to descend back to FL300. We descended back down as soon as air carrier Y returned to their assigned altitude of FL290. We thought it was odd we did not receive a TCAS warning; but have been trained to take action when we receive an egpws warning and did so. I was PF; but my first officer took evasive action as PF because I had just returned to my seat.

Original NASA ASRS Text

Title: B767 RECEIVES EGPWS WARNING AT FL300 WHEN ACFT IMMEDIATELY BELOW CLBS THROUGH CLRED ALT OF FL290.

Narrative: ON DEP OUT OF NARITA; WE WERE CLRED DIRECT TO PABBA WAYPOINT ON A590 AND TO FINAL CRUISE ALT AT FL300. THERE WAS AN ACR Y ACFT CLRED TO FL290. WE WERE AT CRUISE WHEN ACR Y WAS CLBING DIRECTLY BENEATH US TO THEIR CRUISE ALT OF FL290. ACR Y OVERSHOT THEIR ASSIGNED ALT AND CAME WITHIN 600 FT MSL OF US. OUR EGPWS GAVE US AN AURAL WARNING OF 'TERRAIN; TERRAIN; PULL UP; PULL UP.' WE IMMEDIATELY CLBED TO FL310 AND INFORMED TOKYO CTL. TOKYO ASKED US TO DSND BACK TO FL300. WE DSNDED BACK DOWN AS SOON AS ACR Y RETURNED TO THEIR ASSIGNED ALT OF FL290. WE THOUGHT IT WAS ODD WE DID NOT RECEIVE A TCAS WARNING; BUT HAVE BEEN TRAINED TO TAKE ACTION WHEN WE RECEIVE AN EGPWS WARNING AND DID SO. I WAS PF; BUT MY FO TOOK EVASIVE ACTION AS PF BECAUSE I HAD JUST RETURNED TO MY SEAT.

Data retrieved from NASA's ASRS site as of January 2009 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.

B767 receives egpws warning at FL300 when aircraft immediately below climbs through cleared altitude of FL290.