A B767 crew reports an engine EPR anomaly at cruise on an oceanic flight. The aircraft returned to land. An emergency was not declared.

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Attributes
ACN	732894
Time
Date	200703
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	msl single value : 30000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zzz.artcc
Operator	common carrier : air carrier
Make Model Name	B767 Undifferentiated or Other Model
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
Qualification	pilot : atp
Experience	flight time last 90 days : 125 flight time total : 11176 flight time type : 886
ASRS Report	732894
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 180 flight time total : 8500 flight time type : 400
ASRS Report	732891
Events
Anomaly	aircraft equipment problem : less severe
Independent Detector	other flight crewa other flight crewb
Resolutory Action	aircraft : equipment problem dissipated flight crew : diverted to another airport
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

Approaching the top of climb the aircraft yawed. The left engine EPR was rolling back to approximately 1.30 to 1.26. Right EPR was normal 1.5. By the time I got my hand on the throttles the left engine EPR returned to normal. Contacted flight dispatcher/maintenance and a return to ZZZ1 was elected. Engine remained normal during return. Fuel dumped approximately 30000 pounds at 30000 ft MSL. Landed at approximately 332000 total gross weight. Vsi less than 200 FPM.

Original NASA ASRS Text

Title: A B767 CREW REPORTS AN ENG EPR ANOMALY AT CRUISE ON AN OCEANIC FLT. THE ACFT RETURNED TO LAND. AN EMERGENCY WAS NOT DECLARED.

Narrative: APCHING THE TOP OF CLB THE ACFT YAWED. THE L ENG EPR WAS ROLLING BACK TO APPROX 1.30 TO 1.26. R EPR WAS NORMAL 1.5. BY THE TIME I GOT MY HAND ON THE THROTTLES THE L ENG EPR RETURNED TO NORMAL. CONTACTED FLT DISPATCHER/MAINT AND A RETURN TO ZZZ1 WAS ELECTED. ENG REMAINED NORMAL DURING RETURN. FUEL DUMPED APPROX 30000 LBS AT 30000 FT MSL. LANDED AT APPROX 332000 TOTAL GROSS WT. VSI LESS THAN 200 FPM.

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.