A B767 crew, shortly after leveloff at FL300, experienced erratic performance from their left engine, requiring a reduction of power and a return to lgav.

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Attributes
ACN	558408
Time
Date	200208
Day	Tue
Local Time Of Day	1201 To 1800
Place
State Reference	FO
Altitude	msl single value : 3000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : lggg.artcc
Operator	common carrier : air carrier
Make Model Name	B767-300 and 300 ER
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Route In Use	enroute : other oceanic
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 200 flight time total : 10000 flight time type : 200
ASRS Report	558408
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : eng inst. oil press other flight crewa other flight crewb other other : 3
Resolutory Action	controller : provided flight assist flight crew : diverted to another airport flight crew : landed in emergency condition other
Consequence	faa : reviewed incident with flight crew other other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

After leveloff at FL300 the left engine rolled back and the engine instruments blanked momentarily while power xferred to the other generator. During this time the engine began to accelerate to normal engine indications. While the first officer flew the aircraft the autothrottle was disconnected and the left thrust lever was reduced. The relief pilot and I accomplished the engine limit-surge or stall checklist as we started a return to ath. During the return at partial power oil pressure momentarily dropped into the red. We reviewed the engine failure checklist and left thrust lever at idle. The fuel dump checklist was accomplished to get closer to maximum landing weight. An overweight approach to runway 3R ILS was flown using single engine procedures with the left thrust lever at idle and engine instruments indicating normal. Athens center and approach did a great job of giving us priority handling. Another factor that greatly contributed to the comfortable handling of this abnormal was the third pilot that is common in international operations. With the copilot flying and the relief pilot and myself handling checklists and setup this abnormal did not saturate the crew.

Original NASA ASRS Text

Title: A B767 CREW, SHORTLY AFTER LEVELOFF AT FL300, EXPERIENCED ERRATIC PERFORMANCE FROM THEIR L ENG, REQUIRING A REDUCTION OF PWR AND A RETURN TO LGAV.

Narrative: AFTER LEVELOFF AT FL300 THE L ENG ROLLED BACK AND THE ENG INSTS BLANKED MOMENTARILY WHILE PWR XFERRED TO THE OTHER GENERATOR. DURING THIS TIME THE ENG BEGAN TO ACCELERATE TO NORMAL ENG INDICATIONS. WHILE THE FO FLEW THE ACFT THE AUTOTHROTTLE WAS DISCONNECTED AND THE L THRUST LEVER WAS REDUCED. THE RELIEF PLT AND I ACCOMPLISHED THE ENG LIMIT-SURGE OR STALL CHKLIST AS WE STARTED A RETURN TO ATH. DURING THE RETURN AT PARTIAL PWR OIL PRESSURE MOMENTARILY DROPPED INTO THE RED. WE REVIEWED THE ENG FAILURE CHKLIST AND LEFT THRUST LEVER AT IDLE. THE FUEL DUMP CHKLIST WAS ACCOMPLISHED TO GET CLOSER TO MAX LNDG WT. AN OVERWT APCH TO RWY 3R ILS WAS FLOWN USING SINGLE ENG PROCS WITH THE L THRUST LEVER AT IDLE AND ENG INSTS INDICATING NORMAL. ATHENS CENTER AND APCH DID A GREAT JOB OF GIVING US PRIORITY HANDLING. ANOTHER FACTOR THAT GREATLY CONTRIBUTED TO THE COMFORTABLE HANDLING OF THIS ABNORMAL WAS THE THIRD PLT THAT IS COMMON IN INTL OPS. WITH THE COPLT FLYING AND THE RELIEF PLT AND MYSELF HANDLING CHKLISTS AND SETUP THIS ABNORMAL DID NOT SATURATE THE CREW.

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.