Narrative:

At approximately 20 ft after liftoff, I felt a strong yaw to the right indicative of power loss on the left engine. I immediately proceeded to fly the engine-out profile while we confirmed the emergency. We subsequently heard a series of loud banging noises, which was associated with numerous power fluctuations, along with a left engine maximum egt exceedence indicated on EICAS. The crew concurrently determined we were having a series of severe compressor stalls and referred to the appropriate qrc checklist. We declared an emergency while finishing the qrc checklist, notified dispatch while dumping fuel over lake michigan. After dumping about 20000 pounds, we received a message from dispatch via ACARS and had a discussion about ceasing the dump and returning to do an overweight landing. After confirming with dispatch we would be legal regarding our runway/performance limits for landing, we elected to return and do an overweight landing on runway 14R at ord. Supplemental information from acn 634703: I checked the engine parameters and observed fluctuating egt and a maximum exceedence egt of 704 degrees. I began working with the relief first officer to run the high egt/compressor stall qrc. Although we did not shut down the engine, we prepared for an engine failure on final, but elected to land flaps 30 degrees. Callback conversation with reporter acn 634490 revealed the following information: the reporter stated the cause of the left engine failure was one or more birds ingested into the left engine on liftoff. The reporter said the engine was replaced due to compressor damage and egt exceedence. Callback conversation with reporter acn 634703 revealed the following information: the reporter stated no information will be given on the incident or the maintenance action taken.

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Original NASA ASRS Text

Title: A B767-300 ON TKOF CLB AT 20 FT HAD COMPRESSOR STALL #1 ENG WITH HIGH EGT'S AND VIBRATIONS. DECLARED AN EMER AND DIVERTED. BIRD STRIKE AT LIFTOFF.

Narrative: AT APPROX 20 FT AFTER LIFTOFF, I FELT A STRONG YAW TO THE R INDICATIVE OF PWR LOSS ON THE L ENG. I IMMEDIATELY PROCEEDED TO FLY THE ENG-OUT PROFILE WHILE WE CONFIRMED THE EMER. WE SUBSEQUENTLY HEARD A SERIES OF LOUD BANGING NOISES, WHICH WAS ASSOCIATED WITH NUMEROUS PWR FLUCTUATIONS, ALONG WITH A L ENG MAX EGT EXCEEDENCE INDICATED ON EICAS. THE CREW CONCURRENTLY DETERMINED WE WERE HAVING A SERIES OF SEVERE COMPRESSOR STALLS AND REFERRED TO THE APPROPRIATE QRC CHKLIST. WE DECLARED AN EMER WHILE FINISHING THE QRC CHKLIST, NOTIFIED DISPATCH WHILE DUMPING FUEL OVER LAKE MICHIGAN. AFTER DUMPING ABOUT 20000 LBS, WE RECEIVED A MESSAGE FROM DISPATCH VIA ACARS AND HAD A DISCUSSION ABOUT CEASING THE DUMP AND RETURNING TO DO AN OVERWT LNDG. AFTER CONFIRMING WITH DISPATCH WE WOULD BE LEGAL REGARDING OUR RWY/PERFORMANCE LIMITS FOR LNDG, WE ELECTED TO RETURN AND DO AN OVERWT LNDG ON RWY 14R AT ORD. SUPPLEMENTAL INFO FROM ACN 634703: I CHKED THE ENG PARAMETERS AND OBSERVED FLUCTUATING EGT AND A MAX EXCEEDENCE EGT OF 704 DEGS. I BEGAN WORKING WITH THE RELIEF FO TO RUN THE HIGH EGT/COMPRESSOR STALL QRC. ALTHOUGH WE DID NOT SHUT DOWN THE ENG, WE PREPARED FOR AN ENG FAILURE ON FINAL, BUT ELECTED TO LAND FLAPS 30 DEGS. CALLBACK CONVERSATION WITH RPTR ACN 634490 REVEALED THE FOLLOWING INFO: THE RPTR STATED THE CAUSE OF THE L ENG FAILURE WAS ONE OR MORE BIRDS INGESTED INTO THE L ENG ON LIFTOFF. THE RPTR SAID THE ENG WAS REPLACED DUE TO COMPRESSOR DAMAGE AND EGT EXCEEDENCE. CALLBACK CONVERSATION WITH RPTR ACN 634703 REVEALED THE FOLLOWING INFO: THE RPTR STATED NO INFO WILL BE GIVEN ON THE INCIDENT OR THE MAINT ACTION TAKEN.

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.