Narrative:

During cruise at FL350, noticed left engine parameters low, including fuel flow of 3000 pounds, no EICAS messages or other cockpit indications, right engine was at maximum cruise attempting to maintain airspeed. Requested lower flight level per qrc driftdown procedure. Contacted maintenance via dispatch. He informed us our left engine eec alternator failed, which would result in minimum fuel flow for duration of flight. After conferring with dispatch, decided to divert to ZZZ, declared an emergency, accomplished engine failure/shutdown checklist, but did not elect to shut down engine. Reviewed and briefed single engine approach/go around procedure and flew approach accordingly. Once in terminal area, left generator drive light illuminated and on short final left generator dropped off line and APU generator picked up load, approach and landing uneventful.

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Original NASA ASRS Text

Title: A B767 FLT CREW EXPERIENCE ODD L ENG PARAMETERS. THEY ARE TOLD BY MAINT THAT THE L ENG EEC ALTERNATOR HAS FAILED. AN EMER IS DECLARED. ON FINAL TO ZZZ THE L GENERATOR DROPPED OFF LINE.

Narrative: DURING CRUISE AT FL350, NOTICED L ENG PARAMETERS LOW, INCLUDING FUEL FLOW OF 3000 LBS, NO EICAS MESSAGES OR OTHER COCKPIT INDICATIONS, R ENG WAS AT MAX CRUISE ATTEMPTING TO MAINTAIN AIRSPD. REQUESTED LOWER FLT LEVEL PER QRC DRIFTDOWN PROC. CONTACTED MAINT VIA DISPATCH. HE INFORMED US OUR L ENG EEC ALTERNATOR FAILED, WHICH WOULD RESULT IN MINIMUM FUEL FLOW FOR DURATION OF FLT. AFTER CONFERRING WITH DISPATCH, DECIDED TO DIVERT TO ZZZ, DECLARED AN EMER, ACCOMPLISHED ENG FAILURE/SHUTDOWN CHKLIST, BUT DID NOT ELECT TO SHUT DOWN ENG. REVIEWED AND BRIEFED SINGLE ENG APCH/GAR PROC AND FLEW APCH ACCORDINGLY. ONCE IN TERMINAL AREA, L GENERATOR DRIVE LIGHT ILLUMINATED AND ON SHORT FINAL L GENERATOR DROPPED OFF LINE AND APU GENERATOR PICKED UP LOAD, APCH AND LNDG UNEVENTFUL.

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.