<< >> NASA ASRS Report 632980, October 2004

A B767 flight crew experience odd left engine parameters. They are told by maintenance that the left engine eec alternator has failed. An emergency is declared. On final to ZZZ the left generator dropped off line.

Attributes
ACN	632980
Time
Date	200410
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : zzz.artcc
Altitude	msl single value : 35000
Aircraft 1
Controlling Facilities	artcc : zzz.artcc
Operator	common carrier : air carrier
Make Model Name	B767-300 and 300 ER
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Experience	flight time last 90 days : 150 flight time total : 13000 flight time type : 1500
ASRS Report	632980
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
ASRS Report	632967
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	other flight crewa
Resolutory Action	flight crew : declared emergency flight crew : landed in emergency condition
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

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.