B757 flight crew reports generator failure at top of descent after being dispatched with APU inoperative. Flight crew lands at nearest suitable which is not their filed destination.

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Attributes
ACN	756622
Time
Date	200701
Local Time Of Day	0001 To 0600
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	msl single value : 38000
Environment
Flight Conditions	VMC
Light	Dawn
Aircraft 1
Controlling Facilities	artcc : zzz.artcc
Operator	common carrier : air carrier
Make Model Name	Large Transport Low Wing 2 Turbojet Eng
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
Qualification	pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 200 flight time total : 15000 flight time type : 6000
ASRS Report	756622
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : eicas other flight crewa
Resolutory Action	flight crew : declared emergency flight crew : diverted to another airport flight crew : landed in emergency condition
Supplementary
Problem Areas	Maintenance Human Performance Aircraft Company Flight Crew Human Performance
Primary Problem	Aircraft

Narrative:

Flight was dispatched with APU inoperative. At top of descent; left generator failed. Ran checklist; generator reset failed. Landed at closest suitable airport; ZZZ; since stopping distance was not affected by single generator operation. Of note was the honeywell FMS 'alternate' airport feature. This showed time to 3 airports as identical from our position. Due to distance required to descend; ZZZ was chosen. Familiarity and landing flow made this the logical choice. Landing was uneventful. Crew coordination was excellent due to well thought out boeing QRH procedures; air carrier training; CRM and good help from ATC. Only negative was multiple requests for fuel and souls onboard from subsequent ATC sectors/facilities.

Original NASA ASRS Text

Title: B757 FLT CREW REPORTS GENERATOR FAILURE AT TOP OF DESCENT AFTER BEING DISPATCHED WITH APU INOPERATIVE. FLT CREW LANDS AT NEAREST SUITABLE WHICH IS NOT THEIR FILED DESTINATION.

Narrative: FLT WAS DISPATCHED WITH APU INOP. AT TOP OF DSCNT; L GENERATOR FAILED. RAN CHKLIST; GENERATOR RESET FAILED. LANDED AT CLOSEST SUITABLE ARPT; ZZZ; SINCE STOPPING DISTANCE WAS NOT AFFECTED BY SINGLE GENERATOR OP. OF NOTE WAS THE HONEYWELL FMS 'ALTERNATE' ARPT FEATURE. THIS SHOWED TIME TO 3 ARPTS AS IDENTICAL FROM OUR POS. DUE TO DISTANCE REQUIRED TO DSND; ZZZ WAS CHOSEN. FAMILIARITY AND LNDG FLOW MADE THIS THE LOGICAL CHOICE. LNDG WAS UNEVENTFUL. CREW COORD WAS EXCELLENT DUE TO WELL THOUGHT OUT BOEING QRH PROCS; ACR TRAINING; CRM AND GOOD HELP FROM ATC. ONLY NEGATIVE WAS MULTIPLE REQUESTS FOR FUEL AND SOULS ONBOARD FROM SUBSEQUENT ATC SECTORS/FACILITIES.

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.