An medium large transport in cruise at FL290 disconnected the right generator due to high oil temper...

Attributes
ACN	640565
Time
Date	200411
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	msl single value : 33000
Environment
Flight Conditions	VMC
Weather Elements	Thunderstorm
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zzz.artcc
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	cruise : enroute altitude change cruise : level
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Experience	flight time last 90 days : 201 flight time total : 16837 flight time type : 4960
ASRS Report	640565
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	other flight crewa other flight crewb
Resolutory Action	none taken : detected after the fact
Consequence	other other
Supplementary
Problem Areas	Aircraft Chart Or Publication Environmental Factor Flight Crew Human Performance
Primary Problem	Aircraft

Narrative:

At cruise, the right generator was disconnected due to high CSD temperature, as per the QRH. Numerous attempts to start the APU had all failed due to altitude/temperature. Last attempt to start APU, prior to top of descent, was at FL290. Company was notified approaching ZZZ1. Request was made to relay our situation to ZZZ center so that we could proceed direct from point of contact to ZZZ center (no vectoring). Center was notified approximately 15 mins later. They had not been notified by company. ZZZ center declared us as an emergency and granted clearance direct to ZZZ area, FL290. Descending through FL200, the APU was started and the second generator was connected to the buss. Descending to an altitude where the APU could have been started and then continuing on to ZZZ was not a possibility due to the fuel load that was dispatched out of ZZZ2. Original fuel load was 19.3/7.1 over ZZZ with 5.9 over alternate of nearby airport. Captain's add fuel was 1000 pounds minimum fuel load severely limited the options of the crew and could have had serious consequences had the left generator experienced any difficulty.

Original NASA ASRS Text

Title: AN MLG IN CRUISE AT FL290 DISCONNECTED THE R GENERATOR DUE TO HIGH OIL TEMP. UNABLE TO START APU DUE TO CRUISE ALT REQUIRED IN ORDER TO REACH DESTINATION WITH FUEL LOAD.

Narrative: AT CRUISE, THE R GENERATOR WAS DISCONNECTED DUE TO HIGH CSD TEMP, AS PER THE QRH. NUMEROUS ATTEMPTS TO START THE APU HAD ALL FAILED DUE TO ALT/TEMP. LAST ATTEMPT TO START APU, PRIOR TO TOP OF DSCNT, WAS AT FL290. COMPANY WAS NOTIFIED APCHING ZZZ1. REQUEST WAS MADE TO RELAY OUR SIT TO ZZZ CTR SO THAT WE COULD PROCEED DIRECT FROM POINT OF CONTACT TO ZZZ CTR (NO VECTORING). CTR WAS NOTIFIED APPROX 15 MINS LATER. THEY HAD NOT BEEN NOTIFIED BY COMPANY. ZZZ CTR DECLARED US AS AN EMER AND GRANTED CLRNC DIRECT TO ZZZ AREA, FL290. DSNDING THROUGH FL200, THE APU WAS STARTED AND THE SECOND GENERATOR WAS CONNECTED TO THE BUSS. DSNDING TO AN ALT WHERE THE APU COULD HAVE BEEN STARTED AND THEN CONTINUING ON TO ZZZ WAS NOT A POSSIBILITY DUE TO THE FUEL LOAD THAT WAS DISPATCHED OUT OF ZZZ2. ORIGINAL FUEL LOAD WAS 19.3/7.1 OVER ZZZ WITH 5.9 OVER ALTERNATE OF NEARBY ARPT. CAPT'S ADD FUEL WAS 1000 LBS MINIMUM FUEL LOAD SEVERELY LIMITED THE OPTIONS OF THE CREW AND COULD HAVE HAD SERIOUS CONSEQUENCES HAD THE L GENERATOR EXPERIENCED ANY DIFFICULTY.

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.

An medium large transport in cruise at FL290 disconnected the right generator due to high oil temperature. Unable to start APU due to cruise altitude required in order to reach destination with fuel load.