Higher fuel flows due to deferred equipment plus the failure of the right engine generator which req...

Attributes
ACN	854044
Time
Date	200910
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	B777 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Takeoff
Flight Plan	IFR
Component
Aircraft Component	AC Generator/Alternator
Person 1
Function	Pilot Not Flying First Officer
Experience	Flight Crew Last 90 Days 200 Flight Crew Total 17000 Flight Crew Type 5000
Person 2
Function	Captain Pilot Flying
Experience	Flight Crew Last 90 Days 110 Flight Crew Total 21000 Flight Crew Type 900
Events
Anomaly	Aircraft Equipment Problem Critical

Narrative:

Dispatched to fly trans pacific with the right engine bleed psov (pressure shut off valve) locked closed; which causes low idle disagree EICAS message. We were in a MEL directed configuration for takeoff. While on the takeoff roll; we got an elec gen ctrl right eicas; and a elec gen right EICAS. We ran the appropriate checklists which called for one reset; (failed to reset); then called for disconnect. While trying to coordinate with maintenance control and dispatch when we got a satvoice lost EICAS alert and were disconnected. The conversation was to determine whether to land overweight or dump. We did not have enough fuel to continue to our destination with the APU running. We returned to the departure airport and landed overweight. Landing was smooth and speed was 160; gross weight was 521.5. Brake temperature tables showed we were in the melt zone so we were chalked.

Original NASA ASRS Text

Title: Higher fuel flows due to deferred equipment plus the failure of the right engine generator which required running the APU for the trans Pacific flight caused a B777 to return to the departure airport for an overweight landing.

Narrative: Dispatched to fly trans Pacific with the right engine bleed PSOV (Pressure Shut Off Valve) locked closed; which causes low idle disagree EICAS message. We were in a MEL directed configuration for takeoff. While on the takeoff roll; we got an ELEC GEN CTRL R Eicas; and a ELEC GEN R EICAS. We ran the appropriate checklists which called for one reset; (failed to reset); then called for disconnect. While trying to coordinate with Maintenance Control and Dispatch when we got a SATVOICE LOST EICAS alert and were disconnected. The conversation was to determine whether to land overweight or dump. We did not have enough fuel to continue to our destination with the APU running. We returned to the departure airport and landed overweight. Landing was smooth and speed was 160; gross weight was 521.5. Brake temperature tables showed we were in the melt zone so we were chalked.

Data retrieved from NASA's ASRS site as of April 2012 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.

Higher fuel flows due to deferred equipment plus the failure of the right engine generator which required running the APU for the trans pacific flight caused a B777 to return to the departure airport for an overweight landing.