777 AIRCRAFT MAINTENANCE MANUAL
DC GENERATION -SUBSYSTEMS INTRODUCTION
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DC GENERATION -COMPONENT LOCATIONS -FORWARD MEC
E3 Rack
These components are in the E3-2 shelf of the MEC:
*
TRU C2
*
TRU C1
*
Main battery charger
*
Towing static inverter
*
Static inverter.
Ground Service/Handling Power Panel
These relays are in the P320 ground service/handling power panel:
*
Main tow bus relay
*
Tow transfer control relay
*
DC towing relay
*
AC towing relay.
Main Battery Equipment
The main battery is on the floor between the E3 and the E4 racks. The main battery current sensor is forward of the right side of the E3 rack.
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DC GENERATION -COMPONENT LOCATIONS -FORWARD MEC
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DC GENERATION -COMPONENT LOCATIONS -AFT MEC
Right Power Management Panel
The DC tie relay is in the P210 power management panel.
E2 Rack
The right TRU is on the E2-2 shelf. The center FCDC battery is on the E2-5 shelf. The center PSA is on the E2-6 shelf.
E1 Rack
The left TRU is on the E1-1 shelf. The left FCDC battery and the left PSA are on the E1-6 shelf.
Standby Power Management Panel
These relays are in the P310 standby power management panel:
*
TRU C1 relay
*
TRU C2 relay
*
Capt-F/O bus tie relay
*
Main battery relay
*
Bat-capt isolation relay
*
Ground power relay
*
AC standby control relay
*
AC standby power relay
*
RAT deploy relay.
RAT GCU
The RAT GCU is below the P310 standby power management panel.
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DC GENERATION -COMPONENT LOCATIONS -AFT MEC
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DC GENERATION -COMPONENT LOCATIONS -CARGO COMPARTMENT RACKS
E5 RACK
The right PSA is on the E5-1 shelf. The right FCDC battery is on the E5-2 shelf.
E10 RACK
The APU battery charger is on the E10-1 shelf. The APU battery is on the E10-2 shelf.
The APU crank contactor and the APU battery current sensor attach to the aft side of the E10-2 shelf. But, you gain access to these components through the E12 access door.
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DC GENERATION -COMPONENT LOCATIONS -CARGO COMPARTMENT RACKS
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DC GENERATION -COMPONENT LOCATIONS -RAT
Component Locations
The RAT is in the wing-to-body fairing aft of the right main landing gear door. The RAT generator attaches to the RAT strut.
See the ac generation section for more information about the RAT (SECTION 24-20).
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777 AIRCRAFT MAINTENANCE MANUAL
DC GENERATION -COMPONENT LOCATIONS -RAT
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777 AIRCRAFT MAINTENANCE MANUAL
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24-30-00
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DC GENERATION -FUNCTIONAL DESCRIPTION
Normal Power
The dc generation system normally receives power from these ac power sources:
*
Left transfer bus
*
Right transfer bus
*
Ground service bus
*
Backup generator PMGs.
Four TRUs change the ac power from the transfer buses to dc power. Most of the dc loads on the airplane use this power.
The standby ac bus uses power directly from the left transfer bus.
Two battery chargers change the ac power from the ground service bus to dc power. This dc power charges the main and APU batteries. It also supplies power to the hot battery bus loads.
Three PSAs change the ac power from the backup generator PMGs to dc power. Flight control components use this dc power.
EFFECTIVITY BEJ ALL
Standby Power
When all ac power is lost, the main battery supplies power to the standby loads of the dc generation system until the RAT deploys (except those on the first officer’s flight instrument bus). The standby loads are on these buses:
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