(4)
28-Volt DC Center Bus
(a) The 28-volt DC center bus provides a third, independent DC power source during autoland conditions. The center bus is normally powered by the left main DC bus. If the main buses lose power, the center bus is powered from the hot battery bus.
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MAINTENANCE MANUAL
MAIN EQUIPMENT CENTER
28 Volt DC Power Distribution Component Location
Figure 1
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28 - Volt DC Power Distribution Block Diagram
Figure 2
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(5)
28V DC Standby Bus
(a) The 28-volt DC standby bus provides power to standby equipment and instruments. The DC standby bus is powered from the battery bus. The STBY POWER switch provides manual control of the standby buses (AMM 24-33-00/001).
(6)
28-Volt DC Ground Handling Bus
(a) The 28-volt DC ground handling bus provides power to ground support equipment. DC power for the bus is obtained through a transformer-rectifier unit connected to the 115-volt AC ground handling bus. The DC ground handling bus and circuit breakers are located in P34 panel.
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FAULT ISOLATION/MAINT MANUAL
28 VOLT DC POWER DISTRIBUTION
* SEE THE WDM EQUIPMENT LIST
28 Volt DC Power Distribution - Component Index
Figure 101
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E45051
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FAULT ISOLATION/MAINT MANUAL
MAIN EQUIPMENT CENTER ACCESS DOOR, 119BL
FLIGHT COMPARTMENT
MAIN EQUIPMENT CENTER
28 Volt DC Power Distribution - Component Location
Figure 102
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GROUND POWER TRANSFORMER-RECTIFIER UNIT - REMOVAL/INSTALLATION
______________________________________________________________
1. General
_______
A. This procedure has two tasks. The first task removes the ground power transformer rectifier unit (referred to as the unit) from the airplane. The second task installs the unit on the airplane.
TASK 24-54-01-024-001
2. Remove the Ground Power Transformer Rectifier Unit (Fig. 401)
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