AFDS -MAIN EQUIPMENT CENTER COMPONENT LOCATION
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AFDS -BELOW FLIGHT DECK COMPONENT LOCATIONS
AFDS Component Locations
The backdrive actuators and their mechanical connections are under the flight deck floor.
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AFDS -BELOW FLIGHT DECK COMPONENT LOCATIONS
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AFDS -POWER INTERFACE
AFDS -Power Distribution
The left and right 28v dc buses supply AFDC and backdrive power to their onside AFDCs and the MCP. The 28v dc battery bus supplies AFDC power to the center AFDC. The hot battery bus supplies a second source of power to the warning function of each AFDC.
The MCP lights receive 5v ac panel light power. Signals from the master dim and test system control the brightness of the panel lights.
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777 AIRCRAFT MAINTENANCE MANUAL
AFDS -POWER INTERFACE
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AFDS -SYSTEMS ARINC 629 BUS INTERFACE
General
Each AFDC uses the onside systems bus to transmit and receive data.
AIMS Information
Each AIMS cabinet transmits vertical navigation (VNAV) and lateral navigation (LNAV) data to all three buses.
Control Display Unit (CDU)
Each control display unit (CDU) transmits and receives LNAV data from the left and right buses.
Flap Slat Electronics Unit (FSEU)
The left FSEU transmits flap position and slat position data to the left and center buses. The right FSEU transmits to the center and right buses.
Proximity Sensor Electronics Unit (PSEU)
The left PSEU transmits nose gear and nose gear door position to the left and center buses. The right PSEU transmits to the center and right buses.
Weight-on-Wheels (WOW) Cards
The WOW cards are part of the air/ground system (AGS). They transmit WOW data to the left and right buses. The center AFDC receives WOW data from the AFDC cross channel data buses.
Overhead Panel ARINC 629 System (OPAS)
The left OPAS controller transmits heading reference switch data on the left and right buses. The right OPAS controller transmits on the left and right buses.
Electrical Power System
The electrical load management system (ELMS), backup generator converter, and generator control units (GCU) send electrical system status to the left and right AFDCs. They transmit the data to the left and right buses. The center AFDC receives electrical system status from the cross channel data buses. Each AFDC sends bus isolation request to its on-side bus.
Air Supply and Cabin Pressurization Controllers (ASCPCs)
Each ASCPC receives AFDC mode status data from the left and right buses.
Hydraulic Interface Modules (HYDIMs)
The HYDIMs send hydraulic system status to the left and right AFDCs. All four HYDIMs transmit to left and right buses. The left and right AFDCs receive the four HYDIMs data on their on-side bus. The center AFDC receives hydraulic status data from the cross channel data buses.
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777 AIRCRAFT MAINTENANCE MANUAL
AFDS -SYSTEMS ARINC 629 BUS INTERFACE
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AFDC -FLIGHT CONTROLS ARINC 629 BUSES INTERFACE
AFDC
Each AFDC uses the on-side flight controls bus to transmit data. Each AFDC receives data from all three buses.
Primary Flight Control Computers
Each PFC uses the on-side flight controls bus to transmit data. Each PFC receives data from all three buses. Each AFDC receives data from all three PFCs.
The AFDCs send engage requests and autopilot commands to the PFCs. The AFDCs receive backdrive commands, flight deck control input positions, and engagement status.
Air Data Modules (ADMs)
Each ADM receives air/ground and engine running status from their on-side AFDCs.
Air Data Inertial Reference Unit (ADIRU)
Each AFDC receives attitude and air data from ADIRU on the left and right buses.
Secondary Attitude Air Data Reference Unit (SAARU)
Each AFDC receives attitude and air data from the secondary attitude air data reference unit (SAARU) on the center bus.
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