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Landing gear actuation
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Main gear steering
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High lift control system (HLCS)(LE slats, TE flaps).
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777 AIRCRAFT MAINTENANCE MANUAL
MAIN HYDRAULIC SYSTEMS -INTRODUCTION
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MAIN HYDRAULIC SYSTEMS -INTERFACES
General
Four hydraulic interface module (HYDIM) cards are the interface between the hydraulic systems and other airplane systems.
The HYDIM cards receive and transmit data through the ASG cards and the systems ARINC 629 buses. The HYDIM cards also send and get signals through hard-wires.
ARINC 629 Interfaces
The HYDIM cards have these interfaces through the left and right systems ARINC 629 buses:
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Proximity sensor electronic unit (PSEU) (2)
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Flap/slat electronic unit (FSEU) (2)
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Overhead panel ARINC 629 system (OPAS)
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Electrical load management system (ELMS) power management panels (P110, P210, and P310)
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APU controller (APUC)
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Air supply and cabin pressure controller (ASCPC) (2)
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Cabin temperature controller (CTC) (2)
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Engine data interface unit (EDIU) (2)
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Autopilot flight director computer (AFDC) (3)
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Airplane information management system (AIMS).
The HYDIM cards also send and receive data through AIMS and the flight controls ARINC 629 buses for these components:
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Primary Flight Computers (3)
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Air Data Inertial Reference Unit (ADIRU).
Hard-wire Interfaces
The HYDIM cards also have these interfaces through hard-wires:
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Hydraulic system components
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Flight control shutoff valve (6)
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Truck tilt pressure sensors
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ELMS
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Warning electronic system (WES).
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MAIN HYDRAULIC SYSTEMS -INTERFACES
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MAIN HYDRAULIC SYSTEMS -CONTROLS
General
The controls for the hydraulic system pumps and the RAT manual deployment are on the hydraulic/RAT panel. This panel is on the P5 overhead panel.
The engine fire switches on the P8 aisle stand panel also control EDP operation.
Primary and Demand Pump Controls
Each primary pump has an alternate action switch. You select the pump OFF or ON.
Each demand pump has a rotary selector. You select the pump OFF, AUTO, or ON. When you select AUTO, the pump is in the demand mode and the HYDIM cards control the operation. When you select ON, the pump operates continuously.
Fault lights for each pump turn on if there is a pump overheat or pump low pressure condition.
Rat Deploy Switch
A RAT deploy switch at the top of the panel permits manual deployment of the ram air turbine. The RAT deploy switch is a momentary switch and is guarded.
This switch also has an unlocked light and a pressure light. The unlocked light turns on when the RAT is not up and locked. The pressure light turns on when the RAT supplies hydraulic pressure.
Engine Fire Switches
The engine fire switches isolate the engine if there is an engine fire. When you operate one of the fire switches, the hydraulic fluid supply to the related pump shuts off and the pump depressurizes.
Training Information Point
Because the EDP depressurization valve gets electrical power when the EDP control switch is OFF, keep the switch in the ON position. If the switch is in the OFF position for a long period, you should open the circuit breaker for the EDP solenoid.
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777 AIRCRAFT MAINTENANCE MANUAL
MAIN HYDRAULIC SYSTEMS -CONTROLS
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MAIN HYDRAULIC SYSTEMS -HYDRAULIC INTERFACE MODULE CARDS
General Training Information Point
Four hydraulic interface module (HYDIM) cards supply control, The HYDIM cards are software loadable. See the CMCS section indication, and other functions to the hydraulic system. The for more information about the data load (SECTION 45-10). HYDIM cards have these names:
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HYDIM left (L)
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HYDIM right (R)
* 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：777 AMM 飞机维护手册 液压 Hydraulic Power(6)
