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HYDRAULIC POWER -INDICATIONS
The hydraulic system valves are shown as circles with flow paths that turn to show the valve open or closed. The valve symbol is white with no flow line if the valve is commanded closed and green with a flow line if it is commanded open. The valve symbol is amber with an X in the circle if the valve position sensor does not match the valve commanded position. The valve symbol is low-intensity white if the valve position sensor is not valid.
Hydraulic Maintenance Page
The hydraulic maintenance page shows for each system:
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Hydraulic system pressures (psi)
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Hydraulic primary and demand pump data (pressure in psi, temperature in degrees C, selector position, and run status)
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RAT pump data (pressure in psi, speed in RPM, and position)
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Hydraulic system reservoir data (quantity in percent, pressure in psi, temperature in degrees C)
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Flight control shutoff valve positions
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Reserve and nose gear isolation valve positions.
The hydraulic maintenance page displays data in real time if the system sensor signals are valid. If a signal is not valid, then the corresponding maintenance page parameter is blank.
Training Information Point
When the hydraulic pumps are off, the system pressure indication shows the pressure in the hydraulic reservoirs.
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777 AIRCRAFT MAINTENANCE MANUAL
HYDRAULIC POWER -INDICATIONS
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D633W101-BEJ Jan 05/2004
HYDRAULIC POWER -OPERATIONAL TESTS
General
These are the operational tests for the hydraulic system:
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Air Driven Pump (ADP) (C1)
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Air Driven Pump (ADP) (C2)
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Center hydraulic isolation system (CHIS) test
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Heaters test
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Landing gear auto-off relay A test
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Landing gear auto-off relay B test.
Air Driven Pump Tests
The ADP tests are interactive tests to test the operation of each ADP. These functions are tested during these tests:
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Overspeed protection
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Secondary speed control
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Reserve power
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Auto/On control
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ADP heater operation
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Pressure and temperature indication.
These tests also reset an ADP after an overspeed shutdown.
Center Hydraulic Isolation System (CHIS) Test
This test makes sure CHIS control and indications operate normally. Both isolation valves close and open during this test.
Heaters Test
The heaters test makes sure that the RAT heater and the ADP heaters operate normally. This test starts the heaters, then stops them again.
Landing Gear Auto-Off Relay Tests
These tests make sure the landing gear auto-off relays operate correctly. The relays are energized and de-energized during the tests.
Training Information Point
Pneumatic power is necessary to do the air driven pump test.
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777 AIRCRAFT MAINTENANCE MANUAL
HYDRAULIC POWER -OPERATIONAL TESTS
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D633W101-BEJ Sep 05/2003
HYDRAULIC POWER -LRU REPLACEMENT TESTS
General
These are the LRU replacement tests for the hydraulic systems:
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HYDIM CL LRU replacement test
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HYDIM CR LRU replacement test
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HYDIM L LRU replacement test
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HYDIM R LRU replacement test.
HYDIM LRU Replacement Tests
A HYDIM LRU replacement test for each of the four HYDIM cards does a test of the HYDIM cards. 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(4)
