*
Only the right system pressurized
*
No hydraulic system pressurized
the fluid can move to the right system.
To keep the movement of fluid between the right and center hydraulic systems to a minimum, do these steps:
*
Pressurize the right hydraulic system first
*
Remove the pressure from the right hydraulic system last.
WARNING: KEEP PERSONS AND EQUIPMENT CLEAR OF THE FLIGHT CONTROL SURFACES, THE THRUST REVERSERS, THE LANDING GEAR, AND THE DOORS FOR THE MAIN LANDING GEAR. THESE COMPONENTS CAN MOVE SUDDENLY WHEN YOU SUPPLY HYDRAULIC POWER. THIS CAN CAUSE INJURIES TO PERSONS AND DAMAGE TO EQUIPMENT.
CAUTION: WHEN YOU PRESSURIZE THE MAIN HYDRAULIC SYSTEMS, CAREFULLY MONITOR THE HYDRAULIC INDICATING SYSTEMS IN THE FLIGHT COMPARTMENT TO MAKE SURE THE SYSTEMS OPERATE SATISFACTORILY. IF THE HYDRAULIC FLUID BECOMES TOO HOT, STOP OPERATION OF THE SYSTEM.
CAUTION: DO NOT OPERATE THE HYDRAULIC PUMPS AFTER THE HYDRAULIC TEMPERATURE INDICATION IS MORE THAN 100C (212F) OR AFTER THE PUMP FAULT LIGHT COMES ON. IF YOU CONTINUE TO OPERATE THE PUMPS, THE HYDRAULIC FLUID CAN BECOME TOO HOT.
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General
Hydraulic system data shows on these displays:
*
Status display
*
Hydraulic synoptic display
*
Hydraulic maintenance page.
Status Display
The status display shows the pressure (psi) and the hydraulic reservoir fluid quantity (percent) for each hydraulic system.
The status display also shows EICAS status messages for the hydraulic systems.
The pressures shown at the top of the status display are provided by the system pressure sensors. If a system pressure signal becomes invalid (sensor failed out-of-range), then the highest valid pump pressure for the applicable system will be displayed.
The reservoir quantity fields at the top of the status display also show the suffix OF (overfill), LO (low), or RF (refill) if applicable for the reservoir fluid level. The LO and RF indications are shown in amber and the OF indication is shown in white. The RF and OF indications are shown only when the airplane is on the ground.
Hydraulic Synoptic
The hydraulic synoptic display shows a real time picture of the conditions in the three hydraulic systems.
The hydraulic synoptic display shows these data for normal hydraulic system operation:
*
Hydraulic system pressures (psi)
*
Hydraulic reservoir fluid quantities (percent)
*
Hydraulic pump status (green symbol -pump pressurized, white symbol -pump not pressurized)
*
Hydraulic system valve positions (open -green, closed -white).
Green flow lines go from the reservoir symbols through the pump symbols to the airplane systems symbols when the pumps operate.
The synoptic display also shows these non-normal conditions:
*
Pump failure (amber symbol)
*
Pump pressure sensor failure (low-intensity white symbol)
*
Valve failure (amber symbol)
*
Valve position sensor failure (low-intensity white symbol)
*
Pump overheat condition (amber OVHT).
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The pressures shown at the bottom of the synoptic display are provided by the system pressure sensors. If a system pressure signal becomes invalid (sensor failed out-of-range), then the highest valid pump pressure for the applicable system will be displayed. The system pressure is shown with white numerals for pressures greater than 1200 psi and with amber numerals for pressures less than 1200 psi. For some operating conditions (center system pressurized only by the RAT or center system isolated and pressurized only by ACMP C1), the center system pressure is shown in amber even though the isolated portion of the hydraulic system is pressurized to more than 1200 psi (the system pressure sensor is not always included in the isolated portion of the system).
The reservoir quantity fields also show the suffix OF (overfill), LO (low), or RF (refill) if applicable for the reservoir fluid level.
Pressurized hydraulic fluid paths are shown as a wide green line. Unpressurized paths are shown as a thin white line. Flow direction is indicated by an arrowhead.
Each hydraulic pump is shown as a box on the synoptic display. The upper boxes are for the primary pumps and the lower boxes are for the demand pumps. The pump symbol is white with no flow line if the pump is commanded off and green if the pump is commanded on and the pump pressure is normal. The pump symbol is amber with an X in the box if the pump is commanded on and the pump pressure is low. The pump symbol is low-intensity white if the pump pressure sensor is not valid (failed out-of-range).
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本文链接地址：777 AMM 飞机维护手册 液压 Hydraulic Power(3)
