In the AUTO position which hydraulic demand pump(s) operate(s) continuously when the airplane is on the ground?
Pilots pressurize the right hydraulic system before the other systems to prevent fluid transfer between systems.
The engine fire switches must be _____ to close the engine–driven pump hydraulic supply shutoff valve and to depressurize the engine–driven pump.
On the STATUS page, what does the hydraulic pressure display?
In what order are the hydraulic pumps switched off after engine shutdown?
The RAT provides hydraulic and electrical power:
How are the Center hydraulic system Primary pumps driven?
With the C1 Demand pump switch at ON, when will the pump run?
How is the hydraulic normal fluid level indicated?
If both air–driven pumps are selected to ON, they can operate simultaneously in very specific conditions.
If both air–driven pumps are selected to ON, only air–driven pump C1 operate: the two air–driven pumps cannot operate simultaneously when both are selected ON.
Advertisement
An hydraulic pump that is on, displays in green with a green flow line. A pump that is off, displays as an open amber box.
A pump that is on, displays in green with a green flow line. A pump that is off, displays as an open white box.
The ______ powers most of the high load components.
It powers the flight controls, the leading edge slats, the trailing edge flaps, the landing gear actuation, the alternate and reserve brakes, The nose gear steering, and the main gear steering.
If center hydraulic system quantity is sensed to be low and _______ , alternate brakes are isolated from the center system and remain operable using reserve fluid, nose gear actuation and steering are isolated and leading edge slats are isolated and not allowed to operate in the primary hydraulic mode.
How are hydraulic reservoirs pressurized?
The engine driven pump on each system is considered the "primary pump", while the electric motor-driven pump is designated as the "demand" pump.
Primary pumps are designed for continuous operation, while demand pumps normally operate only when demand is high or the primary pump has failed.
A hand pump and reservoir quantity gauge allows for servicing all system reservoirs from one location. Left and right system reservoirs center system reservoir, are located in the main gear wheel well area.
A hand pump and reservoir quantity gauge allows for servicing all system reservoirs from one location. Left and right system reservoirs are located in the respective engine strut and center system reservoir is located in main gear wheel well area.
The Center System can be pressurized by:
What does the right hydraulic system power?
In AUTO, when will the center demand pumps operate?
What is the purpose of the Center Hydraulic System Demand pumps?
Advertisement
Both left and right hydraulic systems have a shut-off valve that isolates the engine driven-pump from the reservoir. Which control will close the shut-off valve?
Two electric motor-driven pumps are the Primary hydraulic power sources for the center hydraulic system.
In what order are the hydraulic pumps switched on prior to engine start?
In flight when does the RAT deploy automatically?
What type of hydraulic pumps are used in the Left hydraulic system?
When will a center hydraulic pump "FAULT" light be illuminated?
The below hydraulic status is displayed.
LO displays in amber when the reservoir quantity is low. LO can only display in flight.
What will cause any primary or demand pump FAULT light to illuminate?
Where is the hydraulic system quantity displayed?
An hydraulic pump that has overheated, is displayed on the Hydraulic synoptic with an amber cross.
A pump that has failed, displays with an amber cross. An OVHT display appears next to a pump symbol when the pump is overheated.
Advertisement
A what pressure will the RAT green PRESS light illuminate?
The PRIMARY C1 pump draws hydraulic fluid via a standpipe in the reservoir, while all other center system pumps draw fluid from the bottom of the center system reservoir.
The PRIMARY C1 pump draws hydraulic fluid from the bottom of the center system reservoir, while all other center system pumps draw fluid via a standpipe in the reservoir.
The Primary Pump is driven by the associated engines accessory drive. With a loss of electrical power, this type of pump is designed to turn to the ON condition. Therefore, electrical power is required to turn off a Primary Pump.
If the RAT is unable to maintain _____, the RAT generator electrical load is shed until RPM is satisfactory.
When faced with a choice between hydraulic power to the flight controls or electrical power to the aircraft, the RAT will choose hydraulic power as its priority.
The RAT provides can supply hydraulic and electrical power simultaneously.
When deployed, the RAT provides hydraulic power only to the primary flight control components of the center hydraulic system.
The Flight Control Hydraulic Power switches are installed for:
The RAT can be deployed manually by pushing the RAM AIR TURBINE switch. The RAT is deployed by a compressed spring. The hot battery or APU battery bus must be powered. The center hydraulic system needs to be powered too. Once deployed, the RAT cannot be stowed in flight.
The hot battery or APU battery bus must be powered, but the center hydraulic system does not need to be powered.