HYRDAULICS Flashcards
Regarding the Center Hydraulic System, what pumps provide supplementary hydraulic power for
periods of high system demand or when primary pump pressure is low?
C1 and C2 air demand pumps
The Primary Electric C1 hydraulic pump FAULT light is illuminated and ON is not visible indicates?
The C1 Electric Pump Switch is off.
Both center air demand pumps operate _______.
to meet system demands when selected to AUTO.
With AC power ON and the right electric demand pump switch in the AUTO position on the ground.
pump runs continuously
With their respective switches in the AUTO position, the hydraulic demand pumps operate ____.
when primary pump pressure is low or when high demand is anticipated
When a demand pump FAULT light illuminates, it indicates the following ______.
low demand pump output pressure, excessive demand pump fluid temperature, or the
pump is selected OFF
Which hydraulic pump(s) can load shed?
The primary C2 pump
If a hydraulic system reservoir is filled to beyond the normal full service level, _____ appears on the
Status page and HYD synoptic next to the Hydraulic QTY indication for that reservoir.
OF
The RAM AIR TURBINE PRESS light (overhead panel) indicates the RAT is deployed and the _____ system
(s) flight control hydraulic pressure(s) is(are) normal.
center
The RAT can be deployed manually by using the RAM AIR TURBINE switch _____.
with hot battery bus or APU battery bus powered
Hydraulic pressure for landing gear retraction, extension, and steering is supplied by the _____ hydraulic
system(s).
center
If center hydraulic system quantity is sensed to be low, the system isolates and removes pressure to the
nose gear and steering. The nose gear actuation and steering are reconnected when airspeed decreases
below _____ knots.
60
The center hydraulic system powers _______.
the landing gear actuation and slats/flaps
The center hydraulic system powers _______.
alternate/reserve brake system
In the left and right hydraulic systems, the engine driven pumps receive fluid from the _____.
standpipes
What occurs if the center hydraulic system quantity is sensed to be low and airspeed is greater than 60
knots?
The reserve brakes are isolated from the center system and remain operable
In flight, the RAT deploys automatically if ______.
all three hydraulic systems lose pressure
In flight, the RAT deploys automatically ______.
when all three hydraulic system pressures are low
If electrical loads exceed the power available (airplane or external), ELMS automatically sheds AC loads
by priority. Which of the following may load shed?
C2 hydraulic electric pump
The left hydraulic system powers _______.
some flight controls and the left thrust reverser
The right hydraulic system powers ______.
some flight controls, the right thrust reverser, and normal brakes
Flight control system components are distributed so that ______ can provide adequate airplane control.
any one hydraulic system
The RAT provides hydraulic power to ______.
to the primary flight control components connected to the center hydraulic system
What components does the right hydraulic system power?
Normal brake system
The left and right hydraulic demand pumps are driven by ______.
electric motors
The FLT CONTROL HYD VALVE POWER switches on the Overhead Maintenance Panel are used only____.
on the ground by Maintenance
What does the RAT UNLKD light indicate?
The RAT is not in the stowed position
If deployed, can the RAT be re-stowed in flight?
No
One of the conditions that will automatically deploy the RAT in flight is the _____.
failure of both engines and center hydraulic system pressure is low
An RF indication next to the hydraulic quantity indicates that ______.
the reservoir requires filling
Hydraulic fluid is supplied to each hydraulic system from the respective reservoir. The reservoirs are
pressurized by _____.
bleed air
