Hydraulics Flashcards
Can the auxiliary hydraulic pump be used to supply pressure if the right Fire Handle has been pulled?
Yes, it has a separate feed line from the right hydraulic reservoir.
Where is the auxiliary hydraulic pump located?
In the right wheel well.
To what setting do the engine driven pumps default to after a failure?
They electrically fail to the high 3000 psi output.
What drives the engine driven fuel pumps?
N2 rotation.
List the items powered by the left hydraulic system.
Left engine thrust reverse
Inboard spoilers
Elevator boost
List the items powered by the right hydraulic system.
Gear Right thrust reverse Rudder Outboard spoilers Stairs
How can hydraulic fluid supply to the engine driven hydraulic pump be stopped?
By pulling the corresponding engine fire handle.
During normal flight what output do the hydraulic pumps operate at?
Engine driven pumps are operated at 1500 psi, and the alternate hydraulic pump is typically off.
Where is each engine driven hydraulic pump located?
On each engine’s accessory gearbox.
Where is the alternate gear pump located?
In the right wheel well.
What must the alternate gear pump have in order to operate?
Hydraulic fluid on one side of the system and hydraulic pressure on the other.
When will the hydraulic system priority valve open and close?
It will open at 1850 psi and close at 1500 psi.
What is the point of the hydraulic priority valve?
To give the flight controls priority over other systems with pressure available.
When the left hydraulic system drops below ________ psi what systems will not be available?
2000 psi
Wing flap outboard cylinders
Left nose wheel steering
When the right hydraulic system drops below ________ psi what systems will not be available?
2000 psi
Wing flap inboard cylinders
Landing gear
Right nose wheel steering
What is he purpose of the hydraulic relief valve?
To provide blowback relief when the spoiler surfaces are exposed to excessive air loads. (B2 8-192)
When will the hydraulic pressure low light come on?
Approximately 1000 psi.
What position should the depressurization valve be in before flight?
On which indicates pressure is available to the entire system. (System bypass is used for mechanical operations)
Which bus powers the auxiliary hydraulic pump?
The right generator bus.
What systems are backed up by an accumulator? How many accumulators are there for each of these systems?
Brakes (2) Elevator boost (1) Aft stairs (if installed 1) Rudder (0) Reverse (2)
What systems receive pressure from both the left and right hydraulic systems?
Flaps and Slats
Nose wheel steering
Brakes
Ground spoilers
What hydraulic gauges are powered by their respective L/R AC power?
Hydraulic pressure gauge
Hydraulic quantity gauge
Brake pressure gauge
What is the power source for the aux hydraulic pump, and why?
Left AC power, this is in case of an damage on the right side of the aircraft for whatever reason.
