Hydraulic System Flashcards
What is the normal hydraulic reservoir quantity?
45-85%
The hydraulic quantity readout is only valid when the system is pressurized
True
What hydraulic pumps are not controlled by the Hydraulic Control Panel
1A and 2A
The hydraulic high temperature caution activates at what temperature?
Greater than 96 degrees C.
Where does hydraulic pump 3B receive its power?
From AC Bus 1 or the ADG bus when ADG is deployed.
it is hard wired to the ADG
What problems will be encountered with a HYD 2 LO PRESS message displayed, along with the loss of HYD SYS 3?
Nose gear will not extend during Landing Gear Manual Extension and a side slip may be required to assist/achieve MLG down lock. Nose wheel steering will be inoperative.
How can the Hydraulic shutoff valve be closed to interrupt fluid to the EDP?
- Press the white Hydraulic Shutoff switchlight
2. Press the ENG FIRE switchlight
How is the fluid for system one and two cooled?
By ram air from the ram air scoop passing over the heat exchanger in aft equipment bay. An electric fan provides air during ground ops.
With a B hydraulic pump in the AUTO position, what will cause the pump to operate?
Movement of the flaps from the 0 position.
What is normal system pressure?
3000psi
If the reservoir is outside of the normal range, what color will the digital quantity be displayed in?
White
What kind of hydraulic fluid do we use and what is its color?**
Skydrol purple*****
If pump 1A or 2A fails, will the respective electric pump activate automatically?
no
When will the electric pumps automatically activate?
ACMP’s activate with their respective switches in auto, at least one generator online, and the flap position greater than 0
Is system cooling provided for the hydraulic 3 system and why?
No because it has enough travel distance to self cool
How are HYD 1 and HYD 2 cooled?
ram air in flight or fan in the ram air duct while on the ground blow cooling air over the shared hydraulic heat exchanger in the aft equipment bay
If there is an engine driven pump problem, 1A or 2A, is the associated engine required to be shutdown?
No a shutoff valve has been positioned between the pump and the reservoir to isolate the pump from the system
what is indicated by system being displayed in White vs Amber vs magenta
white means system pressurized over 1800psi
amber means system pressurized below 1800psi
magenta means sensing system is receiving invalid data
How many total hydraulic pumps are there?
SIX 4 electric pumps and two engine driven pumps
How can the engine hydraulic shutoff valves be closed?
by pressing the associated L or R HYD SOV switchlight or by pressing the associated eng fire switch
What purpose does the accumulator serve?
It dampens oscillations in pressure
What is the normal accumulator charge?
1500psi
which system provides power to the brakes?
systems 2 and 3 inboard brakes, and 2 outboard brakes
which system provides power to the nose wheel steering?
system 3
