Hydraulics Flashcards
What is normal system pressure?
3000 psi
What is the normal reservoir quantity?
45 - 85%
Can hydraulic quantity be accurately read without the system energized?
No
What kind of hydraulic fluid do we use?
Skydrol
What color is skydrol
Purple
If pump 1A or 2A fails, will the respective electric boost pump activate automatically?
No
When will the electric pumps (ACMPs) automatically activate?
- Respective switches to AUTO
- At least 1 generator online
- Flaps out of 0
Is system cooling provided for the hydraulic system 3?
No
How are hydraulic system 1 and 2 cooled?
Ram air in flight
or a fan in the ram air duct while on the ground blow cooling air over the shared hydraulic heat exchanger 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
When will the HYD 1 or 2 HI TEMP caution be displayed?
When the temperature exceeds 96*C
When a powered system is displayed in white on the hydraulic synoptic page, what is indicated?
The system is pressurized above 1800 psi
What is indicated when a system is displayed in amber?
The system is pressurized less than 1800 psi
What is indicated when a system is displayed in muted (dim) magenta?
The sensing system is receiving invalid data
Which pumps are not controlled by the hydraulic control data
Pumps 1A and 2A
How many total hydraulic pumps are there?
6
4 electric
2 engine driven
How can the engine hydraulic shutoff valves be closed?
Pressing L or R HYD SOV switchlight or by pressing the associated engine fire switch
What powers hydraulic pump 3B
Normally AC bus 1, and it is hard wired to the ADG to be powered when the ADG is deployed
If the ADG is providing power to pump 3B, can it be manually turned off?
No, the switch will not work
What effect will a loss of hydraulic system 2 and 3 have on the landing gear?
Manual gear extension is required, and the nose gear will not extend
What purpose does the accumulator serve?
It dampens oscillations in pressure
What is the normal accumulator charge?
1500 psi
Which system provide power to the brakes?
System 2 and 3
3 inboard brakes
2 outboard brakes
Which system provides power to the nose wheel steering
System 3
