Hydraulic Power Flashcards
What hydraulic systems are required for normal/non-normal operation of the landing gear
- Normal system 3
2. Non-normal 2
What indication would you get if the brakes had inadequate HYD pressure and at what pressure does that happen
IB/OB BRAKE PRESS caution when pressure is less than 1800 psi
All ways the hydraulic SOVs can be closed
- L/R Fire Push
2. L/R HYD switch lights
How many hydraulic pumps
6 - 4 AC pumps and 2 eng. driven
Arrange HYD systems in terms of size
3,2,1
How is hydraulic fluid cooled
PSM 14-20-1
- 1 & 2 through shared air/fluid heat exchanger
2. System 3 doesn’t get officially have a method of cooling but indirect cooling as the lines pass through fuel tank
If ADG is deployed can you turn off 3B
PSM 14-30-3
No it will be powered no matter what
With respect to the landing gear, what happens if you loose HYD system 2 and 3
Your nose gear won’t come down and mains will only lock mechanically not hydraulic
What happens to braking after SYS 3 failure
- Accumulators hold pressure for 6 activations
- Outboard brakes not effected
- After accumulator depletion only 50% braking
When do 1B and 2B pumps come on in auto
PSM 14-20-3
- Flaps out of 0* with…
- Cross side bus powered
- Any AC generator working, excluding ext. power
When will 1B and 2B operate in the ON position
- Cross side bus powered
2. ANY AC power source
How do the 3A & 3B pumps run
PSM 14-10-1
3A runs continuously 3B runs during periods of high flow, I.e. Flaps out of zero
What does a HYD 1 or 2 OPEN caution mean
PSM 14-20-7
Indicates that the respective shut-off valve is open with an associated fire
When in auto, will the B pumps come on automatically with a loss of hydraulic pressure
No
What color is the brake pressure read outs
Green above 1800
Yellow below 1800
