Hydraulics Flashcards
Engine hydraulic pump pressure
3000psi
Electric hydraulic pump pressure
2900psi
Electric pump activated auto pressure
1600psi /56.4%
EICAS hydraulic temp caution
90°
Hydraulic reservoir capacity
6 litres
Brake over temp
420°
How many hydraulic systems? How are they powered?
2 systems each powered by 1 electric and 1 engine driven pump.
When would you get an EICAS caution for hydraulic overheat?
90°
How can you shutoff hydraulics?
Engine fire handle or shutoff switch in hydraulic panel.
Under what conditions does the electric hydraulic pump operate and to what pressure?
On when N2 is below 56.4% or pressure is 1600psi. Deenergises when engine pump can deliver 2100psi. On it’s own electric pump deliver 2900psi
How many hydraulic accumulators? What pressure are they and what are they used for?
2, 3000psi, landing gear and emergency brakes
What are the 3 functions of the hydraulic manifold?
Fluid filtering, overpessure relief, pressure indications.
What does the priority valve do in system 1?
Isolates the landing gear on retraction so hydraulic power to the flight controls is not lost.
0.3gpm when closed, 6.5gpm when open
What are the green, amber and full quantities of hydraulic fluid?
Above 1 litre, 1 litre and below, 6 litres
What is the green indication of hydraulic pressure, and the normal operating range
1,300 - 3,300psi
2,700 to 3,100psi
Where would you find Hydraulic indications?
MFD systems page
Amber EICAS indicaiton?
<1300psi, >3300psi
What happens in the event of a total hydraulic system failure?
Nose landing gear doors will open
Emergency braking only
No spoilers
Is hydraulic temperature shown on the MFD?
Not it is not shown at all
Outboard spoilers are controlled by which system
2
Landing gear is controlled by which system
1
Steering is controlled by which system
1
Outside brakes are controlled by which system
1
Main door is controlled by which system
1
Inboard spoilers are controlled by which system
1
Parking brake and emergency braking is controlled by which system
2
Inboard brakes are controlled by which system
2
Outboard spoilers are controlled by which system?
2
