A330 Hydraulics Flashcards
How many hydraulic systems does the A330 have? What are they?
- 3
- Green, Blue, Yellow
What is the normal operating pressure of the hydraulic system?
3000 psi (+/-200psi)
When the RAT pressurizes the hydraulic system, how much pressure does it hold?
2500psi
How many hydraulic reservoirs does the A330 have?
- 3
- one for each hydraulic system
How many pumps run each hydraulic system?
- 4 Green, (2 eng driven pumps, 1 elec, 1 RAT)
- 2 Blue, (1 eng (L) driven pump, 1 elec)
- 3 Yellow, (1eng (R) driven pump, 1 elec, 1 hand)
What happens if one engine is failed and the ldg gear is selected up?
The green elec pump runs for 25sec to ensure gear retraction in a proper time.
When the RAT pressurizes the green hydraulic system what happens to the aileron, elevator and spoiler servo controls?
They run at a reduced speed.
When one engine is failed and either the PRIM 1 or PRIM 3 is failed, what does the blue hydraulic system do?
The blue electric pump runs to ensure sufficient pressure on the electrical rudder.
Which hydraulic system is used for ground operations? (cargo doors)
Yellow hydraulic system (elec pump)
When do the yellow electric pumps run automatically?
- In the event of eng 2 failure and flap not at 0 (to ensure flap retraction)
- When the cargo door is operated
At what flow rate do the electric pumps flow?
18% of the engine driven pumps (slow surface retraction)
Which system does the RAT pressurize?
Green hydraulic system
When does the RAT deploy?
- When the RAT MAN ON pb in pressed or
- Dual engine failure (automatically, N3<50%)or
- Low lvl in G/Y or G/B reservoir
At what flow rate does the RAT provide hydraulic pressure?
15-45% of the eng driven pumps.
How many system accumulators are there and what is their purpose?
- 3, one for each hydraulic system (G/B/Y)
- maintain constant pressure in the system
How are the fire shutoff valves closed?
By pressing the FIRE pb on the overhead panel
Can the fire shutoff valves be opened once they have been automatically closed?
No
How are the hydraulic reservoirs pressurized?
- By using HP from engine 1
- Ground air supply
- APU bleed valve
- Cross bleed duct
How are the hydraulic reservoirs pressurized if engine bleed 1 is too low?
By using bleed air from the crossbleed duct.
Why are the hydraulic reservoirs pressurized?
To prevent the pumps from cavitating.
What does HSMU stand for?
Hydraulic System Monitoring Unit
Which hydraulic system does the park brake get it’s pressure from?
Blue (Eng 1)
Which hydraulic system do the cargo doors get their pressure from?
Yellow (Eng 2)
Can the leak measurement valves be closed in flight?
No, the HSMU inhibits this in flight once aircraft speed is above 100kts.
What is the priority valve used for?
It is used to cut hydraulic power to some heavy users (emer gen., NWS, LDG) in order to keep the pressure for normal braking and flight controls when there is a low pressure in the hydraulic system.
When does the fault light come on on the ENG 1(2) PUMP pb?
- Reservoir lvl is low
- Reservoir overheats (light stays on until cool)
- Air pressure in reservoir is low
- Pump pressure is low
When does the fault light come on on the GREEN (YELLOW) ELEC PUMP pb?
- Reservoir low lvl
- Reservoir overheat
- Reservoir air pressure low (light stays on until cool)
- Pump low pressure
- Pump overheat (light stays on until reset on ground)
You’re on the ground and see the YELLOW ‘OFF’ light illuminate on the Leak Measurement Valve panel. What does this mean?
The YELLOW leak measurement valve has automatically closed due cargo door operations to prevent inadvertent movement of the flight control surfaces.
When one of the leak measurement valves is pressed in flight, will the valves close?
What happens if the aircraft lands?
- No, they are automatically prohibited from closing above 100kts.
- Once on the ground (below 100kts) the leak measurement valve will close cutting hydraulic pressure to flight control surfaces.
