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A320 Knowledge > Hydraulic System DSC 29 > Flashcards

Hydraulic System DSC 29 Flashcards

1
Q

What is the normal hydraulic system pressure for green, blue and yellow systems?

A

3000 psi

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2
Q

What system pressure is the blue system when powered by the RAT?

A

2500psi

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3
Q

How is the Green system pressurised?

A

A pump driven by engine 1

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4
Q

How is the Blue system pressurised?

A
  • An electric pump

- A pump driven by the RAT (in an emergency)

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5
Q

How is the Yellow system pressurised?

A
  • A pump driven by Engine 2
  • An electric pump (for use on ground when engines are stopped)
  • A hand pump to operate cargo doors when electrics are not available
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6
Q

What is the PTU?

A

A bidircectional power transfer unit.

It enables the yellow and green systems to pressurise each other

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7
Q

When will the PTU automatically activate?

A
  • When differential pressure between G + Y >500psi

- during the second engine start, for the automatic test

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8
Q

When is the PTU inhibited?

A

During the first engine start

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9
Q

What is the drop out RAT coupled to?

A

A hydraulic pump

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10
Q

When will the RAT automatically deploy?

A

If AC bus1 and AC bus2 are both lost

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11
Q

Can the RAT be manually deplyed?

A

Yes, from the overhead panel

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12
Q

When can the RAT be stowed?

A

Only on the ground

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13
Q

What do priority valves do?

A 
Cut off hydraulic power to heavy load users if hydraulic pressure in a system gets low
eg
NWS (YUD)
Landing gear
Slats and flaps
Emer gen
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14
Q

What heavy load users does the priority valve in the green system cut off?

A

NWS (YUD)
Landing gear
Slats and flaps

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15
Q

What heavy load users does the priority valve in the Blue system cut off?

A

Emer Gen

Slats

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16
Q

What heavy load users does the priority valve in the Yellow system cut off?

A

Flaps

17
Q

which systems have Fire Shut off valves?

A

Green and Yellow

Upstream of its engine driven pump

18
Q

What is the purpose of the leak measurement valves?

A

Measure hydraulic leakage of each circuit

19
Q

Where are the leak measurement valves located?

A

Each system has 1 LMV upstream of the Primary Flight Controls.

20
Q

How can the Leak Measurement Valves be closed?

A

By operation of the LMV pushbutton on the maintenance panel

21
Q

How are the hydraulic reservoirs normally pressurised?

A

Automatically, by HP bleed air from engine 1

22
Q

If bleed air pressure for the hydraulic reservoirs is too low from where does the system take bleed air pressure?

A

From the crossbleed duct

23
Q

Under what conditions would the HYD ENG pump FAULT light and ECAM appear?

A
  • Reservoir level is Low
  • Reservoir Overheats
  • Reservoir air pressure is Low
  • Pump Pressure is Low
24
Q

When will the Fault light not go out after being selected OFF?

A

During an overheat, while the overheat still exists

25
Q

When will the blue electric pump operate with the pb in AUTO?

A

If AC power is available:
-in flight

  • On the ground,
    • if 1 engine running, or
    • crew has pressed BLUE PUMP OVRD pb on Maint Panel
26
Q

What additional reason would cause the Blue and Yellow electric pump fault lights and ECAM to come on?

A

-Pump overheat

27
Q

When will the yellow hydraulic electric pump come on automatically (pb in OFF position)?

A

When lever of cargo door manual selector valve set to OPEN or CLOSE

28
Q

when the yellow system electric pump is activated automatically, which functions are not inhibited?

A

Alternate braking

Engine 2 reverse

29
Q

When may the RAT MAN ON pb be used?

A

RAT may be extended at any time

30
Q

When is the Hyd System name (ie YELLOW):

a) white?
b) Amber?

A

a) white >1450psi

b) Amber <1450psi

31
Q

When is the ∆ symbol:

a) Green
b) Amber?

A

a) Green >1450psi

b) Amber <1450psi

32
Q

When is the system pressure (ie 3000):

a) Green?
b) Amber?

A

a) Green normally

b) Amber <1450psi

33
Q

When is the hyd system number (ie 1/2):

a) White?
b) Amber?

A

a) white, normally

b) Amber when N2 below idle

34
Q

Are there any Advisories or Resets for Hydraulics?

A

No

A320 Knowledge (40 decks)

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