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A320 > Hydraulics > Flashcards

Hydraulics Flashcards

1
Q

what are the 3 system colours

A

Green, Blue, Yellow

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2
Q

what are the normal operating pressures of each hydraulic system (RAT)

A

3000psi (2500psi on the RAT)

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3
Q

what pumps are used to pressurize the green hydraulic system

A

ENG 1 driven pump

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4
Q

what pumps are used to pressurize the blue hydraulic system

A
  • electric pump

- RAT driven pump

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5
Q

what pumps are used to pressurize the yellow hydraulic system

A
  • ENG 2 driven pump
  • electric pump (when no engine is running)
  • hand pump (when no electrics available in the system for operating the cargo doors)
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6
Q

what 2 systems are integrated into the Power Transfer Uint (PTU)

A

Green and Yellow

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7
Q

when does the PTU operate automatically

A

if diff pressure between the green and yellow systems > 500psi

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8
Q

how is the RAT deployed

A
  • Auto = AC BUS 1+2 fail and speed > 100kt

- Man = MAN RAT Pb pressed on the OVHD panel

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9
Q

what is the purpose of system accumulators

A

helps maintain a constant pressure by covering transient demands during normal operations

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10
Q

what is the purpose of the priority valves

A

cuts off hydraulic power to heavy load users if hydraulic pressure in a system gets low

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11
Q

how are the fire shutoff valves operated

A

ENG FIRE Pb on the OVHD panel

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12
Q

what are the leak measurement valves located in the hydraulic system

A

upstream of the primary flight controls

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13
Q

where are hydraulic filters found in the hydraulic system

A
  • HP filters: each system, reservoir filling system, normal braking system
  • return line filters on each line
  • case drain filters on engine pumps and the blue electric pump
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14
Q

how are the reservoirs pressurized

A
  • HP bleed air from ENG 1

- if bleed air is too low, the system takes bleed air pressure from the XBLEED duct.

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15
Q

what is the purpose of pressurizing the hydraulic reservoirs

A

prevents cavitation of the pumps

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16
Q

what does the green hydraulic system control

A
  • normal brakes
  • rev ENG 1
    Priority Valve:
  • slats and flaps
  • landing gear
  • NWS (YUD only)
17
Q

what does the blue hydraulic system control

A

Priority Valve:

  • slats
  • EMER GEN
18
Q

what does the yellow hydraulic system control

A
  • ALT/parking brake
  • rev ENG 2
  • NWS
    Priority Valve:
  • flaps
19
Q

what does an amber fault light on the ENG 1 (2) PUMP Pb mean

A
  • reservoir level is low
  • reservoir overheats
  • reservoir air pressure is low
  • pump pressure is low (inhibited on the ground , when engine is stopped)
    The light goes out, when the crew selects OFF, except during an overheat (light stays on as long as the overheats lasts)
20
Q

what does an amber fault light on the BLUE ELEC PUMP Pb mean

A
  • reservoir level is low
  • reservoir overheats
  • reservoir air pressure is low
  • pump pressure is low (inhibited on the ground , when engine is stopped)
  • pump overheats
    The light goes out, when the crew selects OFF, except during an overheat (light stays on as long as the overheats lasts)
21
Q

with the BLUE ELEC PUMP Pb in the AUTO position when will it run

A

provided AC power is available and:

  • in flight
  • on the ground: 1 engine is running or the BLUE PUMP OVRD PB on the MAINT PNL is pressed
22
Q

what does an amber fault light on the YELLOW ELEC PUMP Pb sw (springloaded) mean

A
  • reservoir level is low
  • reservoir overheats
  • reservoir air pressure is low
  • pump pressure is low
  • pump overheats
    The light goes out, when the crew selects OFF, except during an overheat (light stays on as long as the overheats lasts)
23
Q

when does the yellow electric pump automatically turn on and what effect does it have on the system

A
  • turns on automatically when a crewman selects the cargo door manual selector valve to OPEN or CLOSE
  • inhibits the operation of other yellow system functions (except ALT BRAKE and ENG 2 REV)
24
Q

when is the PTU inhibited

A

during the 1st engine start

25
Q

when does the PTU conduct a self-test automatically

A

during the 2nd engine start

26
Q

what causes the PTU AUTO Pb to fault

A
  • green or yellow reservoir overheats
  • green or yellow reservoir low air pressure
  • green or yellow reservoir low level
    amber fault light goes out when the crew selects OFF, except during an overheat (light stays on as long as the overheats lasts)
27
Q

what does pressing the RAT MAN ON Pb do

A

Manually extends the RAT

28
Q

what effect does closing the LEAK MEASUREMENT VALVES have on the hydraulic system

A

cuts off hydraulic power to the relevant primary flight controls

29
Q

when does the LOW LEVEL WARNING appear for each system (HYD G/Y/B RSVR LO LVL)

A
  • green = 3.5L
  • yellow = 3.5L
  • blue = 2.4L
30
Q

what are the normal filling values for each hydraulic system

A
  • green = 14.5L (2.6L [2.5 YUD])
  • yellow = 12.5L (2.6L [2.5 YUD])
  • blue = 6.5L (1.6L [1.5 YUD])
31
Q

at what pressure does the HYD G/B/Y RSVR LO AIR PR appear

A

reservoir air pressure =/< 22psi (resets if pressure =/> 25psi)

32
Q

at what temperature does the HYD G/B/Y RSVR OVHT ECAM alert appear

A

if hydraulic fluid temperature =/> 93 (resets if temperature =/< 88)

33
Q

at what pressure does the HYD Y/B ELEC PUMP LO PR alert appear

A

if system pressure =/< 1450psi (resets if pressure =/> 1750psi)
additionally for the yellow system:
- Y ELEC PUMP Pb at ON
- Y ENG PUMP and PTU not available

34
Q

at what pressure does the HYD Y/G ENG 1 (2) PUMPM LO PR alert appear

A

pump outlet pressure =/< 1750psi (resets if pressure =/> 2200psi)

A320 (5 decks)

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