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Airbus > Hydraulics & Landing Gear > Flashcards

Hydraulics & Landing Gear Flashcards

1
Q

What is normal system operating pressure?

A

3000 psi

2500 psi when powered by the RAT

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2
Q

What pressurises the green system?

A

A pump driven by engine 1

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3
Q

What pressurises the yellow system?

A
  • pump driven by engine 2
  • can also be pressurised by an electric pump which allows yellow hydraulics to be used on the ground with no engine
  • hand pump for the cargo doors when no electrical power is available
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4
Q

What pressurises the blue system

A
  • electric pump
  • pump driven by the RAT in an emergency
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5
Q

How does the PTU work?

A
  • enables the yellow system to pressurise the green and vice versa
  • works when differential pressure is greater than 500 psi
  • therefore allows green system to be pressurised on the ground
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6
Q

How is the fire shut off valves closed?

A

Crew will press the ENG 1(2) FIRE pb

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7
Q

How are the reservoirs pressurised?

A
  • HP bleed air from engine 1 automatically
  • If bleed air pressure is too low it will be taken from the crossfeed duct
  • systems maintain a high enough pressure to prevent their pumps from cavitating
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8
Q

When will a FAULT light come on the ENG 1(2) pump pb?

A
  • reservoir level too low
  • reservoir overheats
  • reservoir air pressure is low
  • pump pressure is low (inhibited on the ground)
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9
Q

When does the blue elec pump work in AUTO?

A

Operates after first engine start

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10
Q

When will you get a FAULT light on the PTU pb?

A
  • green or yellow reservoir overheats
  • green or yellow reservoir has low pressure
  • green or yellow reservoir has low fluid level
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11
Q

What does the BLUE PUMP OVRD pb do on the maintenance panel?

A

You can put the blue elec pump on and use blue system on the ground

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12
Q

How is the landing gear controlled?

A

electrically controlled, hydraulically operated

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13
Q

What controls the landing gear extension and retraction?

A

2 Landing Gear Control and Interface Units (LGCIUs)

Can be extended by a hand crank on the centre pedestal if hydraulics or electrics are lost

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14
Q

Which hydraulic systems is connected to the landing gear?

A

Green

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15
Q

What is the speed limit for landing gear operation?

A

260 kt

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16
Q

What supplies the landing gear indicator panel?

A

LGCIU 1

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17
Q

What supplies the ECAM wheel page?

A

LGCIU 1 - left triangle
LGCIU 2 - right triangle

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18
Q

What happens when you operate the landing gear handcrank?

A
  • handle turned clockwise for three turns
  • system is isolated from the green hydraulics - cut off valve shuts off pressure
  • unlocks landing gear doors and main and nose gear
  • allows gravity to drop gear
  • gear doors remain open
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19
Q

What happens if one LGCIU fails?

A

The other one takes over

In normal ops they swap after each cycle

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20
Q

What does the red arrow mean on the landing gear lever?

A

If the landing gear is not locked down when the aircraft is in landing config, red warning appears on ECAM

21
Q

What system supplies the nose wheel steering?

A

Yellow

22
Q

What is the BSCU?

A

Brake and Steering Control Unit - two onboard

Controls normal braking and anti-skid

A changeover between the channels occurs at each DOWN landing gear lever selection or in case one channel fails

23
Q

When does the steering system receive hydraulic pressure?

A
  • A/SKID and N/W STRG are on
  • towing control lever is in a normal position
  • at least one engine running
  • aircraft is on the ground
24
Q

How far can the handle turn the nosewheel?

A

75 degrees in either direction

25
Q

How far can the ground crew turn the nosewheel?

A

95 degrees in either direction

lever on the towing electrical box on the nose landing gear enables ground crew to deactivate steering system for towing

26
Q

What are the four modes of braking?

A

1) normal
2) alternate braking with anti-skid
3) alternate braking without anti-skid
4) Parking brake

27
Q

What controls braking in alternate braking with anti-skid?

A

Braking is controlled by the Alternate Braking Control Unit (ABCU) and anti-skid is controlled by the BSCU

(for example can occur with loss of green system but BSCU still working)

28
Q

What controls the anti-skid?

A

The BSCU - you only have anti-skid if this operative

29
Q

What protects against tire burst?

A

The main gear wheels are fitted with fusible plugs which protect against tire burst in the event of an overheat

30
Q

What is the alternate braking limit?

A

1000 psi

To prevent wheel locking and limit the risk of tire burst

31
Q

How many brake applications can the accumulator supply?

A

7

32
Q

At what speed does the anti-skid deactivate?

A

below 20 kt

33
Q

What are the conditions for arming the auto brake system?

A
  • green pressure available
  • anti-skid electrically powered
  • no failure in the braking system
  • at least one ADIRU available
34
Q

When will the autobrake activate?

A
  • For LO and MED, when the command for ground spoilers extension is detected
  • For MAX, when command for ground spoilers is detected and wheel speed is above 40 kt
  • will not get auto brake below 72 kt because the ground spoilers will not extend
  • at least two SECs must be operative
35
Q

When is normal braking operative?

A
  • green hydraulics are available
  • A/SKID and N/W STRG switch is on
36
Q

When is alternate braking with anti-skid operative?

A
  • autobrake is inoperative
  • green hydraulics is insufficient
  • yellow hydraulics are available
  • A/SKID and N/W STRG on
  • parking brake not on
37
Q

When is alternate braking without anti-skid operative?

A
  • autobrake and anti-skid are inoperative
  • antiskid system deactivated either electrically (n/w strg switch off, power supply failyre, BSCU failure) or hydraulically (g+y system low preesure, brakes supplied by accumulator only)
38
Q

How does the parking brake work?

A
  • brakes are supplied by yellow hydraulics or by accumulator pressure via parking brake control valve
  • accumulator maintain parking pressure for at least 12 hours
39
Q

When does the brake pressure indicator work?

A

Brake pressure only indicated when the yellow hydraulics are controlling the brake pressure

(alternate braking system activated or parking brake is applied)

40
Q

What is the max brake temperature for take off?

A

300 degrees

41
Q

What system supplies reversers eng 1?

A

Green

42
Q

What system supplies both slats and flaps?

A

Green

43
Q

Which system supplies reversers eng 2?

A

Yellow

44
Q

Which system supplies flaps?

A

Yellow

45
Q

Which systems supplies slats?

A

Blue

46
Q

Which system supplies normal brakes?

A

Green

47
Q

Which system supplies NWS?

A

Yellow

48
Q

Which system supplies alt/park brake?

A

Yellow

Airbus (14 decks)

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