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COAS 2022 > 29 Hydraulic > Flashcards

29 Hydraulic Flashcards

1
Q

Which systems have an accumulator?

A

All three!

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2
Q

What is the hydraulic system pressure normally? (and when supplied by the RAT?)

A

3000psi +/- 50psi
(2500psi if supplied by RAT)

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3
Q

When does the PTU kick in?

A

With a difference of 500psi between Green/Yellow system

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4
Q

What are priority valves used for in the hydraulic system?

A

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

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5
Q

Which are the heavy load users that the priority system can isolate?

A

Green: Landing Gear, Slats + Flaps
Blue: Emer Gen, Slats
Yellow: Flaps

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6
Q

Which hydraulic system has a hand pump and why?

A

Only the yellow, for the cargo door

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7
Q

On the HYD SD page, what does the circle represent towards the bottom of the Green and Yellow systems?

A

The hydraulic fire shut off valve (controlled through FIRE PB)

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8
Q

What do the squares on the HYD SD page system lines represent?

A

Engine 1 + 2 (G + Y) engine driven hydraulic pumps, and the blue electric pump

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9
Q

Which systems use green hydraulic pressure to operate?

A

Landing Gear
Slats and Flaps

Rev Eng 1
Normal Brakes

Yaw Damper 1
Rudder
Stabiliser
L Elevator
L + R Spoiler 1 + 5
L + R Aileron
L + R Slat WTB
R Flap WTB

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10
Q

Which systems use yellow hydraulic pressure to operate?

A

Flaps

Nose Wheel Steering
Alternate/Parking Brake
Rev Eng 2
Yaw Damper 2
Rudder
Stabiliser
R Elevator
L + R Spoiler 2 + 4
L Flap WTB

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11
Q

Which systems use blue hydraulic pressure to operate?

A

Emer Gen
Slats

Rudder
L + R Flaps WTB
L + R Slats WTB
L + R Elevator
L + R Spoiler 3
L + R Aileron

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12
Q

Can systems be recovered in a green and yellow hydraulic system failure? How?

A

Engine driven pump fail? Possibly use yellow electric pump
Low reservoir air pressure? System recoverable at lower altitudes
Reservoir overheat? Useable for approach once cooled

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13
Q

What are the key considerations for a green and yellow hydraulic system failure?

A

Stopping problem (landing distances almost triple)
Alternate law (direct law at gear down)
Gravity gear extension QRH
Flaps/slats locked QRH
Some systems may be recoverable

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14
Q

Can systems be recovered in a blue and yellow hydraulic system failure? How?

A

Engine driven pump fail? Yellow electric pump or RAT for blue system
Low reservoir air pressure? System recoverable at lower altitudes
Reservoir overheat? Useable for approach once cooled

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15
Q

What are the key considerations for a blue and yellow hydraulic system failure?

A

Normal law (but without autopilots)
Gravity gear extension QRH (to protect green)
Nose wheel steering is lost

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16
Q

Can systems be recovered in a green and blue hydraulic system failure? How?

A

Blue electrical pump fail? RAT out
Low reservoir air pressure? System recoverable at lower altitudes
Reservoir overheat? Useable for approach once cooled

17
Q

What are the key considerations for a green and blue hydraulic system failure?

A

Handling problem (gear at 200kts)
Aircraft sluggish
Gravity gear extension QRH (at 200kts)
Flaps/slats locked QRH

18
Q

What should you turn off if you have a G hydraulic low level or low air pressure?

A

The PTU to prevent it overheating or damaging the other system, and the green engine 1 pump

19
Q

What should you turn off if you have a Y hydraulic low level or low air pressure?

A

The PTU to prevent it overheating or damaging the other system, the yellow engine 2 pump, and the yellow electric pump

20
Q

Typical hydraulic pressures? (With RAT operating?)

A

3000psi +/- 200psi (2500psi)

21
Q

How does hydraulic system generate pressure?

A

Green- engine 1 driven pump
Yellow- engine 2 driven pump (or electric pump/hand pump)
Blue- Electric pump (or RAT)

PTU can pressurise green or yellow system in event of failure of engine pump

22
Q

What is the hydraulic accumulator and which system supplies it?

A

Accumulator is a way of storing hydraulic pressure when there is no other pressure available (parking brake)

Powered by yellow

23
Q

How are reservoirs pressurised?

A

Bleed air from engine 1.

If engine 1 failed, uses crossbleed air from engine 2.

Prevents cavitation

24
Q

Which systems have fire shut off valves?

A

Yellow and green

25
Q

How does PTU function during engine start procedure?

A

PTU inhibited during first engine start, self tests during 2nd engine start

26
Q

When does PTU operate?

A

Operates when differential pressure of more than 500psi between yellow and green.

Inhibited during 1st engine start and for 40s after cargo door ops

COAS 2022 (28 decks)

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