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AG Tech > DSC Hydraulic > Flashcards

DSC Hydraulic Flashcards

1
Q

What is the normal pressure of the HYD system ?

A

3000PSI
2500PSI if powered by RAT

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2
Q

What system can pressurizes the Yellow HYD system ?

A

ENG 2 pump
Can be ELECT Pump or hand pump

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3
Q

What system can pressurizes the Blue HYD system ?

A

Elect pump
And RAT in an emergency

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4
Q

Can any fluid be transferred with the PTU ? And when will it automatically start ?

A

No
Diff pressure of 500PSI

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5
Q

When will the RAT automatically deploy ?

A

when AC BUS 1 & 2 are lost

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6
Q

What system pressurises the HYD reservoirs

A

HP bleed from ENG 1, if too low can use the pressure from crossbleed duct
It’s avoid cavitation

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7
Q

What are the main systems powered by the green HYD ?

A

Landing gear
Flaps/slats
Reverser 1
Normal brakes
flight controls

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8
Q

What are the main systems powered by the Blue HYD ?

A

Emer gen
Slats
flight controls

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9
Q

What are the main systems powered by the Yellow HYD ?

A

Flaps
Alternate braking
Parking brake
NWS
Flight controls
Reverser 2
Cargo door

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10
Q

What are the main operational consequences of loosing Green HYD ?

A

-No landing gear retract => Gravity extension
-Loss of autobrakes and normal brakes
-landing distance due to 2 spoilers lost and 1 rev

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11
Q

What are the main operational consequences of loosing Blue HYD ?

A
  • Loss of emer gen if loss of fluid
  • loss of redundancy
  • slightly longer landing distance
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12
Q

What are the main operational consequences of loosing Yellow HYD ?

A
  • can’t vacate due to no NWS
  • landing distance due to 2 spoilers and Rev 2 lost
  • loss of alternate braking => Check pressure on stand for park brake
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13
Q

For a dual HYD failure, how would you describe by few words the main consequences of loss of B+Y, G+B, G+Y ?

A

B+Y => Least detrimental
G+B => controllability
G+Y => Stopping

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14
Q

What are the main operational consequences of dual HYD failure B+Y ?

A
  • Normal law but no AP
  • no NWS
  • increased landing distance
  • Landing gear gravity extension to protect remaining system
  • no Speed brakes
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15
Q

What are the commun consequences of any dual HYD failure ?

A
  • CAT 1 landing capability due to AP1&2 Lost
  • Landing gear by gravity so no gear retract
  • increase landing distance
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16
Q

What are the main operational consequences of dual HYD failure G+Y ?

A
  • Alternate law so direct law landing
  • landing distance massively increased due to loss of 4 spoilers, Rev 1&2, antiskid
  • No flaps so use of QRH flaps/slats jammed
  • No THS
  • no NWS
  • For landing Gear gravity extension
    For landing => All the way to config 3 THEN gear down to maintain some auto trim as long as possible
17
Q

In dual HYD failure G+Y, how should you configure the A/C for landing and why ?

A

Use flaps slat jammed QRH
Configure up to Flaps 3 then gear down.
Allow to maintain some auto trim with the elevator and provide sufficient elevator control for the flare.

18
Q

What are the main operational consequences of dual HYD failure G+B ?

A
  • Alternate law so direct law landing
  • Controllability issue due to loss of ailerons => Roll only with 2 spoilers and only one elevator
  • loss of slats => So QRH flaps/slats jammed
  • for landing gear gravity extension
  • For better controllability => at 200kt gear down => Better elevator response in direct law
19
Q

Why in flight does the G reservoir level always show slight less than the other 2 ?

A

After gear retraction some fluid is still in the system and not back in the reservoir

20
Q

What is the purpose of priority valves ?

A

Disconnect heavy load user if HYD pressure gets low.

21
Q

What is the purpose of the accumulator ?

A

help maintain constant pressure by covering transient demands

22
Q

When does the HYD system PR becomes amber ?

A

pressure of less than 1450PSI

23
Q

On G+B SYS fault why do you extent the LDG gear at 200kt ?

A

Better pitch control in direct law

24
Q

On G+Y SYS fault, why do you select Flap 3 before gear down ?

A

once gear is extended you loose the autotrim via the elevators + it provide sufficient elevator control to flare A/C on landing

25
Q

What HYD service power the ailerons

A

G+B

26
Q

What are the key components of the Green HYD

A 
Landing gear
Flaps
Slats
Rev 1
Normal brake
Flight Controls
27
Q

What are the key components of the Blue HYD

A

Emer Gen
Slats
Flight control

28
Q

What are the key components of the Yellow HYD

A 
Flaps
NWS
Rev 2
Alternate braking
Flight control

Cargo door

AG Tech (9 decks)

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