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ATR type Rating > Skyblue CBT hydraulic system > Flashcards

Skyblue CBT hydraulic system Flashcards

1
Q

what are the main components of the hydraulic system?

A
  • pumps
  • accumulators
  • connectors
  • main resevoir
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2
Q

where is the hydraulic access point?

A

aft of the main left landing gear

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3
Q

what does the crossfeed valve allow?

A

one system to pressurise the other systems components

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4
Q

what powers the hydraulic pumps?

A

ACW

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5
Q

what is the pump delivery pressure?

A

3000psi

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6
Q

what powers the blue pump?

A

ACW BUS 1

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7
Q

what powers the green pump?

A

ACW BUS 2

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8
Q

What is the purpose of the Auxiliary DC hydraulic pump?

A

pressurises the blue system components when the aircraft is on the ground with no power

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9
Q

can we crossfeed when the auxiliary pump is being used?

A

no

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10
Q

what output does the aux pump produce?

A

1/3 of the main pump pressure

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11
Q

at what system pressure will the auxiliary fuel pump start running?

A

when blue system pressure drops below 1500psi

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12
Q

what is required for automatic operation of the aux hydraulic pump?

A
  • gear handle down
  • release prop brake
  • one engine running
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13
Q

what does the blue hydraulic system supply?

A
  • NWS
  • Flaps
  • spoilers
  • prop brake
  • parking brake
  • emergency brake
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14
Q

what does the green hydraulic system supply?

A
  • LDG gear
  • normal brakes
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15
Q

what is the total capacity of the hydraulic tank?

A

9.6L

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16
Q

what is the refill line on the hydraulic sight glass signifying?

A

8.5l

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17
Q

what is the normal fill level on the hydraulic resevoir?

A

9.35l

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18
Q

what are the 2 approved hydraulic fluids?

A
  • skydrol ld4
  • HYJET IV
19
Q

what is the capacity of the blue and green hydraulic fluid compartments?

A

4 litres

20
Q

when will we get a LO LVL on the hydraulic power panel and EWD?

A

below 2.5L

crossfeed also automatically closes

21
Q

what are the indicators for a clog?

A

turkey poppers on the aft side of the resevoir

22
Q

what displays when the green pressure drops below 1500psi?

A

single chime

caution

HYD GREEN LO PR

LO PR on green pump button

Green systems on ACW hydraulic page go amber

23
Q

when will an overheat condition of the green system occur?

A

temperature sensed by the green pump return line sensor exceeds 121 degrees

24
Q

what should we do if an OVHT is sensed?

A

turn off the pump, open the crossfeed and wait for the system to cool down

25
Q

what does the check valve downstream of the hydraulic pump do?

A

prevents back flow of the opposite systems hydraulic fluid if crossfeed is being used

26
Q

what the green accumulator do?

A

shock absorber against pressure surges and assists the hydraulic pump when there is high demand

27
Q

what is in the accumulator?

A

0.2L of nitrogen

28
Q

where is the pressure sensor for indication in the green system?

A

downstream of the check valve

29
Q

what is the corrective action for a low pressure on either system?

A

switch off the affected pump and turn on the crossfeed

30
Q

what can be set once we re energise the blue system using the auxiliary pump?

A

park brake can be set

prop brake can be engaged

31
Q

what is the blue aux pump powered by?

A

HOT MAIN BAT BUS

DC BUS 2

32
Q

HOW LONG WILL THE AUX PUMP RUN FOR when the button is pressed?

A

30 seconds

33
Q

when will the aux blue pump run when one engine is running?

A

gear handle down

aux pump push button on panel depressed

blue output pressure below 1500psi

prop brake not engaged

34
Q

how long will the aux pump operate for if the prop brake is engaged?

A

for 15 seconds after brake engagement

35
Q

if the aux pump was triggered by a main pressure drop of below 1500psi, when will it stop running?

A

when main pressure reaches 2100 psi

36
Q

when will LO PR show on aux pump button with associated chime and EWD?

A

OUTPUT PRESSURE BELOW 1500 PSI

37
Q

What do the check valves in the blue sysem prevent?

A

backflow to the main pump line and aux pump line in event of crossfeed from green system

38
Q

when will the crossfeed valve automatically close?

A

when fluid level in either system drops below 2.5 litres

39
Q

what powers the crossfeed valve?

A

DC STBY BUS

40
Q

what happens if power is removed/lost from the crossfeed valve?

A

crossfeed valve automatically closes

41
Q

how many applications of the park brake is stored in the accumulator?

A

6

42
Q

where is park/emergency brake accumulator pressure displayed?

A

left maintenance panel and ACW/hydraulic page

43
Q

what are the hydraulic pump buttons/lights powered by?

A

Green button: DC ESS BUS

Green lights: DC EMER BUS

Blue buttons/lights: DC EMER BUS

ATR type Rating (22 decks)

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