hydraulic system Flashcards

1
Q

how many hydraulic systems are on the airplane?

A

3 independent systems
hyd 1, 2 and 3

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2
Q

what systems use hydraulic power

A

flight controls,
spoilers,
landing gear,
nose wheel steering
wheel brakes
thrust reversers

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3
Q

can hydraulic fluid be transferred between each system

A

no

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4
Q

how many hydraulic pumps are on the airplane?

A

7 (if you include PTU)
PTU
engine 1 driven pump
engine 1 electric pump
engine 2 driven pump
engine 2 electric pump
electric pump 3A and 3B

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5
Q

what are the basic components of teh hydraulic system

A

reservoir
pumps
accumulator

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6
Q

what is the purpose of the accumulator?

A

helps to maintain constant pressure by covering transient demands

helps to avoid pump cavitations

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7
Q

what are some important items controlled by the HYD 2 system

A

Landing gear
nose wheel steering
inboard brakes

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7
Q

when will ACMP 1 or 2 automatically activate?

A

ground:
flaps > 0 and
TL set to T/O or
ground speed > 50 kts

in flight:
engine failure or EDP failure
Flaps > 0

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8
Q

what is the PTU

A

power transfer unit
mechanical pump that uses HYD 1 power to provide HYD 2 pressure

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9
Q

what is the primary purpose of the PTU

A

to allow landing gear retraction and extension in the event of an engine 2 or EDP 2 failure

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10
Q

when will the PTU automatically activate?

A

during takeoff and landing with flaps > 0 if

engine 2 fails or
EDP 2 fails

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11
Q

how is single engine taxi possible if nose wheel steering is on HYD 2

A

releasing the parking brake activates ACMP 2

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12
Q

what is the primary purpose of HYD 3 system

A

back up for the flight controls

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13
Q

why does HYD 3A pump have an ON and HYD ACMP 3B have auto?

A

3A is always on - primary, no automation
HYD 3B - back up and automatically activates if ACMP 3A fails

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14
Q

what, if any HYD ACMP will function if the RAT is the only power source?

A

HYD ACMP 3A only

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15
Q

in an electrical emergency, what provides hydraulic pressure to flight controls until the RAT comes online?

A

YD 3 accumulator
After 8 seconds the RAT will power ACMP 3A

16
Q

in an electrical emergency, can HYD 3 system power requirements overload the RAT?

A

no, a flow limiter valve is used to reduce flow and limits pump electrical power draw to prevent a RAT stall

17
Q
A