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(M) Technical and Resource Knowledge > Hydraulic System > Flashcards

Hydraulic System Flashcards

1
Q

(B) The Hydraulic System powers what in the aircraft?

A 
1 - Flight Controls 
2 - Landing Gear
3 - Wheel Brakes
4 - Nose Wheel Steering
5 - Spoilers
6 - Thrust Reversers
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2
Q

(B) The normal pressure of each individual system?

A

3,000PSI

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3
Q

(T) What type of hydraulic fluid do we use in our aircraft and why is that important?

A

Skydrol(Type 500) - In-compressible and this type of fluid is fire resistant and less prone to cavitation

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4
Q

(B) How many hydraulic systems does this aircraft have and can they transfer to one another?

A

3 - Independent systems and no

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5
Q

(B) Hydraulic system (1) operates what exactly?

A 
1 - Elevator (Left outboard) 
2 - Rudder (upper actuator)
3 - Thrust Reverser (Engine 1)
4 - Multi-Function Spoilers (Left and Right 3/4)
5 - Ground spoilers (Left and Right 2)
6 - Outboard Brakes 
7 - Emergency Parking Brake
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6
Q

(B) Hydraulic system (2) operates what exactly?

A 
1 - Elevator (Left and Right Inboard)
2 - Ailerons (Right and Left Inboard)
3 - Thrust Reverser (Engine 2)
4 - Multi-Function Spoilers (Left and Right 5)
5 - Ground Spoilers (Left and Right 1)
6 - Inboard Brakes
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7
Q

(B) Components of Hydraulic System (1)?

A

1 - Reservoir
2 - Engine Driven Pump (EDP)
3 - Alternating Current Motor Pump (ACMP)
4 - 2 Accumulators

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8
Q

(B) How does the Reservoir provide positive pressure to the system?

A

A mechanical piston by supplying fluid to the system pumps to prevent pump cavitation

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9
Q

(I) Hydraulic system (1) has how many accumulators and what is their purpose?

A

2 - Hydraulic Accumulators
The accumulators provide storage of pressure, allow thermal expansion, emergency supply of fluid.
It also helps avoid pump cavitation and maintains constant pressure by covering transient demands

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10
Q

(I) At what temperature does the EICAS caution display HYD HI TEMP?

A

100 (C)

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11
Q

(I) At what temperature does the SOV automatically actuate?

A

125 (C) - Which isolates the EDP from the respective hydraulic flow line

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12
Q

(I) What is the maximum temperature of the hydraulic fluid in which the SOV must be closed manually?

A

145 (C)

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13
Q

(B) How many Hydraulic Pumps does this aircraft have?

A

6 - Total
2 - EDP 1 and 2
4 - ACMP 1B/2B/3A/3B

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14
Q

(T) ACMP 1B is powered by which bus?

A

AC BUS 2

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15
Q

(T) ACMP 2B is powered by which bus?

A

AC BUS 1

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16
Q

(T) ACMP 3A is powered by which bus?

A

AC ESS BUS

17
Q

(T) ACMP 3B is powered by which bus

A

AC BUS 2

18
Q

(I) When will ACMP 1 or 2 automatically activate on the ground?

A

1 - Flaps greater than 0
2 - TLA set to T/O
3 - Groundspeed greater than 50 knots

19
Q

(I) When will ACMP 1 or 2 automatically activate in flight?

A

1 - Engine Failure
2 - EDP Failure
3 - Flaps greater than 0

20
Q

(B) What is a PTU?

A

Power Transfer Unit

21
Q

(I) What is the purpose of the PTU?

A

Pumps hydraulic pressure from HYD SYS 1 to power up HYD SYS 2 specifically to retract and extend the landing gear in the event of an engine 2 or EDP failure

22
Q

(I) When will the PTU automatically activate?

A

During Takeoff and Landing with Flaps greater than 0, if Engine 2 or EDP 2 fails

23
Q

(I) Explain the process of single-engine taxi using Engine 1

A

With the hydraulic pumps in the AUTO position, releasing the parking brake activates ACMP 2 in HYD SYS 2 which provides nose-wheel steering and inboard brakes associated with the logic.

24
Q

(I) Explain the process of single-engine taxi using Engine 2

A

HYD 2 provides operation for single-engine taxi, although checklist calls for ACMP 1 in the ON position for outboard brakes

25
Q

(B) What is the primary purpose of HYD SYS 3?

A

Back-up for the flight controls

26
Q

(B) Why are HYD ACMP 3A/B pump switch positions ON and AUTO respectively?

A

HYD ACMP 3A pump is primary and has no automation, meaning its either OFF or ON
HYD ACMP 3B pump is a back-up and automatically activates if ACMP 3A fails or RAT deployment

27
Q

(B) What, if any, HYD ACMP will function if the RAT is the only power source?

A

HYD SYS 3 - ACMP 3A

28
Q

(I) In an electrical emergency what provides hydraulic pressure to flight controls until the RAT comes online?

A

HYD 3 Accumulator

After 8 seconds the RAT will power ACMP 3A

29
Q

(I) In an electrical emergency can HYD 3 system power requirements overload the RAT?

A

No, due to the fact that the flow limiter valve is used to reduce flow and limits pump electrical power draw to prevent a RAT stall

30
Q

(T) When do the ACMP pumps turn off during Takeoff?

A

60 Seconds, when TLA is at TOGA to avoid abrupt hydraulic pressure variations

31
Q

(T) Once the parking brake is SET, how long will the ACMP 2 run for?

A

6 minutes

32
Q

(T) ACMP 1B and ACMP2 turns off when after landing?

A

Below 50 knots after 1 minute

33
Q

(B) Purpose of the HYD SYS 3 accumulator?

A

To provide a back-up pressure to the flight controls when rat is deployed

34
Q

(O) Why do we have 3 independents hydraulic systems?

A

For redundancy and safety, in the event of a hydraulic system malfunction, the other systems are independent and will provide satisfactory system pressure to the essential flight controls.

35
Q

(T) How can the hydraulic temperature exceeds its limits?

A

Failure of a pump compensator

36
Q

(I) HYDRAULIC - EICAS WARNING MESSAGE

A

HYD 1 (2) (3) OVERHEAT

37
Q

(T) What commands the PUV to open? and what does that do?

A

SPDA 2 - Reduces the flow to the ACMP 3

38
Q

(T) When is the FLV energized? and what does that do?

A

RAT deployment - Reduces fluid flow to 1.75 to 2gal/min to allow the RAT to spool up faster and will remain on

(M) Technical and Resource Knowledge (15 decks)

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