Type Course > ATA 29 Hydraulics > Flashcards

ATA 29 Hydraulics Flashcards

(101 cards)

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1
Q

Where are the blue and yellow hydraulic electric pump?

A

Blue - Forward of the left MLG bay
Yellow - Forward of the right MLG bay

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2
Q

When does the blue hydraulic electric pump run automatically?

A

When at least one engine is running

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3
Q

When does the PTU automatically operate?

A

If there is a delta pressure of 500 psi between the systems

Assuming it is not inhibited

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4
Q

What does the interlock mechanism of the RAT do, and when does it release?

A

Only permit RAT stowage if the blades are properly aligned and prevents rotation when stowed

Will release at approximately 5° from full extension

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5
Q

What is up lock release of the RAT achieved by?

A

Solenoid

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6
Q

What is down lock release of the RAT achieved by?

A

Hydraulic pressure

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7
Q

Where are the reservoirs for the hydraulic systems?

A

Green - Inside the MLG bay
Blue - Aft of the MLG bay, LH side
Yellow - Inside the yellow hydraulic bay

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8
Q

What do the leak measurement valve switches on the maintenance panel do?

A

Isolate the respective wing/tail flying controls from the hydraulic system

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9
Q

What are utilised to maintain the operation of essential systems should the hydraulic pressure drop?

A

Priority valves which cut off hydraulic power to heavy load users

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10
Q

Which spoilers do the different hydraulic systems control?

A

Green - 1 and 5
Yellow - 2 and 4
Blue - 3

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11
Q

Which hydraulic systems control the ailerons?

A

Green and blue

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12
Q

How is a hydraulic pipe identified?

A
  • Part number
  • Black dots on a white background
  • Yellow and blue field indicating fluid flow
  • Coloured and number sleeve indicating which hydraulic system
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13
Q

What is the arrangement of the seals on a bobbin connected to a hydraulic manifold?

A

Square seal on the component side

O-ring on the manifold side

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14
Q

How can the orientation of a bobbin be ensured?

A

Identification groove on the manifold side

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15
Q

What does the green hydraulic supply?

A
  • Landing gear
  • Slat motor and flap motor
  • Normal brakes
  • Thrust reverser engine 1
  • RH flaps WTB
  • LH & RH slats WTB
  • Rudder & yaw damper actuator 1
  • THS
  • LH & RH ailerons
  • LH elevator
  • Spoilers 1 & 5
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16
Q

What does the yellow hydraulic supply?

A
  • Nose wheel steering
  • Flap motor
  • Alternate & parking brakes
  • Thrust reverser engine 2
  • FWD & AFT cargo doors
  • LH flaps WTB
  • Rudder & yaw damper actuator 2
  • THS
  • RH elevator
  • Spoilers 2 & 4
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17
Q

What does the blue hydraulic supply?

A
  • Emergency generator
  • Slat motor
  • LH & RH flaps WTB
  • LH & RH slats WTB
  • Rudder
  • LH & RH ailerons
  • LH & RH elevators
  • Spoiler 3
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18
Q

Which users of green hydraulic pressure receive fluid from the PTU manifold?

A
  • Normal brakes through the normal brakes servo valve
  • Heavy users via the priority valve
  • PTU
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19
Q

What components are attached to the green hydraulic reservoir?

A
  • Direct reading gauge
  • Quantity indicator
  • Low-level switch for ECAM indicating and warning
  • Low air pressure sensor
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20
Q

What are the three levels of the green hydraulic reservoir?

A

Normal fill level - 14 litres
Maximum gaugeable level - 18 litres
Low level warning - 3 ± 0.4 litres

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21
Q

What are the three levels of the yellow hydraulic reservoir?

A

Normal fill level - 12 litres
Maximum gaugeable level - 18 litres
Low level warning - 3 ± 0.4 litres

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22
Q

What are the three levels of the blue hydraulic reservoir?

A

Normal fill level - 6 litres
Maximum gaugeable level - 8 litres
Low level warning - Between 2 and 2.3 litres

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23
Q

What is the normal pressure, high pressure relief and low pressure switch values of the green, blue and yellow reservoirs?

A

Normal pressure - 50 psi
High pressure relief - 77 psi
Low pressure switch threshold - 22 psi

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24
Q

At what pressure will the case drain filter indicate clogging in the green, blue and yellow hydraulic system?

A

87 ± 8.7 psi

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25
What is the purpose of the engine driven pump blocking valve?
Isolates the pump from the hydraulic system when the pump operates in de-pressurised mode
26
What indications does the SDAC receive about the green hydraulic system?
* Low air pressure * Quantity * Low level * Temperature in the return manifold * Engine driven pump outlet pressure
27
What is the threshold of the green and yellow hydraulic system engine driven pump pressure switch?
1740 psi
28
What is the purpose of the check valve downstream of the engine driven pump in the green and yellow hydraulic systems?
Stops fluid flow to the pump if the system is being pressurised by the PTU
29
Where do the signals from the pressure switches in the HP manifold of the yellow hydraulic system go?
One pressure switch: * ELACs * SEC 1 * ABCU * BSCU * SDACs * FAC 2 Other pressure switch: * ELACs * SEC 2 & 3
30
Where do the signals from the pressure switches in the HP manifold of the green hydraulic system go?
One pressure switch: * ELACs * SEC 1 * BSCU * SDAC * FAC 1 Other pressure switch: * ELACS * SECs 2 & 3
31
What is the threshold of the pressure switches on the HP manifold of the green, blue and yellow hydraulic systems?
1450 psi
32
Where do the signals from the pressure transducer on the HP manifold of the green, blue and yellow hydraulic systems go?
* ECAM (through SDACs) * ELACs
33
When will the HP clogging filter indicate in the green, blue and yellow hydraulic systems?
87 ± 8.7 psi
34
What is the purpose of the accumulator on the HP manifold of the green, blue and yellow hydraulic systems?
* Damper for small changes * Supply of fluid available in case of any demand
35
What is the precharged pressure of the green, blue and yellow hydraulic accumulators and the quantity of fluid they would store?
Pressure - 1885 psi at 20°C Quantity - 1.1 litre
36
At what pressure will the pressure relief valve open and then close in the green, blue and yellow hydraulic systems?
Opens - 3436 psi Closes - 3190 psi
37
When do the green, blue and yellow hydraulic system's priority valves open?
1842 psi
38
What does the temperature sensor assembly on the green, blue and yellow hydraulic system's return manifolds include?
* One temperature switch * Two temperature transducers
39
When does the clogging indicator of the green, blue and yellow hydraulic system's return manifold filters come out?
Differential pressure of 29 ± 4.4 psi
40
When does the bypass of the green, blue and yellow hydraulic system's return manifold filters operate?
58 ± 6.0 psi
41
Where do the temperature indications from the temperature sensor assembly on the green, blue and yellow hydraulic system's return manifolds go?
ECAM warnings and indication on overhead P/Bs
42
How is low N2 speed indicated on the hydraulic ECAM page?
Number 1 next to the pump indication will be amber
43
When will the FAULT light on the ENG 1 PUMP P/BSW stay on, regardless of the position of the switch?
During an overheat
44
When is PTU operation inhibited?
* During cargo door operation * PTU P/B is switched OFF * When the aircraft is on the ground, with one engine running and if the parking brake is set to on or nose wheel steering is disconnected for towing
45
What are the heavy users in the yellow hydraulic system?
* RH flap motor * Nose wheel steering
46
What are the heavy users in the green hydraulic system?
* Landing gear * RH slat motor * LH flap motor
47
What are the heavy users in the blue hydraulic system?
* CSMG * Slat blue motor
48
What is the purpose of the acoustic filter and where is it installed on the blue hydraulic system?
Removes the pulses of pressure of HP flow from the pump Installed at the outlet of the blue electrical pump
49
What is the threshold of the pressure switch at the outlet of the blue electric pump?
1450 psi
50
What is the purpose of the check valve downstream of the blue electric pump?
Prevents fluid flow to the pump if the system is being pressurised by the RAT
51
When does the ECAM receive a temperature indication with regards to the blue hydraulic pump?
Pump body temperature exceeds 165°C
52
What is additionally added to the blue servicing panel which is not on either of the other hydraulic system servicing panels?
Remote drain connection
53
How is the electric circuit protected from the blue or yellow electric pump?
It has a current transformer and phase unbalance detector Current transformer senses a fault, and unbalance detector energises a relay which removes the power from the electric motor Red LED will illuminate on the box
54
Where are the yellow and blue pump phase unbalance detectors?
Right lateral avionics bay
55
Under what conditions will the FAULT light come on the ELECT PUMP P/BSW?
Overheat or low pressure
56
What does the pink label on a loom mean?
Related to the FBW system
57
Where do the signals from the blue hydraulic system HP manifold pressure switches go?
One pressure switch: * ELACS * SEC 1 * SDACs Other pressure switch: * ELACs * SECs 2 & 3
58
Under what conditions will the blue electric pump run automatically?
If * One engine is running, and * Blue pump switch is not off Or * APU is supplying electrical power, and * NLG is not compressed * Blue pump switch is not off Or * Blue pump override switch is operated, and * Blue pump switch is not off
59
When does the RAT deploy automatically using solenoid number 1?
* AC BUS 1 and 2 are 0 volts, and * Aircraft speed is greater than 100 kts
60
How can the RAT be deployed manually?
* Emergency Electrical Power Panel guarded switch is pushed (using solenoid number 2), or * Hydraulic panel guarded switch is pushed (using solenoid number 1)
61
What occurs simultaneously in the yellow hydraulic system where the cargo doors are operated?
* PTU is inhibited * Yellow leak measurement valve is closed * Signal is sent to the SFCC 2 to prevent flaps movement
62
Where is the PTU quick disconnect coupling?
On the yellow HP manifold
63
What are the sources of air for the hydraulic reservoirs?
* Engine 1 HP compressor for normal operation * Pneumatic system in case of loss of engine 1 * Ground supply
64
What is the purpose of the restrictor which runs from engine 1 to the hydraulic reservoirs?
Limits the airflow to 65 psi and cools it to a satisfactory level, and prevents too much bleed air leakage in case of a leak downstream of the restrictor
65
Which component controls the pressurisation of the hydraulic reservoirs?
Reservoir pressurisation unit
66
Explain the operation of the drain valves fitted to the reservoir pressurisation unit?
* Automatic drain valve which will open after each engine or APU shutdown * Manual self-sealing drain valve
67
Where is the reservoir pressurisation unit located?
Blue hydraulic bay
68
What configuration of the aircraft is necessary to check and service the hydraulic fluid correctly?
* Speed brakes and spoilers retracted * Thrust reversers stowed * Cargo doors closed * System accumulators empty of fluid and pressurised with nitrogen to the correct pressure * Accumulators pre-charge pressure checked * Reservoirs pressurised with air * Landing gear down and doors closed (exception can be made for one door giving access to green reservoir) * Brake accumulator may be pressurised with fluid
69
What components are drained into the FWD collector tank (located in the yellow hydraulic compartment)?
* Blue electric pump * Yellow electric pump * Slat Power Control Unit (PCU) * Green hydraulic reservoir * Yellow hydraulic reservoir
70
What components are drained into the AFT collector tank (located in the main hydraulic compartment)?
* Flaps Power Control Unit (PCU) * PTU * CSMG * Blue hydraulic reservoir
71
Which component has a dedicated collector tank?
RAT system
72
What is the capacity of each collector tank?
0.75 litres
73
Why are the hydraulic reservoirs pressurised with air?
To prevent cavitation
74
Where are the fire shut-off valves located?
Between the reservoirs and the EDPs
75
How do the yellow and blue electric pumps compare?
They are interchangeable
76
What pressure can the RAT supply?
2500 psi
77
What components are on the green servicing panel?
* Selector * System contents gauge (G, B, Y) * Green hydraulic reservoir air depressurisation * Ground cart fill connection * Ground cart connections x 2 * Reservoir filling handpump connection * Fill filter (& DPI)
78
Where is the PTU inhibit switch?
Overhead panel (hydraulic)
79
Where are the priority valves located in the green and yellow system?
PTU manifold
80
Where are the sampling valves located?
All HP manifolds
81
What component is used to stop PTU operation within the yellow and green PTU manifold and what is its method of operation?
Solenoid valve Energised closed
82
Under what conditions will a fault light come on the green or yellow pump P/BSW?
* Reservoir level is low * Reservoir overheats * Reservoir air pressure is low * Pump pressure is low (inhibited on the ground when the engine is stopped)
83
Which sensor in the green and yellow system does not go to the Fault light on the pump P/BSW?
System pressure
84
Why is there a time delay relay in the circuit with the blue hydraulic pump?
With the condition of NLG not compressed and APU power available, the time delay relay ensures the pump continues to run for two minutes after touchdown
85
How will a fault with the electric pump be indicated to the crew, considering the phase unbalance detector does not send a fault signal?
Pump will stop and low pressure switch will turn on the fault light
86
Which power supply is used for the yellow and blue electric pumps?
Yellow - AC Bus 2 Blue - AC Bus 1
87
What is the purpose of the stow switch in the RAT system?
Sends a signal to: * ECAM for 'RAT OUT' memo message, and * Be used by the RAT stow panel to indicate a successful 'RAT STOWED' operation
88
How is the outlet pressure of the Reservoir Pressurisation Unit limited to 50 psi?
Pressure reducing valve
89
Why does the RPU need drains?
There is a water separator which prevents fluid entering the reservoirs with the pressurised air, which therefore needs to be drained off
90
What occurs when the low pressure switch in the hydraulic reservoir is activated at < 22 psi?
ECAM LOW AIR PRESS warning
91
On which filter is there no bypass?
Reservoir filling system
92
Where is the restrictor in the hydraulic filling system?
Between the coupler for the ground cart and the reservoir filling selector valve
93
What is the pressure of the back-up supply of pressurised air to the RPU?
43 psi
94
What procedure would you have to complete after: * Maintenance, or * Removal/installation of large hydraulic components, or * Hydraulic fluid low level, or * High loss of hydraulic fluid
Bleeding
95
What is the dispatch limit to avoid delay of a static seal?
2 drops/minute
96
What is the dispatch limit to avoid delay of a static casing?
1 drop/minute
97
What is the dispatch limit to avoid delay of the shaft seal on: * EDP * Electric Motor Pump (EMP) * RAT * PTU
* EDP - 60 drops/minute * EMP - 30 drops/minute * RAT - 1 drop/minute * PTU - 30 drops/minute
98
What checks must be done before the first flight, and which must be done before each flight?
1st flight - Check low level indication Each flight - Check quantity and air pressure
99
What is stowed at the green servicing panel?
Fill pipe
100
What is the indication of a PTU running? a) There is no indication. b) The message HYD PTU is displayed in green on the MEMO display. c) The pressure of the system being supplied by the PTU is displayed amber, even if it is normal.
The message HYD PTU is displayed in green on the MEMO display
101
What happens when the leak measurement valve pushbutton is selected to off? a) There is no indication b) The ON legend on the pushbutton illuminates while an internal leak check is carried out c) The OFF legend on the pushbutton illuminates and the leak measurement valve closes
The OFF legend on the P/BSW illuminates and the leak measurement valve closes
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