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787 > CH13 HYDRAULICS > Flashcards

CH13 HYDRAULICS Flashcards

1
Q

What does the RAM AIR TURBINE Switch do?

A

Push - deploys the RAT

RAT stands for Ram Air Turbine, which is used to provide emergency hydraulic power.

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2
Q

What does the Ram Air Turbine Pressure (PRESS) Light indicate when illuminated (white)?

A

The RAT is deployed and center system primary flight control hydraulic pressure is greater than 3000 psi

This indicates that the hydraulic system is functioning properly at a high pressure.

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3
Q

What does the Ram Air Turbine Unlocked (UNLKD) Light indicate when illuminated (amber)?

A

The RAT is not in the stowed position

This is a warning that the turbine could be deployed when it should be stowed.

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4
Q

What happens when the Left/Right Engine (L/R ENG) PRIMARY Pump Switches are ON?

A

The engine-driven hydraulic pump pressurizes the related left or right hydraulic system when engine starts

This is crucial for hydraulic system operation during engine start.

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5
Q

What does it mean if the Fault light on the Left/Right Engine PRIMARY Pump Switch is illuminated (amber)?

A

Low primary pump pressure, excessive primary pump fluid temperature, or pump selected OFF

Indicates issues with the hydraulic pump that require immediate attention.

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6
Q

What are the three settings for C1/C2 Electrical Pump Selectors?

A
  • ON
  • AUTO
  • OFF

These settings control the operation of the electrical pumps in the hydraulic system.

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7
Q

What does the C1/C2 Electrical Pump Selector set to AUTO do?

A

Pumps alternate as a primary pump and a demand pump

The primary pump operates continuously and the demand pump operates during high system demand.

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8
Q

What does it mean if the C1 and C2 Pump FAULT Lights are illuminated (amber)?

A

Low primary pump pressure

This indicates a problem with the hydraulic pump that could affect system performance.

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9
Q

Fill in the blank: The Ram Air Turbine provides _______ hydraulic power.

A

[emergency]

The RAT is essential for maintaining hydraulic pressure during system failures.

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10
Q

True or False: The C1 Electrical Pump will run continuously if set to ON.

A

True

This ensures a consistent hydraulic supply from the C1 pump.

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11
Q

What does the illuminated amber light on the C1 and C2 Pump FAULT indicate?

A

It indicates either low primary pump pressure, excessive primary pump fluid temperature, or that the pump is selected OFF.

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12
Q

What are the three positions of the Demand (L/R ELEC DEMAND) Pump Selectors?

A
  • ON - the pump runs continuously
  • AUTO - the pump operates under low pressure conditions
  • OFF - the pump is off
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13
Q

What does the illuminated amber light on the Demand Pump FAULT indicate?

A

It indicates low demand pump pressure, excessive demand pump fluid temperature, or that the demand pump is selected OFF.

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14
Q

How can hydraulic system indications be displayed?

A

By pushing the systems (SYS) display switch and selecting either the status (STAT) synoptic key or the hydraulic (HYD) synoptic key.

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15
Q

Fill in the blank: The hydraulic system indications are displayed by pushing the systems (SYS) display switch, then selecting either the _______ synoptic key or the _______ synoptic key.

A

[status, hydraulic]

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16
Q

What does the Status Display show in the hydraulic system indications?

A

It shows various metrics including QTY, PRESS, and RF values.

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17
Q

True or False: The AUTO position of the Demand Pump Selectors allows the pump to run continuously.

A

False

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18
Q

What is the significance of the hydraulic panel in the B787?

A

It provides critical information on pump status and system performance.

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19
Q

What is the maximum pressure indicated for the hydraulic system in the given display?

A

4650

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20
Q

What is the minimum pressure indicated for the hydraulic system in the given display?

A

4850

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21
Q

What does the hydraulic system quantity display indicate?

A

Displays system reservoir quantity as a percentage of the normal service level (1.00 is the normal service level)

It provides critical information about the hydraulic fluid level in the system.

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22
Q

What does ‘LO’ indicate in the hydraulic system display?

A

Displayed when the reservoir quantity is low

This alert is shown in amber color.

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23
Q

What does ‘OF’ indicate in the hydraulic system display?

A

Displayed when the reservoir is over-full (inhibited in flight)

This alert is shown in white color.

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24
Q

What does ‘RF’ indicate in the hydraulic system display?

A

Displayed when the reservoir requires refilling (inhibited in flight)

This alert is shown in white color.

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25
Q

What does the pressure display show in the hydraulic system?

A

Displays hydraulic system pressure in pounds per square inch

This is critical for monitoring system performance.

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26
Q

What is the normal service level for hydraulic reservoir quantity?

A

1.00

This level indicates optimal fluid quantity for system operation.

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27
Q

Fill in the blank: The hydraulic system indications display includes _______ status.

A

[Hydraulic Display]

This includes quantity and pressure indicators.

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28
Q

What components are included in the hydraulic synoptic display?

A
  • L REV
  • R REV
  • FLT CTRL
  • FLAPS
  • NOSE GEAR & STEERING
  • MAIN GEAR
  • RAT
  • OVHT
  • L ENG
  • R ENG
  • L ELEC
  • R ELEC

These components provide a comprehensive overview of the hydraulic system’s operational status.

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29
Q

What does the green indication for EMP signify?

A

Pump output pressure exceeds 2000 psi

EMP stands for Engine Mounted Pump.

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30
Q

What does the white indication for EMP mean?

A

Pump output pressure less than or equal to 2000 psi and pump is commanded off

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31
Q

What does the amber indication for EMP indicate?

A

Pump output pressure less than or equal to 2000 psi when commanded on

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32
Q

What does the white, low intensity indication for EMP signify?

A

Signal(s) from pump are invalid or missing

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33
Q

What pressure level indicates that the Engine Driven Pump (EDP) is on?

A

2150 psi or greater

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34
Q

What does the white indication for EDP signify?

A

Pump output pressure less than 2150 psi and pump is commanded off

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35
Q

What is the purpose of the B787 QRH?

A

To provide operational guidance for system descriptions and indications

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36
Q

What are the two types of indications for hydraulic systems mentioned?

A
  • EMP indications
  • EDP indications
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37
Q

Fill in the blank: The symbol for EMP on indicates that the pump output pressure exceeds _______.

A

2000 psi

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38
Q

True or False: The EDP is indicated as off when the pump output pressure is less than 2150 psi.

A

True

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39
Q

What does EDP indicate when it is failed?

A

EDP failed (amber)

Indicates an issue with the Electric Driven Pump.

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40
Q

What is the pump output pressure threshold for the hydraulic system?

A

Less than 2150 psi

This indicates a potential issue if the engine primary pump switch is ON and engine is running.

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41
Q

What does a white, low intensity EDP indication signify?

A

EDP invalid

This means that signals from the pump are invalid or missing.

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42
Q

What does a green symbol indicate for Shutoff Valves (SOV)?

A

Valve open

Indicates that the engine fire handle is not pulled.

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43
Q

What does a white symbol indicate for Shutoff Valves (SOV)?

A

Valve closed

Indicates that the engine fire handle has been pulled.

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44
Q

What does an amber symbol indicate for Shutoff Valves (SOV) when failed closed?

A

Valve failed closed

This indicates a malfunction in the valve.

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45
Q

What does an amber symbol indicate for Shutoff Valves (SOV) when failed open?

A

Valve failed open

This indicates that the valve is not functioning correctly.

46
Q

What is the significance of the 5G 59% indication?

A

Indicates G-force and system status

Used for monitoring aircraft performance.

47
Q

What does the term ‘Synoptic Indication Symbology’ refer to?

A

Visual representation of system indicators

Helps in understanding the status of hydraulic systems.

48
Q

Fill in the blank: The pump output pressure is less than _______ psi when indicating a potential issue.

49
Q

What does a green symbol indicate in the hydraulic system indications?

A

Valve open

This indicates that the valve is functioning normally and is in the open position.

50
Q

What does a white symbol indicate in the hydraulic system indications?

A

Valve closed

This indicates that the valve is functioning normally and is in the closed position.

51
Q

What does an amber symbol indicate when it shows ‘Valve failed open’?

A

Valve open when commanded closed

This indicates a malfunction where the valve remains open despite a command to close it.

52
Q

What does an amber symbol indicate when it shows ‘Valve failed closed’?

A

Valve closed when commanded open

This indicates a malfunction where the valve remains closed despite a command to open it.

53
Q

What does a white, low intensity symbol indicate regarding the valve status?

A

Signal(s) from valve are invalid or missing

This indicates a communication issue with the valve, suggesting that its operational status cannot be determined.

54
Q

In the hydraulic system indications, what is the significance of the ‘Isolation Valve (ISLN)’?

A

Synoptic Indications

This refers to the visual representation of the isolation valve’s status in the hydraulic system.

55
Q

What is the purpose of the B787 FCOM?

A

Flight Crew Operating Manual

It provides guidelines and procedures for the operation of the Boeing 787 aircraft.

56
Q

What does the ‘B787 QRH’ stand for?

A

Quick Reference Handbook

This handbook provides critical emergency procedures and checklists for the Boeing 787.

57
Q

What does ‘FAM’ refer to in the context of the B787?

A

Flight Attendant Manual

This manual outlines the responsibilities and procedures for flight attendants on the Boeing 787.

58
Q

What is the significance of the ‘B787 FCTM’?

A

Flight Crew Training Manual

This manual assists in training flight crew members on the operational procedures for the Boeing 787.

59
Q

What does the acronym OVHT stand for?

A

Pump overheat

60
Q

What does a load shed indication signify in the hydraulic system?

A

Pump has received load shed command

61
Q

What color and symbol indicate normal system pressure in the hydraulic system?

A

White with 3000 psi or greater

62
Q

What color indicates low system pressure in the hydraulic system?

63
Q

What does low quantity (amber LO) indicate in the hydraulic reservoir?

A

Hydraulic reservoir quantity is low

64
Q

What does the refill quantity (white RF) indication mean?

A

Hydraulic reservoir requires refilling. Inhibited in flight

65
Q

What does the overfill (white OF) indication mean?

A

Hydraulic reservoir is overfilled. Inhibited in flight

66
Q

What do the green flow lines with directional arrows represent?

A

Pump is on and no valves upstream or downstream are closed

67
Q

What do narrow white lines represent in the hydraulic system indications?

A

Unpressurized flow lines

68
Q

What is the system pressure threshold for low system pressure?

A

Less than 3000 psi

69
Q

What is the system pressure threshold for normal system pressure?

A

3000 psi or greater

70
Q

What is the indication for pump temperature exceeding limit?

A

Pump overheat (OVHT)

71
Q

Fill in the blank: The hydraulic reservoir requires refilling when it shows _______.

72
Q

True or False: The hydraulic reservoir overfilled indication is shown in amber.

73
Q

What does the term ‘Flow lines’ refer to in the hydraulic system?

A

Green with arrow end or white solid lines indicating flow

74
Q

What is the function of the Engine Fire Switches?

A

Closes the engine driven pump hydraulic supply shutoff valve and depressurizes the engine driven pump

Engine Fire Switches are critical for shutting down fuel supply in case of an engine fire.

75
Q

What is the purpose of the Flight Control Surface Lockout Switches?

A

For ground maintenance use only

No flight crew normal or non-normal procedures require operation of these switches.

76
Q

What does the position ‘NORM’ indicate on the Flight Control Surfaces Lockout Switches?

A

Associated flight control surface electronically unlocked

This allows normal operation of the flight control surfaces.

77
Q

What does the position ‘LOCK’ indicate on the Flight Control Surfaces Lockout Switches?

A

Associated flight control surface electronically locked

This prevents operation of the flight control surfaces.

78
Q

Which components are included in the Flight Control Surfaces?

A

Tail and Wings

These are essential for aircraft maneuverability and stability.

79
Q

True or False: The Flight Control Surface Lockout Switches are required for normal flight operations.

A

False

They are intended for maintenance purposes only.

80
Q

How many independent hydraulic systems does the airplane have?

A

Three independent 5000 psi hydraulic systems

81
Q

What are the three hydraulic systems named?

A

Left, right, and center

82
Q

What components are powered by the hydraulic systems?

A
  • Flight controls
  • Landing gear
  • Thrust reversers
  • Trailing edge flaps
  • Leading edge slats
  • Nose gear steering
83
Q

What is the function of the hydraulic system components distribution?

A

To provide adequate airplane controllability

84
Q

How is hydraulic fluid supplied to each hydraulic pump?

A

From the associated system reservoir

85
Q

What pressurizes the hydraulic system reservoirs?

A

Pump outlet pressure

86
Q

What components does the left hydraulic system power?

A
  • Flight controls
  • Left engine thrust reverser
  • Right and left wing spoilers
87
Q

What components does the right hydraulic system power?

A
  • Flight controls
  • Right engine thrust reverser
  • Right and left wing spoilers
88
Q

True or False: The left and right hydraulic systems are identical.

89
Q

Fill in the blank: The illuminated (amber) light indicates that the system _______ has failed.

90
Q

What is the pressure rating of the hydraulic systems?

91
Q

What drives the left and right hydraulic system primary pumps?

A

The left and right hydraulic system primary pumps are engine driven by the related left and right engines.

92
Q

What type of pumps are the left and right hydraulic system demand pumps?

A

Electric motor-driven pumps (EMPs).

93
Q

What is the primary function of the demand pumps in the hydraulic system?

A

Provide supplementary hydraulic power for periods of high system demand and a backup hydraulic power source for the engine driven primary pumps.

94
Q

What controls the operation of the demand pumps?

A

The ELEC DEMAND L and R pump selectors.

95
Q

In the AUTO position, when do the left and right demand pumps operate?

A

Under the following conditions:
* System low pressure
* On the ground for the first three minutes after the second engine is started
* From takeoff thrust set to flaps retracted
* During descent and landing, from gear down or RA less than 1000 feet, to groundspeed less than 40 knots
* Thrust reverser operation

96
Q

What systems does the center hydraulic system power?

A
  • Flight controls
  • Landing gear actuation
  • Nose gear steering
  • Right and left wing spoilers
  • Trailing edge flaps
  • Leading edge slats
97
Q

What provides hydraulic power to the center hydraulic system primary flight controls?

A

The ram air turbine (RAT).

98
Q

How many electric motor-driven pumps (EMPs) are in the center hydraulic system?

99
Q

What controls the operation of the center hydraulic system electric pumps?

A

The Cl and C2 ELEC pump selectors.

100
Q

How do the two center pumps operate?

A

They alternate as a primary pump and demand pump.

101
Q

When does the center demand pump operate?

A

Under the following conditions:
* System low pressure
* On the ground for the first three minutes after the second engine is started.

102
Q

What provides hydraulic power sources for the center hydraulic system?

A

Two electric motor-driven pumps (EMPs)

EMPs are controlled by the Cl and C2 ELEC pump selectors.

103
Q

How do the two center pumps operate?

A

They alternate as a primary pump and demand pump

The primary pump operates continuously after the second engine is started.

104
Q

Under what conditions does the center demand pump operate?

A

It operates under the following conditions:
* System low pressure
* On the ground for the first three minutes after the second engine is started
* From takeoff thrust set until radio altitude exceeds 2000 feet
* Flaps or slats are in motion
* During descent when gear lever is down and radio altitude is less than 2000 feet until groundspeed is less than 60 knots

These conditions ensure hydraulic power is available when needed.

105
Q

What functionality does the center hydraulic system have in the event of a leak?

A

Isolation functionality

This functionality is managed by several isolation valves.

106
Q

What are the components involved in the hydraulic isolation system?

A

The components include:
* Nose Gear Isolation Valve (NGIV)
* Reserve Steering Isolation Valve (RSIV)
* Alternate Extend Isolation Valve (AEIV)
* Reservoir standpipe

These ensure the flight crew can lower the landing gear and maintain nose wheel steering.

107
Q

Can the isolation valves be controlled by the crew?

A

No, they operate automatically

This is crucial for maintaining safety during non-normal operations.

108
Q

What does the indication ‘LOAD SHED’ signify?

A

It indicates that one or more demand pumps have been shed to provide electrical power to other systems

This is critical during certain airplane failure modes.

109
Q

What does the Ram Air Turbine (RAT) provide when deployed?

A

5000 psi hydraulic power to the primary flight controls

The RAT also provides electrical power throughout the flight envelope.

110
Q

When does the RAT deploy automatically?

A

The RAT deploys automatically if:
* Both engines have failed
* All three hydraulic system pressures are low
* Loss of all electrical power to captain’s and first officer’s flight instruments
* Loss of all four EMPs and faults in the flight control system occur on approach
* Loss of all four EMPs and an engine fails on takeoff or landing

These scenarios necessitate the use of the RAT for safety.

111
Q

How can the RAT be deployed manually?

A

By pushing the RAM AIR TURBINE switch on the hydraulic panel

A spring-loaded actuator is used for deployment.

112
Q

What happens to the RAT once it is deployed?

A

It cannot be stowed in flight

This is important for ensuring continuous hydraulic power.

787 (38 decks)

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