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M11 Questions > 11.11 > Flashcards

11.11 Flashcards

1
Q

What are hydraulic system pressures measured in?

A

Bar.

Example sentence: The hydraulic system pressure is measured in bar.

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2
Q

Why is it necessary to have filters in a hydraulic system?

A

They trap particles which could cause damage or failure of the system.

Additional information: Filters are essential in maintaining the integrity of the hydraulic system.

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3
Q

What materials are filter elements made from?

A

Either metal plastic or paper.

Example sentence: Filter elements can be made from metal, plastic, or paper.

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4
Q

Which type of pressure system is used in modern hydraulics systems?

A

Hydrostatic pressure.

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5
Q

Define hydraulic force.

A

Hydraulic force is equal to the hydraulic pressure multiplied over the area it is applied.

Example sentence: Hydraulic force is calculated by multiplying the hydraulic pressure by the area of application.

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6
Q

Which type of hydraulic fluid is most in most modern hydraulic systems?

A

Man made synthetic oil.

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7
Q

What are dynamic seals?

A

A type of seal that is used when stroking and rotational movement is used.

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8
Q

Describe hydraulic flow in a hydraulic sub system?

A

From reservoir to pressurisation, to distribution, to users and then back to the reservoir

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9
Q

What is the main purpose of a hydraulic reservoir?

A

To compensate for variations in hydraulic fluid caused by the operation of hydraulic components.

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10
Q

Why is there an airspace in a hydraulic reservoir?

A

The air space allows for pressure head of air to ensure positive supply of fluid to hydraulic pumps.

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11
Q

What is the purpose of the sheet metal in the bottom of the reservoir?

A

TO prevent the fluid moving upwards under negative g conditions.

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12
Q

Why are reservoirs de-pressurised?

A

To minimise the risk of injury from pressurised fluid while charging hydraulic system components.

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13
Q

Hydraulic pumps operate on which principle?

A

They use the displacement principle.

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14
Q

Why is it necessary to have filters in a hydraulic system?

A

They trap particles which could cause damage or failure of the system.

Additional information: Filters are essential in maintaining the integrity of the hydraulic system.

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15
Q

What pipelines are connected to the hydraulic pumps?

A

A hydraulic pump is connected to the reservoir by a supply line and to the user via a pressure line

Example sentence: The hydraulic pump is connected to the reservoir by a supply line and to the user via a pressure line.

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16
Q

Which component determines the hydraulic pumps piston stroke?

A

The differential angle of the wobble plate.

No additional information.

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17
Q

When a hydraulic pump is off loaded in the cockpit which component is energised?

A

The solenoid of the de-pressuring valve in the pump.

No additional information.

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18
Q

What is a demand pump?

A

It is a pump that helps main pressure when 3000 PSI cannot be maintained.

No additional information.

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19
Q

What is auxiliary pressurisation?

A

Auxiliary pressurisation supports the main pressurisation if there is a high user demand.

No additional information.

20
Q

What method is used to deploy the RAM air turbine?

A

It is deployed sprung spring.

No additional information.

21
Q

Why is a safety device required for the RAT when the aircraft is on the ground?

A

TO prevent accidental deployment which could kill or injure someone.

No additional information.

22
Q

What is the function of the power transfer unit in a hydraulic system?

A

It transfers hydraulic power from 1 system to a linked system without exchanging fluid.

No additional information.

23
Q

What component regulates a PTU’s output?

A

The variable displacement part of the PTU.

No additional information.

24
Q

Why does each hydraulic system have a manifold module fitted?

A

TO combine the main distribution components in one place.

No additional information.

25
Q

Why is a pressure relief valve fitted in the system?

A

To prevent damage to the hydraulic system due to pump malfunction.

No additional information.

26
Q

How does the pressure relief valve relieve excessive pressure?

A

The excess pressure is changed into heat energy within the valve and then returned to the reservoir.

No additional information.

27
Q

Why is a leak measurement valve fitted in the system?

A

To test for internal leakage within the system.

No additional information.

28
Q

Why is a priority valve fitted in the hydraulic system?

A

To divide a hydraulic system between high and low priority users.

Example sentence: The priority valve ensures that critical components receive hydraulic fluid before less critical components.

29
Q

Why are indicator filters used in a hydraulic system?

A

To indicate the amount of clogging in the filter.

Additional information: Indicator filters help maintenance crews know when filters need to be replaced or cleaned.

30
Q

Why are accumulators fitted in hydraulic systems?

A

To smooth out pressure fluctuations.

31
Q

Why does a low pressure filter have a bypass valve fitted?

A

It opens when the filter element is clogged to control the unfiltered return fluid back to the reservoir.

32
Q

What will cause an overheat in the hydraulic system?

A

The opening of the pressure relief valve.

33
Q

Which is a suitable method of cooling the hydraulic fluid on an aircraft?

A

By heat exchanger in the fuel tanks.

34
Q

What purpose does a pipe fitting have?

A

A fitting acts as a link between lines or between lines and other hydraulic components.

35
Q

How does a disconnect able type fitting seal the connection?

A

The area between the fitting and the sleeve creates the seal.

36
Q

What information do hydraulic pipe line markings show?

A

The aircraft system the line belongs to, its function, the direction of flow and information about the subsystem.

37
Q

What is the so called lights out philosophy?

A

That under normal conditions there are no indications on the panels.

38
Q

Why is the RAT switch guarded?

A

To prevent accidental deployment of the rat.

39
Q

What will happen when a hydraulic pump switch on the hydraulic control panel is selected to AUTO?

A

It will activate the automatic starting of the hydraulic pump.

40
Q

What are the hydraulic reservoir indications usually found on airbus aircraft?

A

The fluid level, fluid temperature, and air pressure warning.

41
Q

Why is a system computer fitted in the hydraulic system?

A

To concentrate and interpret system inputs for indication and control.

Example sentence: The system computer processes data from various sensors to ensure proper functioning of the hydraulic system.

42
Q

Where is each reservoir of the aircrafts hydraulic system replenished from?

A

From the service panel.

Additional information: The service panel allows easy access for refilling the hydraulic system reservoirs.

43
Q

Why is a leak test system required?

A

To check for internal leakage of flight control components.

Example sentence: The leak test system ensures the safety and reliability of the aircraft’s flight control system.

44
Q

How many leak test systems are fitted to an aircraft?

A

One in each hydraulic system.

Additional information: Having one leak test system in each hydraulic system helps in detecting leaks effectively.

45
Q

What is the purpose of a leak measurement solenoid valve?

A

It closes the direct fluid supply to the flight controls in each subsystem for testing purposes.

Example sentence: The leak measurement solenoid valve isolates the fluid supply to accurately conduct leak tests.

M11 Questions (21 decks)

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