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AGK - Airframes and Systems > Hydraulics > Flashcards

Hydraulics Flashcards

1
Q

In light aircraft and helicopters, brakes are operated using a (1) _________ hydraulic system, with pressure being provided by the force from the
(2) ________

A

(1) Passive, (2) Pedals

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2
Q

For transport aircraft, the reservoirs of a hydraulic system are typically pressurised by?

A

By air from the pneumatic system

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3
Q

Purpose of an accumulator in a hydraulic brake system is to?

A

Supply an emergency reserve of power in the event of a hydraulic failure

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4
Q

Why is it important to clean up any hydraulic fluid spilled on the aircraft fuselage?

A

Risk of corrosion.

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5
Q

The hydraulic device, which functionality is comparable to a diode in an electric circuit is a?

A

Check valve.

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6
Q

The purpose of pop out indicators being fitted to filters in hydraulic systems is to?

A

To warn of an impending by-pass situation.

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7
Q

When powering up a hydraulic system, the level in the reservoir will?

A

Decrease slightly

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8
Q

Large transport aeroplane hydraulic systems usually operate with a system pressure of approximately?

A

3000 psi

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9
Q

What is the function of a standpipe in a hydraulic system reservoir?

A

It supplies the main feed line.

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10
Q

The pressure in a hydraulic system is measured relative to?

A

Atmospheric Pressure

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11
Q

The purpose of a stand (stack) pipe on a supply line inside the reservoir of a typical hydraulic system is to?

A

Ensure hydraulic fluid supply for emergency hydraulic system operation

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12
Q

An aircraft hydraulic system that has low-pressure fluid flow in the system when the system actuating mechanisms are idle is referred to as?

A

An Open Centre Hydraulic System

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13
Q

In a hydraulic system, the reservoir is pressurised in order to…

A

prevent pump cavitation

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14
Q

What may happen if a mineral based hydraulic oil is used in a system designed for synthetic hydraulic oil?

A

Seal damage may occur

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15
Q

A demand pump works by supplying (1)_______ and (2)_______

A

Variable Volume

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16
Q

Hydraulic power is a function of?

A

System pressure and volume flow

17
Q

The function of a hydraulic fuse is to?

A

Prevent total system loss in the event of a hydraulic leak.

18
Q

How is filtration in a modern hydraulic system usually ensured?

A

By filters in both the pressure and return lines.

19
Q

In a hydraulic system, overheat detectors are usually installed where?

A

at the pumps.

20
Q

In transport aircraft, the pressure of hydraulic fluid can be indicated by?

A

A pressure transducer.

21
Q

Parameters to monitor a hydraulic system in the cockpit are?

A

Pressure, fluid temperature and quantity

22
Q

In an aircrafts hydraulic system, the Power Transfer Unit (PTU) is driven by?

A

Hydraulic driven pump.

23
Q

Hydraulic systems, when operating normally, are pressurised by?

A

An engine pump

24
Q

The viscosity of a hydraulic fluid should be?

A

Low to minimise power consumption and resistance to flow.

25
Q

A hydraulic low pressure alert is the first indication of?

A

The pump output pressure being insufficient

26
Q

Shuttle valves will automatically switch?

A

Hydraulically operated units to the most appropriate pressure supply.

27
Q

Pascals Law States that if a fluid in confined space is pressurised by an external force, the fluid pressure will be sensed?

A

equally throughout the fluid.

28
Q

A NRV valve can also be called?

A

A check valve.

29
Q

A Power Transfer Unit (PTU) is powered by?

A

A hydraulic motor

30
Q

What instrument readings would pilots observe if the aircraft was experiencing a gradual internal leak in the hydraulic system?

A

Low/irregular pressure, high temperature

31
Q

The function of a hydraulic selector valve is to?

A

Direct system pressure to either side of the piston of an actuator.

31
Q

What is the common operating pressure of the hydraulic system on most large transport aeroplanes?

A

3000 psi

32
Q

Assuming an accumulator is pre-charged to 1000 psi and the hydraulic system is pressurised to 1500 psi, the accumulator gauge will read?

A

1500 psi.

33
Q

What is the main purpose behind employing pressurised hydraulic reservoirs on jet transport aircraft?

A

To assure the pump inlet is provided with a continuous and adequate supply of fluid free from foaming.

AGK - Airframes and Systems (7 decks)

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