Chapter 8 Section C Jeppensen Airframe

Question 1

Virtually all modern airplanes use a simple hydraulic system to operate the _____.

Answer 1

Brakes

Question 2

A hydraulic system must contain four basic types of units, these are;

Answer 2

A suitable fluid
A fluid reservoir
A pump
Actuators

Question 3

A single unit containing an electrically driven hydraulic pump, reservoir, control valve and many of the auxiliary valves is known as a hydraulic _______ system.

Answer 3

Power pack

Question 4

The two types of hydraulic-reservoirs are:

Answer 4

Integral
In-line

Question 5

Aircraft that operate in the lower altitudes normally use _______ (pressurized or unpressurized) hydraulic reservoirs.

Answer 5

Unpressurized

Question 6

Three ways of pressurizing a hydraulic reservoir are:

Answer 6

An aspirator in the return line
Bleed air
Piston type

Question 7

One micron is equal to _____ Inch

Answer 7

0.000039

Question 8

Pleated paper micronic filters are usually installed in the hydraulic system _________ line.

Answer 8

Return

Question 9

Cuno filters _______be used on the pressure side of the hydraulic system.

Answer 9

Can

Question 10

________ - action pumps are the most common type of hand pump.

Answer 10

Double

Question 11

A ______ each time its shaft turns. Displacement pump moves a specific volume of fluid each time its shaft turns.

Answer 11

Constant

Question 12

A(n) ______ valve of some sort is needed when a constant displacement pump is used.

Answer 12

Relief

Question 13

A gear-type hydraulic pump is a _______ displacement pump.

Answer 13

Constant

Question 14

A hydraulic system using a variable displacement pump ________ (does or does not) require an
unloading valve.

Answer 14

Does not

Question 15

A selector valve is one of the most common types of _______ (flow or pressure)-control valves.

Answer 15

Flow

Question 16

The _______ (open or closed)-center valve directs fluid through the center of the valve back to the reservoir when a unit is not being actuated.

Answer 16

Open

Question 17

A valve that allows free flow of fluid in one direction, but no flow in the opposite directions called a(n) ______ valve.

Answer 17

Check

Question 18

A valve that allows free flow of fluid in one direction but a restricted flow in the opposite is called a(n) _______ ________ valve.

Answer 18

Orifice Check

Question 19

A valve that requires one component to fully actuate before another ran actuate is called a(n)
_______ valve.

Answer 19

Sequence

Question 20

_______ valves are similar to sequence valves except they are opened by hydraulic pressure rather than by mechanical contact.

Answer 20

Priority

Question 21

A(n) _______ _______ may be installed to block a line in case of a serious leak.

Answer 21

Hydraulic Fuse

Question 22

Two principles upon which a hydraulic fuse may operate are:

Answer 22

Pressure drop across the fuse

Volume of fluid passing through the fuse

Question 23

The simplest type of pressure control valve is the ______valve.

Answer 23

Relief

Question 24

A(n) ______ ______ may be installed when it is necessary to operate some portion of a hydraulic system at a pressure lower than the normal system pressure.

Answer 24

Pressure Reducer

Question 25

A(n) _______ is a simple device designed to store hydraulic fluid under pressure.

Answer 25

Accumulator

Question 26

One compartment of an accumulator is connected to the hydraulic system, and the other compartment is filled with compressed _______ or _______.

Answer 26

Air
Nitrogen

Question 27

Three types of accumulators used in aircraft hydraulic systems are:

Answer 27

Piston Type
Bladder Type
Diaphragm Type

Question 28

High pressure valve cores are identified by the letter _______ embossed on the end of their stem.

Answer 28

H

Question 29

Hydraulic actuators which produce straight-line movement are known as ______ actuators.

Answer 29

Linear

Question 30

If a continuous rotational force is needed, a hydraulic ______ may be used.

Answer 30

Motor

Question 31

A chevron seal is a _______ (one-way or two-way) seal.

Answer 31

One-way

Question 32

An O-ring is a ________ (one-way or two-way) seal.

Answer 32

Two-way

Question 33

An O-ring should have a width of approximately 10% ________ (larger or smaller) than the width of the groove into which it fits.

Answer 33

Larger

Question 34

A _______ _______ should be used with an O-ring whenever the operating pressure exceeds about _____ psi.

Answer 34

Backup ring, 1500

Question 35

The ______ date is the date of O-ring manufacture.

Answer 35

Cure

Question 36

An O-ring marked with a blue dot _____ (would or would not) be compatible with MIL-H-5606 hydraulic fluid.

Answer 36

Would

Question 37

When installing O-rings, extreme care must be used to prevent the ring from being ______ or ______ by sharp edges.

Answer 37

Nicked
Damaged