Module 6/2

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Spring index is

the ratio of mean coil diameter to wire diameter C= D/d

If a spring has ‘closed ends’ the first and last coils have

zero pitch

Springs are mainly made from

carbon spring steel, Inconel or stainless steel

is used on many Cessna aircraft landing gear.

Leaf spring

Spring hooks are subjected to

bending load

Custom shaped compression springs include

conical, hourglass or barrel shaped

Brass springs has good electrical conductivity

but is unsuitable for high-stress applications.

Most aircraft shock absorber is a

helical compression spring

is the most important factor that can affect a choice of material for using in springs

The strength of the material

is the permanent distortion which occurs when a spring is stressed beyond of the elastic limit of the material

set

Elasticity is the property of the springs which allows them to absorb energy

by distorting or deflecting under load

another name for Pneumatic springs is

gas dampeners

Light – and medium-sized aircraft .

Bungee cords may be encountered on many

metallic springs may require corrosion protection. Protective coatings may be of

plastic, zinc, nickel, chromium or tin

Pneumatic spring to

dampen out dynamic motion in mechanical systems

Linear expansion of a rotating shaft in housing can be compensated for by using

roller bearings

A single angular contact bearing can take

radial loads and axial loads in one direction only

A small amount of shaft misalignment can be tolerated by using

toroidal roller bearing type

Tapered roller bearings consist of

cone shaped inner and a cup shaped outer race and tapered rollers

Needle roller bearings are used

where space saving is an important factor

loads on tapered roller bearings are

radial and thrust

A crankshaft would be fitted with a

spherical roller bearing

A mechanical device used to reduce friction and guide motion of two or more parts which articulate in differing directions.

Bearing

Needle bearings resist

radial load only

In general, the cages for bearings can be classified as

pressed, solid or pin-type cages

Spherical roller bearings

can accept a small amount of misalignment

spherical bearings. consist of an inner and outer race separated by single row of hardened

steel rollers instead of balls

is a type of bearings have two rows of spherical rollers with a common spherical path on the outer ring

Toroidal (crowned) roller bearings

Many bearings are prone to experiencing both

radial and thrust loads

Bevel gears are used to transmit power between

shafts in the same axis

Worm drives operated in shafts which are

non-parallel and non-intersecting

On a chain assembly , a change in direction of straight line motion in two planes is achieved by

using bi-planer blocks

When not under load a pair of gears

sits in the middle

is a type of gear would be used on propeller reduction gearbox

Epicycle

The larger diameter on a bevel gear is called

heel

Non-reversible chains are similar to standard chains except that each outer plate is extended in

one direction in order to break up the symmetry of the chain to prevent the chain from being assembled incorrectly

are the most common and cheapest type of gears

Spur gears

The teeth of a gear would normally

case hardened

are necessary in a main rotor gearbox of helicopter.

Conformal gears

If both the drive gear and driven gear have the identical number of teeth

no mechanical advantage is gained

The main reason for a slipping belt of pulley is

too much pre-tensioning

are the transmission forms that are typically used on aircraft.

Belt and pulley drives, Screw jacks and Chains

are toothed wheels used to transmit power between components of a machine where the centre distances between the shafts is limited.

Chains

When two gears are running together the larger one is called

a gear

When two gears are running together the smaller one is called

a pinion

the purpose of bell cranks is

to make angle changes between push-pull rods and to gain mechanical advantages

Control cables of American and European manufacture are classified by their

nominal diameter

After swaging an end fitting onto a flexible control cable with a Nicopress tool, it is it tested for adequate deformation by

using a go/no-go gauge

Cable fairleads should usually

never be lubricated

The ability of a cable to withstand abrasion is determined by the size and composition of the outer wires and

the construction of the cable

cable is flexible only in one plane

A bowdenflex

An American type Turnbuckle is in safety when

all of the fitting threads are engaged in the barrel

Pulleys are usually manufactured from

resin impregnated fibre materials

A cable tension regulator will be installed in a flying control system to

allow for variations in temperature which will vary the cable tension

The vast majority of aircraft control cables are terminated with swaged terminals , that must be checked with

go-no-go gauge before and after

If all instructions issued by the swaging tool manufacturer are followed when swaging a cable terminal, the resultant swaged terminal strength should be

the full rated strength of the cable

is an acceptable safety device for a turnbuckle to be locked when installed on aircraft cable.

Spring clip

Control cable are protected from riding off the pulley by

Guards

control cable is considered non flexible cable.

1x7

Aircraft control cable designated as 7x19

consists of 7 strands, each containing 19 wires

Aircraft control cable designated as 7x7

consists of 7 strands, each containing 7 wires

to make changes in direction of a control cable

Pulleys

7x7 control cable has seven strands wire each with

7 wires

Cables have a specified maximum continuous operating temperature and for many types in general, it is undesirable to contribute more

than 40⁰C rise by electrical heating and that operating temperature and installed life are directly related

The temperature rating of an airframe cable is determined by

its construction

The receptacle is normally part of the equipment or

structure and is stationary

The removable half which mates with the receptacle and is usually

at the end of a cable/lead

The purpose of keyways on a connector to

allow only plug and receptacle of the same orientation to be connected together

TNC used in

a high vibration area

The TNC (threaded nut coupling) series connector is a threaded version of the BNC and operates to the same specification as the

BNC connector

There are two types of Co‑axial connector

TNC and BNC

Restricted entry for the ring tongue terminals are

identified by a thin coloured band along the barrel insulator

What is the purpose of screening on a coaxial cable

To prevent EMF radiating out from the Core cable and prevent induced EMF into the core

Material commonly used as the dielectric in Co‑axial cable is

polyethylene

Tin plated copper maximum continuous temperature

135ºC

Nickel clad plated copper maximum continuous temperature

260ºC

What cable would you use where temperatures are going to exceed 200 degrees C

Nickel plated

What type of insulation cannot be stripped with thermal strippers

PTFE

coating Kapton insulation with a layer of Teflon is a way of

reducing the risk of arc tracking

Oxide on exposed silver plated wire is

an insulator

Interconnect cables employ

thinner insulation than airframe types

An interconnect cable has what insulation

Thinner than airframe cable

Dielectric loss in coaxial cable result from

heating the dielectric material (insulation)

Use of crimped splices in

aircraft electrical cables

A crimped splice is never to be used in

a multi-core cable

Compared to other types of electrical connectors crimping does not have the advantage of

assembly without tools

The TNC (threaded nut coupling) series connector is a threaded version of the BNC and operates to the same specification as

the BNC connector

The TNC series of connectors are used

predominately where vibration is a major factor as they rely on external locking for security

Mechanical protection can be provided for the cable by routing the bundles through either

flexible or rigid conduit

The size of the conduit is normally an inside diameter

25% larger than the diameter of the cable bundle being encased

How are flexible hoses categorized

By maximum pressure

There are commonly four types of cable strippers available which are:

A rotary device which cuts around the cable ❖ A four-action device, which is a high precision cut and strip tool

Thermal removes the insulation

by melting

Aluminium cable where large amounts of current must be carried for

long distances

There are a number of factors to consider when choosing the correct cable, these are

Flexibility of the cable

The most commonly used wrapped insulation material is

Kapton

Co‑axial cable is used as a transmission line for

radio frequency (RF) signals

Module5

Module5

Module 5 1

Module 5 1

Module 2

Module 2

Module2 /1

Module2 /1

Module9

Module9

Module 10

Module 10

Module 10/1

Module 10/1

Module 6

Module 6

Module 6/1

Module 6/1

問題一覧

Spring index is

the ratio of mean coil diameter to wire diameter C= D/d

If a spring has ‘closed ends’ the first and last coils have

zero pitch

Springs are mainly made from

carbon spring steel, Inconel or stainless steel

is used on many Cessna aircraft landing gear.

Leaf spring

Spring hooks are subjected to

bending load

Custom shaped compression springs include

conical, hourglass or barrel shaped

Brass springs has good electrical conductivity

but is unsuitable for high-stress applications.

Most aircraft shock absorber is a

helical compression spring

is the most important factor that can affect a choice of material for using in springs

The strength of the material

is the permanent distortion which occurs when a spring is stressed beyond of the elastic limit of the material

set

Elasticity is the property of the springs which allows them to absorb energy

by distorting or deflecting under load

another name for Pneumatic springs is

gas dampeners

Light – and medium-sized aircraft .

Bungee cords may be encountered on many

metallic springs may require corrosion protection. Protective coatings may be of

plastic, zinc, nickel, chromium or tin

Pneumatic spring to

dampen out dynamic motion in mechanical systems

Linear expansion of a rotating shaft in housing can be compensated for by using

roller bearings

A single angular contact bearing can take

radial loads and axial loads in one direction only

A small amount of shaft misalignment can be tolerated by using

toroidal roller bearing type

Tapered roller bearings consist of

cone shaped inner and a cup shaped outer race and tapered rollers

Needle roller bearings are used

where space saving is an important factor

loads on tapered roller bearings are

radial and thrust

A crankshaft would be fitted with a

spherical roller bearing

A mechanical device used to reduce friction and guide motion of two or more parts which articulate in differing directions.

Bearing

Needle bearings resist

radial load only

In general, the cages for bearings can be classified as

pressed, solid or pin-type cages

Spherical roller bearings

can accept a small amount of misalignment

spherical bearings. consist of an inner and outer race separated by single row of hardened

steel rollers instead of balls

is a type of bearings have two rows of spherical rollers with a common spherical path on the outer ring

Toroidal (crowned) roller bearings

Many bearings are prone to experiencing both

radial and thrust loads

Bevel gears are used to transmit power between

shafts in the same axis

Worm drives operated in shafts which are

non-parallel and non-intersecting

On a chain assembly , a change in direction of straight line motion in two planes is achieved by

using bi-planer blocks

When not under load a pair of gears

sits in the middle

is a type of gear would be used on propeller reduction gearbox

Epicycle

The larger diameter on a bevel gear is called

heel

Non-reversible chains are similar to standard chains except that each outer plate is extended in

one direction in order to break up the symmetry of the chain to prevent the chain from being assembled incorrectly

are the most common and cheapest type of gears

Spur gears

The teeth of a gear would normally

case hardened

are necessary in a main rotor gearbox of helicopter.

Conformal gears

If both the drive gear and driven gear have the identical number of teeth

no mechanical advantage is gained

The main reason for a slipping belt of pulley is

too much pre-tensioning

are the transmission forms that are typically used on aircraft.

Belt and pulley drives, Screw jacks and Chains

are toothed wheels used to transmit power between components of a machine where the centre distances between the shafts is limited.

Chains

When two gears are running together the larger one is called

a gear

When two gears are running together the smaller one is called

a pinion

the purpose of bell cranks is

to make angle changes between push-pull rods and to gain mechanical advantages

Control cables of American and European manufacture are classified by their

nominal diameter

After swaging an end fitting onto a flexible control cable with a Nicopress tool, it is it tested for adequate deformation by

using a go/no-go gauge

Cable fairleads should usually

never be lubricated

The ability of a cable to withstand abrasion is determined by the size and composition of the outer wires and

the construction of the cable

cable is flexible only in one plane

A bowdenflex

An American type Turnbuckle is in safety when

all of the fitting threads are engaged in the barrel

Pulleys are usually manufactured from

resin impregnated fibre materials

A cable tension regulator will be installed in a flying control system to

allow for variations in temperature which will vary the cable tension

The vast majority of aircraft control cables are terminated with swaged terminals , that must be checked with

go-no-go gauge before and after

If all instructions issued by the swaging tool manufacturer are followed when swaging a cable terminal, the resultant swaged terminal strength should be

the full rated strength of the cable

is an acceptable safety device for a turnbuckle to be locked when installed on aircraft cable.

Spring clip

Control cable are protected from riding off the pulley by

Guards

control cable is considered non flexible cable.

1x7

Aircraft control cable designated as 7x19

consists of 7 strands, each containing 19 wires

Aircraft control cable designated as 7x7

consists of 7 strands, each containing 7 wires

to make changes in direction of a control cable

Pulleys

7x7 control cable has seven strands wire each with

7 wires

Cables have a specified maximum continuous operating temperature and for many types in general, it is undesirable to contribute more

than 40⁰C rise by electrical heating and that operating temperature and installed life are directly related

The temperature rating of an airframe cable is determined by

its construction

The receptacle is normally part of the equipment or

structure and is stationary

The removable half which mates with the receptacle and is usually

at the end of a cable/lead

The purpose of keyways on a connector to

allow only plug and receptacle of the same orientation to be connected together

TNC used in

a high vibration area

The TNC (threaded nut coupling) series connector is a threaded version of the BNC and operates to the same specification as the

BNC connector

There are two types of Co‑axial connector

TNC and BNC

Restricted entry for the ring tongue terminals are

identified by a thin coloured band along the barrel insulator

What is the purpose of screening on a coaxial cable

To prevent EMF radiating out from the Core cable and prevent induced EMF into the core

Material commonly used as the dielectric in Co‑axial cable is

polyethylene

Tin plated copper maximum continuous temperature

135ºC

Nickel clad plated copper maximum continuous temperature

260ºC

What cable would you use where temperatures are going to exceed 200 degrees C

Nickel plated

What type of insulation cannot be stripped with thermal strippers

PTFE

coating Kapton insulation with a layer of Teflon is a way of

reducing the risk of arc tracking

Oxide on exposed silver plated wire is

an insulator

Interconnect cables employ

thinner insulation than airframe types

An interconnect cable has what insulation

Thinner than airframe cable

Dielectric loss in coaxial cable result from

heating the dielectric material (insulation)

Use of crimped splices in

aircraft electrical cables

A crimped splice is never to be used in

a multi-core cable

Compared to other types of electrical connectors crimping does not have the advantage of

assembly without tools

The TNC (threaded nut coupling) series connector is a threaded version of the BNC and operates to the same specification as

the BNC connector

The TNC series of connectors are used

predominately where vibration is a major factor as they rely on external locking for security

Mechanical protection can be provided for the cable by routing the bundles through either

flexible or rigid conduit

The size of the conduit is normally an inside diameter

25% larger than the diameter of the cable bundle being encased

How are flexible hoses categorized

By maximum pressure

There are commonly four types of cable strippers available which are:

A rotary device which cuts around the cable ❖ A four-action device, which is a high precision cut and strip tool

Thermal removes the insulation

by melting

Aluminium cable where large amounts of current must be carried for

long distances

There are a number of factors to consider when choosing the correct cable, these are

Flexibility of the cable

The most commonly used wrapped insulation material is

Kapton

Co‑axial cable is used as a transmission line for

radio frequency (RF) signals