6.11

Question 1

What is the prime consideration for aircraft cables

Answer 1

reliability

Question 2

what are the requirements for aircraft cables

Answer 2

Minimum weight and dimensions
Resistant to fluids
Non flammability
Wide range of operating temperatures
Resistant to abrasion

Question 3

what is the rating of a cable

Answer 3

the amount of current it can carry without sustaining a significant temperature rise

Question 4

what factors affect the rating of a cable

Answer 4

If the current is continuous or intermittent

Question 5

what is a wire

Answer 5

an isolated single solid conductor or stranded conductor surrounded by insulation

Question 6

what are the 2 most common used materials for wires

Answer 6

copper and aluminium

Question 7

what is the advantage of aluminium over copper

Answer 7

it is lighter

Question 8

what is the advantage of copper over aluminium

Answer 8

it needs less space and is more conductive and doesn’t crystallise and break

Question 9

What is a cable

Answer 9

2 or more wires that are insulated separately within the same outer insulation

Question 10

what is a wire harness

Answer 10

multiple insulated wires are bound together with lacing tape, metal bands or another restriction

Question 11

what is nyvin and is it used in modern aircraft

Answer 11

a general purpose airframe cable that was one of the first and is no longer used

Question 12

how many forms of nyvin are there

Answer 12

5

Question 13

what is efglas

Answer 13

a high temperature resistant cable

Question 14

what is a thin wall cable

Answer 14

general purpose cable that has replaced nyvin

Question 15

what are the three different temperature ratings for a wire

Answer 15

up to 100/150ºC is normal
Up to 260ºC is high temperature
Up to 1093º for 15 mins is fire resistant

Question 16

what is a shielded cable and why is it used

Answer 16

used to stop the magnetic field caused by current by either cancelling it out or surrounding it so it can’t escape

Question 17

what can be used to measure the size of a solid conductor in a wire

Answer 17

a wire gauge stencil

Question 18

how does a wire gauge stencil measure the size of a wire

Answer 18

the insulation is stripped and the conductor is slotted in until it cannot fit then it is pushed through to see the size

Question 19

What does a dashed green line signify

Answer 19

the wire is measured in metric

Question 20

what are the 2 different types of markings on cables and wires

Answer 20

manufacturer part number and the instillation system its a part of

Question 21

What are the 2 types of wire markings

Answer 21

direct and indirect

Question 22

What is a high tension cable used for

Answer 22

high voltages in engine ignition systems

Question 23

what does a co-axial cable transmit

Answer 23

radio frequency energy

Question 24

what is a co-axial cable designed to prevent

Answer 24

radio frequency interference

Question 25

what does crimping do

Answer 25

connects a wire conductor to a terminal or contact without using solder

Question 26

how does crimping work

Answer 26

attaches a terminal or contact end to a conductor by pressure, forming or reshaping a metal barrel together with the conductor

Question 27

what is the crimping process (rules)

Answer 27

select correct stripping tool, stripping the wire to the correct size, making sure lay of cable strands is correct, use correct connector, use correct crimping tool , use a test piece, crimp the contact and wire

Question 28

what is splicing

Answer 28

joining 2 or more wires together for repair or modification

Question 29

what are the 2 forms of splicing

Answer 29

in-line repair splice and fly-lead attachment splice

Question 30

where can in-line splices not be used

Answer 30

autopilot circuits, inside electrical conduit trunking, fire-protection circuits, oxygen systems,coaxial cable, multi-core cable

Question 31

what is the purpose of a turret head

Answer 31

to position the contact correctly

Question 32

what is a connector

Answer 32

a device that provides a semi-permanent connection to avionic components or equipment

Question 33

What does a circular connector consist of

Answer 33

a receptacle and a plug

Question 34

when installed with an axis that is horizontal where is the master keyway

Answer 34

at the top

Question 35

what is the order for contact configuration for letters

Answer 35

upper case then lower case then double upper case then double lower case

Question 36

what letters cannot be used for contact counting

Answer 36

I,O,Q,l,o

Question 37

as the AWG number gets higher does the size of the wire get bigger or smaller

Answer 37

smaller