6.11

Question 1

List the desirable/required features of a wire to be used on aircraft (electrics)

Answer 1

Minimum weight + dimensions
Resistance to fluids
Non-flammable
Wide range of operating temperatures
Resistant to abrasion
Wet arc tracking
Application
Rating

Question 2

What does AWG stand for?

Answer 2

American wire gauge.

Question 3

What does the following define…?

Isolated single solid conductor or stranded conductor, surrounded by insulation.

Answer 3

A wire

Question 4

What is nyvin

Answer 4

A type of cable not used since 1990 due to weight

Question 5

What superseded nyvin and why was it a better cable

Answer 5

Thin walled cables.
Lighter and better performance.

Question 6

What are aluminium wires used for (electricity)

Answer 6

Large loads

Question 7

Why are copper wires used

Answer 7

For maximum wire flexibility.

Question 8

Qualities of good Wire insulation

Answer 8

Resistant up to 600 v
Highly flexible
Lightweight
Resistant against aircraft fluids.

Question 9

Temp. ranges for wires (electrics)

Answer 9

Normal = 100/150
High temp = 260 degrees
Fire resistant = 1093 degrees for 15 mins

Question 10

Shielded cables

Answer 10

Prevents electromagnetic interference with things like : antennas, receivers or transmitters.

Called coaxial cables.

Question 11

Wire substitutions

Answer 11

All wire substitutions to be made in accordance with electrical manuals

Question 12

Wire sizing

Answer 12

Uses AWG system
0 is the largest sized wire
Bigger the number, smaller the wire.
24 is the smallest used on aircraft and has a diameter of 0.5mm

Question 13

Direct and indirect methods of marking wire

Answer 13

Direct - printed on the cables covering
Indirect - heat shrikable sleeve

Question 14

Thermocouples

Answer 14

Utilise the thermo-electric effect.
Iron + constantan in light aircraft w/ reciprocating engines
Chrome and allumer are used also
Copper+ constantan used in older aircraft

Question 15

What determiners a successful crimp?

Answer 15

Conductor
Crimp barrel
Crimp tool

Question 16

What is MS22520 (Daniel’s)

Answer 16

The most common type of crimping tool

Question 17

What is splicing

Answer 17

Process of joining two or more wires together for repair or modification

Question 18

Where must you not use an inline splice?

Answer 18

Fire protection circuit
Fire zones
Oxygen systems
Autopilot circuits.

Question 19

What is a connector

Answer 19

A devices that provides a semi permanent connection.
Allow for quick replacement or addition of wires.

Question 20

What are rectangular connectors used for (in reference to electrics)

Answer 20

LRU’s and equipment racks use these