Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
35 Cards in this Set
- Front
- Back
Metals used for the majority of aircraft electrical wiring
|
Copper & Aluminium
|
|
What are Lays
|
Wire strands arrangement
|
|
Why are conductors stranded
|
Provides wire flexibility
|
|
Why are conductor strands plated
|
Provides corrosion protection
|
|
The common conductor strand plating materials
|
Nickel, tin & silver
|
|
Why are conductor strands annealed
|
Provides wire flexibility
|
|
The purpose of wire/cable Insulation
|
Provides protection against short circuit and environmental conditions
|
|
Application methods of wire/cable insulation
|
Extruded and Wrapped
|
|
Main properties of Polyimide
|
Man made insulation tape material, applied to conductor by wrapping
|
|
What is Carbon arc tracking
|
Phenomenon where polyimide insulation forms conductive path when subjected to heat (typically from short circuit)
|
|
What is Wet tracking
|
Carbon arc tracking where moisture/fluid acts to unravel polyimide tape and as a low resistance path
|
|
What is Dry tracking
|
Carbon arc tracking where chaffing acts to breakdown polyimide insulation
|
|
What does AWG mean
|
American Wire Gauge
|
|
What does CSA mean
|
Cross Sectional Area (metric)
|
|
What does CMA mean
|
Circular Mil Area (imperial)
|
|
Wire propeties if AWG number reduced
|
Increases cross-section of conductor, decreases overall resistance and increases current carrying capability
|
|
Wire propeties if AWG number increased
|
Decreases cross-section of conductor, increases overall resistance and decreases current carrying capability
|
|
Main reason for using aluminium as conductor
|
Typically used for large current over long distances
|
|
Define Airframe wire/cable classification
|
Sufficiently robust wire to satisfy the requirements of ‘Open’ airframe wiring and the general wiring of Powerplants
|
|
Define Interconnect wire/cable classification
|
Used in protected areas of wiring such as the interconnection of equipment within racks, junction or relay boxes
|
|
Define Equipment wire/cable classification
|
Used within equipment such as LRU (Line Replaceable Unit)
|
|
What is the basic construction of Single core wire
|
One insulated conductor
|
|
What is the basic construction of Multi core cable
|
Multiple insulated conductors twisted together with an outer insulating jacket
|
|
What is the basic construction of Shielded wire
|
Insulated conductor surrounded by a metallic sheath, then enclosed in an outer insulating jacket
|
|
What is the basic construction of Multi core shileded cable
|
Multiple insulated conductors twisted together surrounded by a metallic sheath, then enclosed in an outer insulating jacket
|
|
What is the basic construction of Databus cable
|
Two insulated conductors (one blue insulation, one white insulation) twisted together surrounded by a metallic sheath, then enclosed in an outer insulating jacket
|
|
What is the basic construction of Coaxial cable
|
Typically used sed for radio signals, it has a centre conductor covered by a inner insualtion (dielectric) surrounded by a metallic braided conductor then enclosed in an outer insulating jacket
|
|
What is the basic construction of High tension cable
|
Designed for high voltages, it is a stainless steel conductor in one or two layers of rubber/silicone insulation, surrounded by a metal braided shield
|
|
What is the basic construction of Thermocouple cables
|
Typcially nickel chromel and nickel alumel conductors individually insulated which are then either flat-laided or twisted within an taped outer sheath.
|
|
Properties of Fire resistant wire/cable
|
Must retain a defined level of electrical insulation in the presence of a fire for 5 minutes.
|
|
Properties of Fire proof wire/cable
|
Required to operate for fifteen minutes in a designated fire.
|
|
How is wire/cable stored
|
Typcially on drums/reels, sealed ends
|
|
Precaustions when handling wire/cable
|
Not dragged over rough surfaces, not kinked
|
|
What is the minimum bend radius of single wire/cable
|
Minimum bend radius should be 10 times the outside diameter of the wire/cable
|
|
What is the minimum bend radius of bend radius of a bundle
|
Minimum bend radius of a bundle is six times the diameter of the bundle
|