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Airframe Electrical > Airframe electrical: part II > Flashcards

Airframe electrical: part II Flashcards

0
Q

Wire can either be

A

Solid or stranded

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1
Q

What two wire materials are used?

A

Copper and aluminum

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2
Q

Why is wire tinned?

A

To enhance corrosion preventative properties.

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3
Q

What strands wire is most

Commonly used?

A

19 or 37

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4
Q

What materials are used

To insulate wires?

A

Nylon, Teflon, braided fiberglass.

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5
Q

What are wires coated with in areas of high abrasion?

A

An extruded nylon jacket

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6
Q

Why are wires shielded?

A

When used in areas of electronic/magnetic sensitivity.

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7
Q

What is coaxial?

A

A special type of shielding, used in com/nav circuits. The shielding also acts as Ground or return path.

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8
Q

What is wire sized according to?

A

The AWG system, American wire gauge system.

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9
Q

What is the cross sectional area of a wire expressed in?

A

Circular mils

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10
Q

What is proper wire size based on?

A

The current carrying capability of a wire
The allowable voltage drop
Physical strength

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11
Q

What is the smallest gauge aluminum wire allowed on an aircraft?

A

8

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12
Q

What is the primary concern when routing wires?

A

To avoid heat, liquids and abrasion.

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13
Q

How far should wires be away from something so that they are clear?

A

3inches

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14
Q

What is the general bend radius of shielded wire and coaxial cables?

A

Generally 3x the diameter of individual wire and for coaxial it is 6x the diameter

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15
Q

What three purposes are there behind bundling wires?

A

Neatness,
Efficiency of routing,
Ease of troubleshooting

16
Q

How should wires in a bundle be laced together?

A

Zip ties or nylon cord

17
Q

How frequently are ties in wire bundles made?

A

Every two to three inches

18
Q

How are bundles secured to the aircraft?

A

Adel clamps.

19
Q

What materials is conduit constructed of?

A

Aluminum, braided metal, or non metallic materials.

20
Q

What are terminals used for?

A

Connecting wires to a post or a terminal strip.

21
Q

By what two methods are terminals attached?

A

Crimped on

Soldered on

22
Q

What are junction boxes used for?

A

For housing multiple terminal strips

23
Q

What are junction boxes constructed of?

A

Aluminum alloy or fiberglass

24
Q

What is splicing?

A

Attaching two conductors in a permanent way.

25
Q

What are methods of circuit protection?

A

Fuses, circuit breakers, and current limiters.

26
Q

What is the purpose of circuit protections?

A

To protect the wiring.

27
Q

What is nominal rating?

A

The continuous current flow of a device

Airframe Electrical (5 decks)

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