Chapter 25 Study Questions Flashcards
Hazardous areas for wiring on large aircraft are known as SWAMP. What does it mean?
Severe Wind and Moisture Problems
What type of wire should never be used for new work on an airplane?
The re-use of old existing wiring, anything less than aviation grade wiring, or PVC wiring.
Why are stranded wires preferred over solid wire for aircrafts?
Stranded wires are flexible and less susceptible to being cold-worked from vibration like solid wires.
What type of insulation is found on wire used in many aircraft today?
Coaxial cable that has one center conductor surrounded by a dielectric (insulation) and an outer jacket.
As the AWG number for a wire size goes up, the wire diameter_______?
The diameter size goes down as the numbers go up.
Which wire has the larger diameter; 00 or 36?
00
A. Is it permissible to use wire of greater diameter than required?
B. Are there any disadvantages?
A. Yes you may use a larger size diameter.
B. Disadvantages are
- A bigger conductor may not fit into the connector or terminal
- It might take up more room in a clamp.
- It adds weight and size.
What is the most important rule for selecting wire size and type?
Follow the equipment manufacture’s guidance.
Unshielded wires are more susceptible to picking up or radiating______?
Electromagnetic interference (EMI)
What should you avoid when stripping insulation from wire?
Avoid using low-cost/cheap wire strippers.
How many splices may you insert in a length of wire running between two terminals?
No more than 1 splicing.
Why should a wire be labeled every 15 inches along its length?
For easier wire route tracing with the eye.
What two types of cables should be kept apart to avoid interference?
Keep power and transmitter cables outside the bundle that carry low-level radio, audio, digital and control signals.
Why is it important to keep wire bundles from touching aircraft structures?
To avoid the aircraft vibration causing chafing and abrasion.
Why should wiring be supported away from the bottom of the fuselage?
To prevent corrosion from the moisture that forms and settles at the lowest point of the aircraft.
