Electrical Wiring Flashcards
The 3 materials that most aircraft wirings are coated with
- Tin 2. Nickel 3. Silver
Most common insulation material for aircraft wires
Teflon
2 disadvantages of aluminum wiring
- Crystalizes when subjected to high vibration 2. Can only carry 2/3 of the current that the same gauge of copper wire can
What to do when the sistuation calls for a replacement of a copper wire with an aluminum wire
Always to replace a copper wire with an aluminum wire that is 2 wire gauges greater than copper
The standard system for measuring wire gauges
American wire gauge (AWG)
The typical smallest wire gauge used on aircraft
22 gauge wire
3 factors affecting how much current a wire is capable of of carrying
- Cross sectional area 2. Conductive material 3. Length of wire
The system of How the cross sectional area of a wire is expressed in
Circular mill
One circular mil is equal to ______ inches
0.001 inches
The method for finding the cross sectional area of a round conductor in circular mils
Square the diameter Multiply the diameter by itself
The location for where square mills wires are used
Bus bar connections
The 3 factors that need to be considered for when choosing a wire to install
- System voltage 2. Allowable voltage drop 3. Duty cycle
Indentiiciation markings on wires are required to be labeled every ____ to _____ inches along the wire
12-15 inches along the wire
The 2 ways that electrical wires may be installed on aircraft
- Open 2. In a conduit
Rule with in regards to wire bundle installation and main and back up systems
No single bundle should contain wires for both main and back up systems
Once the wires in a bundle are assembled, the knots should be tied every
Knots on wire bundles should be tied every 4 inches
The type of material used to tie knots on wire bundles
Nylon
The two knots and the sequence in which the knots are tied for electrical wire bundles
Close hitch followed by a square knot
Wire bundles should be at least _____ inches away from any control cable
3 inches
What helps prevent wires from being damaged by fluids that leaks into low areas
Installing wires on the side walls or overhead prevents
The standard rule for when installing electrical wires parallel to oxygen lines or fluid lines
Install wires 6 inches above fluid or oxygen lines
Installing electrical wire at a heigh of 6 inches only deals with _____ lines and ______ lines
Oxygen, fluid
Any bundle that passes through a bulkhead should be
Clamped to a bracket
If less that a 1/4 inch clearance exists between the bundle and the bulkhead hole, this must be done
Rubber grommet must be installed when
A rubber Gromet must be installed on a wire bundle when
1/4 inc clearance exhaust between the bundle and the bulkhead
When electrical wire bundles must make a bend, the good practice is to use a bend radius which is
10 times the bundle diameter
The inside diameter of the conduit must be ______ than the _______ of the wire bundle
inside diameter of the conduit must be 25% larger than wire bundles maximum diameter
The means of securing conduits in aircraft
Conduits are secured with clamps
The method of protecting aircraft instrumentation from the magnetic field developed by open wires or wires in conduits
Shielding method
The reason why a two-conductor twisted wire would be used to carry current to and from a light that illuminates the compass card
A way of canceling the magnetic field produced by the wire, carrying a current
The term for intercepting electrical energy and shunting it to an electrical ground
Shielding
The two metals used to shield electrical wires
- tin 2. cadmium
10-12 gauge color
14-16 gauge collor
18-22 gauge color
Hook terminal
Slotted terminal
The type of corrosion that can occur at terminal/ wire junction
Galvanic corrosion
The type of wire/ conductive material that requires special attention when, stripping and attaching a terminal to it
Aluminium wire
The FAA prefered crimping tool for wires and terminals
Racheting-type crimping tool
What is required of a racheting-type crimping tool being that it is considered a precission instrument
Caibrated
Conduit
- conductor
- primary insulation
- shielding
- external jacket
