Aircraft Electronics Technician AET - NCATT

NCATT Aircraft Electronics Technician (AET) Study Guide
• MIL-W-273000
• Common Insulating Materials
o Includes plastic, rubber, glass, ceramics, air (vacuum), or oil
• Conductors
o Includes conductors made of copper and aluminum
o Silver is very expensive, but it is sometimes used for conductors
o Copper conductors have higher conductivity than aluminum.
o Copper conductors are more ductile, have relatively high tensile strength, and are
more easily soldered than aluminum
o Copper conductors are more expensive and heavier than aluminum conductors
o Aluminum conductors have 60% of the conductivity of copper
o Aluminum conductors weigh less than copper
• Conductor Plating to Prevent Corrosion (Oxidation)
o Includes tin, silver, and nickel
• Criteria for the Selection of Electrical Wire
o Abrasion resistance
o Arc resistance (non-carbon tracking)
o Corrosion resistance
o Cut-through strength
o Flame resistance
o Fluid resistance
o Heat distortion temperature resistance
o Notch propagation resistance
o Smoke emissions resistance
• Multiconductor Aircraft Wire used for aircraft electrical power distribution systems (Two
or more insulated wires in the same jacket) provides:
o Dielectric strength
o Impact strength
o Mechanical strength
• Sleeving Types
o Vinyl Sleeving
o Nylon Sleeving
o Silicon Rubber
o Silicon Fiberglass
Single Conductor Aircraft Wire:
Individuals should be able to explain single conductor aircraft wire and its uses with reference to
the following terms:
• Single Conductor Aircraft Wire
o One insulated wire in a jacket
Copyright © 2012 by the National Center for Aerospace & Transportation Technologies. All rights reserved. Individuals may
download, print, and make copies of this document for their own personal use. Commercial use prohibited.
Page 49 of 60