AC.......................Advisory Circular – This term can also refer to alternating current electricity but in this manual it is referring to a Federal Aviation Administration (USA) bulletin with special information.
AN......................American National – Is usually part of a part number for hardware.
AWG...................American Wire Gauge – Look for this in front of a wire size number.  
BNC Connector.....Bayonet Neill-Concelman connector – A connector specially made for radio frequency cable connections.
CFR.....................Code of Federal Regulations – The book of regulations for the USA.  (It is not a single book.  It would fill a small library.)
COSPAS-SARSAT..International search and rescue consortium – For a complete description go to the website at www.cospas-sarsat.org. 
D-sub connector..D-shaped, subminiature connectors – common type of connector for small signals and electrical currents.
Drip loop.............Extra wire length used to form a U-shaped bend in a wire or cable – Water or other fluids will flow down to the bottom of the loop and drip off.  Electrical connections are made at the top of the loop. 
EASA...................European Aviation Safety Agency – See www.easa.eu.int. 
EMI.....................Electromagnetic Interference – Unwanted electronic radio type noise
ELT.....................Emergency Locating Transmitter – ELTs are used on aircraft.  The type of emergency beacon used on boats or by people has a different name.
FAA.....................Federal Aviation Administration – The US government agency for aircraft safety and regulation within the USA.
FAR.....................Federal Administration Regulations – The rule books that apply to just about everything the US government regulates.
FCC.....................Federal Communications Commission – The US government agency that regulates all radio frequency transmissions within the USA.
Flex circuit...........A flex circuit is a printed wiring board that is made on a heavy gauge flexible tape.  
G-switch..............A special type of switch that momentarily closes during a sudden acceleration or deceleration. Switch is calibrated at a specified threshold.
Lanyard...............A short string or wire that connects two items together so that they do not become separated.
LED.....................Light Emitting Diode – Semiconductor device that emits light when current is passed through it. Most common colors are red, green and blue. White and yellow are also possible.
Mil-Spec..............The US military specifications that apply to wire, hardware, electronic components, etc.  Quality is usually very high.  
　
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