FCC Federal Communications Commission – The US government
agency that regulates the public use of the radio airwaves
G-switch An accelerometer that senses sudden changes in speed. This is
used to active the ELT after a crash
LED Light Emitting Diode Semiconductor device that emits light
when activated. This unit uses both red and green
LEO Low Earth Orbiting One of the satellite constellations used for
detecting 406 beacons
Mil-Spec The US military specifications that apply to wire, hardware,
electronic components, etc. Quality is usually very high
P/N Part Number The identifier for each part that has been
assigned by the manufacturer
PVC Poly-Vinyl- Chloride A type of exterior coating for some wires. It is not
generally accepted as airworthy as some variants release poly-cyanide
gases when burned
Retrofit To remove old systems and install ones in their place
RMI Radio Magnetic Interference
Electrical noise generated by Radio
Frequencies that are transmitted into other electronic devices
RF Radio Frequency The energy that is transmitted from the device
RTCA Radio Technical Commission for Aeronautics US agency that sets
standards for airworthiness. See
SAR Search and Rescue The system, usually government controlled, for
locating and rendering aid to those in distress.
SMA The special type of connectors for the GPS Antenna Connectors
STC Supplemental Type Certificate A change in the original type certificate
(TC) that allows for modification from the original design. This guarantees
the airworthiness of the aircraft after modification
Sub-D Sub-miniature electrical connector Used for electrical interface between
the ELT and remote switch (looks like a D)
TSO Technical Standard Order The Federal Aviation Administration issues
TSOs to indicate approval of a manufactured item for use on aircraft.
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