ARTEX PRODUCTS / ACR ELECTRONICS, INC
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
ELT 345 (P/N: A3-06-2880)
Page 15 of 58
25-62-35
FSDO
Flight Standards District Office – FAA district offices responsible for aircraft certification,
operation, maintenance and modification issues, approvals and enforcement.
G-SWITCH
Velocity switch that detects sudden deceleration and is used to automatically activate an
ELT; may also be referred to as a “crash sensor”.
LED
Light Emitting Diode – Semiconductor device that emits light when current is passed
through it. Usually used as a status or warning indicator.
MIL
The three-letter acronym that stands for “Military” and precedes military specifications and
standards numbers (e.g., MIL-W-XXXX would indicate a wire specification and
MIL-STD-XXXX would indicate a standard).
P/N
Part Number – Refers to an ACR part number, unless otherwise noted.
PLUG
The term “Plug”, within the context of this document, refers to the male half of an electrical
connector.
RECEPTACLE
The term “Receptacle”, within the context of this document, refers to the female half of an
electrical connector.
RF
Radio Frequency – The range of electromagnetic radiation that constitutes the radio
spectrum and corresponds to the frequency of alternating current electrical signals used to
produce and detect radio waves.
RTCA
Radio Technical Commission for Aeronautics – Organization that makes recommendations
for airworthiness; refer to
http://www.rtca.org/aboutrtca.asp
RTV
A rubbery silicon-based adhesive typically used to prevent vibration problems and water
intrusion.
SAR
Search and Rescue
SCREEN ROOM
Refers to a room designed to block RF signals, such that the broadcast of an ELT placed in
the screen room cannot reach the SAR satellite system.
SERVICE LOOP
A length of wire or cable at the connection point, of sufficient length to allow a component
to be withdrawn from its mounting position and disconnected from its associated wiring.
TETHER
A cord or similar device that anchors something movable to a stationary point or anchors
two items together, such that they cannot become separated beyond the length of the
tether.
TSO
Technical Standard Order – A TSO is a minimum performance standard issued by the FAA
for specified materials, parts, and appliances used on civil aircraft.
UTC
Coordinated Universal Time – A time standard based on International Atomic Time. UTC is
the time system used in aviation and is often associated with Greenwich Mean Time (GMT)
and/or “Zulu” time.
VHF
Very High Frequency – The 30 MHz to 300 MHz radio frequency band.
VSWR
Voltage Standing Wave Ratio – The ratio of the amplitude of a partial standing wave at an
antinode (maximum) to the amplitude at an adjacent node (minimum), in an electrical
transmission line. An ideal transmission line would have a VSWR of 1:1.
