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Mounting the GMA 245R with the front of the unit facing perpendicular to the cockpit (facing the left or
right side of the aircraft), whether vertically or horizontally mounted, may have reduced connectivity
depending on which side of the aircraft surrounding structures/equipment are located.
Mounting the GMA 245R with the face down can function well in locations where the face of the
GMA 245R is oriented towards the aircraft cockpit floor, with the area between the floor and the aircraft
panel open. Mounting the GMA 245R with the face up can work well depending on what structures/
equipment are located between the GMA 245R and the cockpit.
Mounting the GMA 245R with the front face of the unit facing forward may work in some installations,
but generally results in reduced Bluetooth performance.
Do not install the GMA 245R in a metal box or beneath a floor panel, as this will attenuate (decrease) the
Bluetooth signal. If the installation contains another device that provides a Bluetooth interface, mount the
devices apart from each other as much as possible (at minimum, leave a small gap between the devices) to
prevent signal interference.
2.7 Cabling and Wiring
Refer to the interconnect examples in
In some cases, a larger gauge wire such as AWG #18 or #20 may be needed for power connections. If
using AWG #18 barrel contacts, ensure that no two contacts are mounted directly adjacent to each other.
This minimizes the risk of contacts touching and shorting to adjacent pins and to ground.
Use wire and cable meeting the applicable aviation regulation. When routing wire and cable, observe the
following precautions:
•
Keep wire and cable as short and direct as possible
•
Avoid sharp bends
•
Avoid routing near power sources (e.g. 400 Hz generators, trim motors, etc) or near power of
fluorescent lighting
•
For Power and Ground use 2 individual wires for the units to the power source. Do not splice 2
wires to one at the unit for power and ground.
NOTE
Avoid installing the unit near heat sources. If this is not possible, ensure that additional
cooling is provided. Allow adequate space for installation of cables and connectors. The
installer will supply and fabricate all of the cables.
2.8 Cooling Air
The GMA 245 does not have provisions for attaching cooling air, however the thermal characteristics of
the installation should always be assessed. An undesirable thermal condition could be created due to the
unit's own internal power dissipation combined with restricted ventilation, or due to heat generated by
adjacent equipment. Limiting thermal build up, by means of fan or natural convection is always a good
practice and recommended to increase the product life.
190-01879-11
Rev. 6
Appendix C
for wire gauge guidance.
GMA 245/245R Installation Manual
Page 2-5
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