Figure 3-26. Example Bracket Antenna Mounting Under Glareshield - Garmin GDU 37X Installation Manual

3.6.2 Considerations for Non-Structural Mounting
External mounting of the antenna is preferred, although the antenna can be mounted inside the aircraft.
When mounted internally, the antenna does not have to be aligned with the aircraft forward direction, but
should be equal to the aircraft typical cruise attitude.
There should be a solid mechanical base in the mounting area for the antenna, and existing surfaces or
brackets may be used with the doubler plate. Alternately, non-structural brackets may be fabricated in the
field as necessary to mount the antenna. Brackets should be made of minimum 0.032" thickness aluminum
and should span as short a distance as possible.
Some fabric aircraft include aluminum paste in the fabric finishing process, often referred to as "silver
coats". Presence of thick fabric and/or heavy "silver coats" may degrade the signal strength of the antenna.
3.6.3 Non-structural Installation to Glareshield
Figure 3-26 shows an example of a bracket created to support an antenna mounted on the underside of the
glare shield. Figure 3-27
bracket assembly shown in Figure 3-26.

Figure 3-26. Example Bracket Antenna Mounting Under Glareshield

190-01054-01
Rev. D
shows the non-structural mounting of the antenna under the glareshield, with the
GDU 37X Installation Manual
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