Avidyne IFD540 Installation Manual page 40

The GPS antenna should be installed in a location that allows the
antenna to be level in normal cruise flight.
For multiple GPS installations, the antennas should not be mounted
in a straight line from front to rear of the aircraft along the
longitudinal axis on the aircraft to prevent simultaneous antenna
damage from lightning strikes.
Antennas should be installed 3" or more from the windshield.
3.3.1.1 Aircraft Lightning Zone
If installing an Avidyne GPS Antenna (Avidyne Part Number 200-00260-000), the GPS
antenna is qualified to be installed in aircraft lightning zone 2A as defined by SAE ARP5414A
and RTCA DO-160G. The No Installation Area can be determined using Figure 2. The
distance found by using Figure 2 defines a zone immediately aft of the nose of the aircraft, or
propeller in the case of single engine propeller driven aircraft, where the GPS antenna should
not be installed. Aircraft locations aft of the No Installation Area are acceptable to install the
GPS antenna. Figure 3 below shows an example of the No Installation Area.
Procedure:
1. Determine the Maximum Cruising Speed (V
aircraft. Note: Indicated Airspeed in knots (KIAS) must
be used in the table.
2. Locate the Airspeed for the aircraft on the Horizontal
Axis of the table. Draw a vertical line from the Airspeed
to the No Installation Area.
3. Draw a horizontal line from the No Installation Area,
found in Step 2, to the Vertical Axis on the chart.
600-00299-000
Figure 2: Distance to Aircraft Lightning Zone 2A
Page 40 of 198
IFD5XX Installation Manual
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