ARTEX AIRCRAFT SUPPLIES ME406, Description, Operation, Installation And Maintenance Manual, Page: 24 / 68

ARTEX AIRCRAFT SUPPLIES, INC. 570-1600
6) Apply a small, smooth fillet with RTV sealant around the periphery of the antenna
base to seal out moisture.
7) For maximum signal strength, the length of the antenna coax to the ELT should be as
short as possible (use of the standard 6-foot (1.8 M) coax is recommended when
possible).
2.4.1.5
Composite Aircraft Installation
Except for preparation instructions and installation of a ground plane, installation is the same.
Refer to AC 43.13 for complete information.
2.4.2
Rod Antenna – P/N 110-338
See Figure 22. Refer to AC 43.13 for guidance. It is the responsibility of the installation agency
to determine the appropriate and adequate antenna installation. To ensure adequate support
for associated air loading during flight, use of a backing plate or doubler (not supplied) may be
required. The Rod Antenna (P/N 110-338) connector is a single BNC female.
2.4.2.1
Location
The Rod Antenna must be mounted on the top of the aircraft to assure maximum ‘visibility’ of
satellites (406 MHz). The best location is the upper aft portion of the fuselage. It should be
mounted vertically and away from projections such as a propeller, tail surfaces, or the shadow
of larger antennas.
2.4.2.2
Installation Preparation
1) Prepare the surface for antenna installations in such a manner to ensure a ground
contact of less than 0.003
Ω . If bare metal surfaces are needed for surface
preparation they should be treated with Alodine
®
1200 (or similar application) to
eliminate aluminum oxidation.
2) Refer to Outline Drawing (P/N 110-338, page 55) for hole pattern and drill size.
2.4.2.3
Type of Aircraft
The Rod Antenna is designed for installation on fixed or rotor wing subsonic aircraft and is rated
for a maximum airspeed of 350 KTAS (Knots True Airspeed at 25,000 feet).
2.4.2.4
Installation
1) Metal adapter plates should be used if the curvature or compound radius of the
aircraft skin is such that antennas cannot be directly installed vertically with their
plates mounted flat to the aircraft outer surface.
2) Backing plates or doublers should be installed to ensure adequate strength for
associated air loading during flight. Refer to AC 43.13 for complete information.
3) Coat the contact surfaces with a corrosion inhibitor, e.g., Alodine
®
1200.
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