Ameri-King AK-451-ELT - Manual (Page 40)

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2.2.2.2.2 Rod Antenna Installation: (AK 451.017-2A)
The AK 451.017-2A Rod Antenna delivers optimum performance only when installed
correctly. To ensure adequate structural strength of the aircraft for associated air
loading during flight, use of a backing plate or doubler (not supplied) may be
required. Refer to FAA Advisory Circular 43.13-2B for guidance. It is the
responsibility of the installation agency to determine the appropriate and adequate
antenna installation. The AK 451.017-2A Rod Antenna is designed to provide ELT
transmissions from a single BNC Female coaxial connector.
Location:
The AK 451.017-2A 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.
Installation Preparation:
1. Prepare the surface for antenna installations in such a manner to ensure a ground
contact of less than 0.003Ω. If bare metal surfaces are needed for surface
preparation they should be treated with Alodine® 1200 (or similar application) to
eliminate aluminum oxidation. NOTE: The AK 451.017-2A Rod Antenna bonds
through the base plate, not through the mounting screws.
2. Use the AK 451.017-2A outline drawing on Fig. 7 to determine hole pattern and
drill size.
Type of aircraft:
The AK 451.017-2A Rod Antenna is designed for installation on fixed wing subsonic
aircraft with reciprocating or turbine engines and is rated for a maximum airspeed of
350 KTAS (Knots True Airspeed at 25,000 feet).
Installation:
1. Metal adapter plates are optional but they 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 structural
strength for associated air loading during flight. Refer to FAA Advisory Circular
43.13-2B for complete information.
3. Mount the antenna using four 100° countersink #8-32 stainless steel machine
screws and associated hardware. Tighten to 20” lbs max.