Ameri-King AK-451-ELT - Manual (Page 44)

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Installation:
1.
Mounting the Blade antenna using #10-32 SS machine screws and associated
hardware and torque to 20 in-lbs.
2.
For BNC connector, drill a 0.6250” (5/8”) diameter hole.
3. The most important in installing Blade antenna is the electrical bonding
between the base plate antenna and the aircraft skin (metal-to-metal) rather
than thru the mounting screws as some other antennas.
4.
A layer of anti-corrosion bonding grease should be applied between the aircraft
skin and the base of the antenna.
5.
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.
6.
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.
7.
Remove the 1/2-28 hex nut and external tooth lock washer from the base of the
antenna. Insert antenna connector through mounting hole, make sure the "O"
ring remains in the base of the antenna connector flange groove and that the
connector has sufficient clearance through the aircraft skin. To mount the
antenna, place the lock washer and the hex nut on the inside of the aircraft and
sandwich the aircraft skin between the base of the antenna and lock washer
followed by the hex unit. Tighten the hex nut to between 25 to 30 in-lbs.
8.
Apply a small, smooth fillet with RTV sealant around the periphery of the
antenna base to seal of moisture.
9.
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 coax is recommended when
possible).