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Av. Kit Install. Manual
190-00067-02 Rev. J
Page 13
The following installation accessories are required but not provided:
COMM ANTENNA: BROAD BAND 50 OHM VERTICALLY POLARIZED WITH COAXIAL CABLE.
HEADPHONES: 500 OHM NOMINAL IMPEDANCE
MICROPHONE: LOW IMPEDANCE CARBON OR DYNAMIC WITH TRANSISTORIZED PRE-AMP.
3.2 ANTENNA INSTALLATION
For the COMM antenna, follow the manufacturers instructions.
The remainder of this section applies to the GPS antenna. The GA 56 Antenna outline
and footprint dimensions are shown in Figures 3-1 and 3-2.
A. Using the backing plate as a template, mark the location of the mounting holes
and the through hole for coax cable. Drill or punch the holes.
B. The antenna installation must provide adequate support for the antenna considering
a maximum drag load of 5 lbs. for the GA 56 antennas (at subsonic speed). Install
a doubler plate to reinforce thin skinned aircraft. Observe guidelines for
acceptable installation practices as outlined in AC 43.13-2A.
C. Seal the antenna and gasket to the fuselage using a good quality electrical grade
sealant. Use caution to insure that the antenna connector is not contaminated
with sealant. Insure that the mounting screws are fully tightened and that the
antenna base is well seated against the gasket. CAUTION: Do not use construction
grade RTV sealant or sealants containing acetic acid. These sealants may damage
the electrical connections to the antenna. Use of these type sealants may void the
antenna warranty.
3.3 CABLE INSTALLATION
A. Route the coax cable to the rack location keeping in mind the recommendations
of Section 2. Secure the cable in accordance with good aviation practice.
B. Trim the coaxial cable to the desired length and install the BNC connector (330-
00087-00) per the cabling instructions on Figure 3-3. If the connector is provided
by the installer, follow the connector manufacturer's instructions for cable
preparation.
C. Contacts for the 37 and 26 pin connectors must be crimped into the individual
wires of the aircraft wiring harness. The following tables list contact part numbers
(for reference) and recommended crimp tools: