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BENDIX/KING KLN 90B
Rev 5, April/2003 10521I05.TDC Page 2-3
2.3.5 ANTENNA MECHANICAL INSTALLATION
2.3.5.1 General
To maintain good performance from the antenna system, do not wax or paint the
antenna.
2.3.5.2 Installation Procedure
A. Using the correct template for the antenna chosen, mark the mounting holes on
the aircraft fuselage.
B. Drill and/or punch the required holes.
C. Use a piece of fine sandpaper or emery cloth to sand the area on the fuselage
skin on which the doubler plate for the antenna is to be mounted and on the air-
craft skin under where the antenna will be mounted.
D. Apply Alumiprep No. 33, P/N 016-01127-0000, to both the inside and outside
areas of the fuselage and to the back of the doubler plate. Follow the directions
on the container to cleanse the metal of any left over residue.
E. Apply Alodine, P/N 016-01128-0000, to both locations following the directions
on the container. This is used to ensure good bonding of the antenna and to pre-
vent oxidation.
F. Refer to figure 2-5 for the KA 91 installation drawing or figure 2-8 for the KA 92
installation drawing and mount the antenna as shown. First rivet the doubler
plate in place. It is imperative that the doubler plate make a good electrical bond
with the inside of the aircraft skin and that the antenna itself be well bonded to
the aircraft.
G. When installing the KLN 90B antenna do not exceed 25 inch/lbs of torque on
the antenna mounting screws.
H. Apply white RTV sealant around base of installed antenna. Fill mounting screw
holes with RTV sealant (P/N 016-01129-0000 or equivalent).
2.3.6 ELECTRICAL INSTALLATION
2.3.6.1 General Information
The KLN 90B will operate with an input voltage from 11 to 33 VDC, but the front
panel lighting circuit must be wired for either +14 VDC, +28 VDC, +5 VDC, or 5
VAC depending upon the version of unit installed. Refer to the KLN 90B inter-
connect diagram for wiring details.
A. The installing facility will supply and fabricate all external cables. The required
connectors are supplied as part of the installation kit.
B. The length and routing of the external cables must be carefully planned before
attempting the actual installation. Avoid sharp bends or locating the cable near
aircraft control cables.
C. The KLN 90B and associated wiring must be kept at least a minimum of 3 ft.
from high noise sources and not routed with cables from high power sources to
insure optimum performance from the system.
D. Do not route the antenna cable near any cable used for a transmitting antenna.
Prior to installing the KLN 90B itself, a point to point continuity check of the wir-
ing harness should be done to verify proper wiring. The aircraft power input to
the unit should be made to insure that power is applied to only the specified
power pin(s).