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SYSTEM DESCRIPTION, INSTALLATION, AND MAINTENANCE MANUAL
3. Procedure for Antennas
A. General
(1) The following paragraphs describe general information when removing or installing
antennas.
NOTE: For all antennas not supplied by Honeywell, removal and installation should
be done according to installation instructions from the manufacturer.
B. Antenna Weather Protection
(1) Some antennas require gaskets and others have O--rings. When reinstalling
antennas, new gaskets or O--rings should be used.
(2) A weather sealant should be applied around the periphery of the antenna base to
prevent seepage of water and condensation and preclude corrosion. If a sealant or
aerodynamic smoother is used around the periphery of the antenna base, it should
be applied after the antenna has been bolted down. The sealant used should be
nonadhering so the antenna can be removed at a later time, if necessary. Chromatic
tape is recommended.
NOTE: When mounting antennas on a pressurized fuselage, a leveling and sealing
compound like Pro-Seal 870B--1/2 should be used between the entire
mounting surface of the antenna and the fuselage. Use of this compound, in
addition to the installation gasket, compensates for surface irregularities and
voids between the antenna and the fuselage. A mold releasing agent can be
used on the fuselage prior to installation to prevent the leveling compound
from adhering to the fuselage.
(3) To prevent water seepage on top mounted antennas, it can be necessary to apply
Silastic sealant (RTV--3145 or equivalent) to the mounting screw heads.
C. Antenna Hardware
(1) Clean the airframe at the antenna mounting area to remove any foreign material.
(2) Because of the insulation qualities of gaskets and leveling compounds, the mounting
screws are required to supply the electrical bonding between the antennas and the
aircraft (typically 15 milliohms or less is required). The technician doing the
reinstallation must be sure any hardware being reused is clean and free of corrosion.
If in doubt, use new hardware.
(3) Gaskets and O--rings deform during initial installation. While it is possible to reuse
gaskets and O--rings, it is highly recommended new gaskets or O--rings be used.
Honeywell International Inc. Do not copy without express permission of Honeywell.
MCS--4200/7200 Multi--Channel SATCOM System
23- -20- -35
Page 7--2
15 Jul 2006
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