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SYSTEM DESCRIPTION, INSTALLATION, AND MAINTENANCE MANUAL
(3) Aligning the AMT-3800 HGA
Orientation of the AMT-3800 HGA is defined with respect to the principal axes
on the antenna. The principal axes are illustrated in Figure 3-7 on page 3-13.
The connector access cover on the radome is towards the aft of the aircraft. In
this orientation, the principal axes of the AMT-3800 HGA should be aligned with
those of the aircraft to within ± 0.25°. This is the default position for the
AMT-3800 HGA.
You can install the AMT-3900 HGA in a position that is slightly offset from the
default position.
offsets, the procedure for configuring the HDU is provided in the System
Setup Section 1F. This is the preferred method for applying any antenna
installation offsets. Optionally, software in the AMS-3800 can accommodate
an offset to correct beam steering. During the initial installation, set the
pitch, roll and rotation offset angles to within
EEPROM—MN-1242-10010 provides information about setting up the
AMT-3800 HGA.
(4) Installing the Antenna Interface Adapter
The installer must follow proper avionics procedures both when sealing the
mounting adapter to the fuselage and when sealing the AMT-3800 HGA to the
mounting adapter to avoid trapping water and corrosion. Use approved avionics
sealants and corrosion inhibitors.
The AMT-3800 HGA has two weeping/venting locations on the underside of the
unit. These venting locations are sealed, and no special precautions are
required to seal the antenna. The base of the antenna (except the grounding
areas) is painted.
(5) Installing the AMT-3800 HGA
Honeywell recommends using #10 stainless steel (CRES) fasteners with a
minimum ultimate tensile strength of 120,000 PSI for mounting hardware.
Torque requirements for mounting hardware should be calculated by the
installer for each unique installation.
To install the antenna assembly:
1. Remove the aft cover fasteners from the antenna assembly.
2. Carefully position and secure the antenna assembly on the mount, taking
care not to damage exposed cabling.
3. Connect the test harness (incorporating RS-422 maintenance lines) to the
HGA-J1.
4. Perform a software alignment using the AMT-3800 HGA MPU (optional if
installed in default orientation). Remove the test harness when the test is
complete.
5. Connect all cables to the antenna assembly.
6. Install the aft cover with #6 screws, 1242-K-0105-56 (SCREW PFH.138-32
X 9/16L CRES), and 14–16 in-lbs of torque.
© Honeywell International Inc. Do not copy without express permission of Honeywell.
Aspire-200
The HDU can be configured to compensate for installation
23-15-45
± 0.25°. The AMT-3800
Page 4-14
28 Feb 2018
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