SYSTEM DESCRIPTION AND INSTALLATION MANUAL
HS--700 High Speed Data System
23--20--33
30 Aug 2002
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Page 2--1
SECTION 2
MECHANICAL INSTALLATION
1. Overview
A. General
(1) This section contains information on how and where to mount the HSU, CDM,
combiner, and splitter. Figure 2-1 shows the HSU dimensions. Figure 2-2 shows
mounting tray dimensions. Figure 2-3 shows the physical attributes of the CDM.
Figure 2-4 shows the dimensions and mounting hole dimensions of the RF
splitter/combiner.
B. Equipment and Materials
(1) See the applicable outline and installation diagram in this section for mounting
information.
2. Mechanical Installation Design
A. HS--700 HSU Provisions
(1) Mechanical installation data for the HS--700 HSU is shown in Figure 2-1. The HSU is
mounted in an ARINC 404A 1/4 ATR short , 2MCU chassis with one hold--down
hook. It can be installed inside the pressurized area, or outside (within the limits of
DO--160D specifications). It is important that the HSU is installed in a location where
its operational temperature specifications are met. The HSU is approved for
installation on jet engine aircraft, but not turboprops or helicopters. No special cooling
is required, but the airflow must not be blocked.
(2) The location of the mounting tray should allow the interface cabling to other units to
be as short as possible. The location must give protection against rain, condensation,
solvents, and hydraulic fluid. The mounting tray must be electrically bonded to the
aircraft frame by a low resistance path of less than 0.1 ohm. Mechanical installation
data for the mounting tray is shown in Figure 2-2.
B. CDM Provisions
(1) Mechanical installation data for the CDM is shown in Figure 2-3. The CDM is
designed for mounting into the slot in the HSU rear panel and acts as an integrated
part of the HSU. The CDM has the same installation requirements as the HSU.
(2) A stud on the CDM can be used to attach a tether between the CDM and the
mounting tray to make sure that the CDM stays with the aircraft in case the HSU
must be replaced.
C. RF Splitter/Combiner Provisions
(1) Mechanical installation data for the splitter/combiner is shown in Figure 2-4.