User's Manual

SYSTEM DESCRIPTION AND INSTALLATION MANUAL
T
3
CAS/Part No.9005000
MECHANICAL INSTALLATION
1. General
This section contains information on how and where to mount each component of the T
3
CAS
system. For new installations, plan installation in two stages. First, determine the location of the
LRUs in the aircraft. Next, determine the length of RF and electrical interconnections for selected
locations.
NOTE:
The mounting surface of the antenna base plate has an Alodine-treated surface which
provides corrosion resistance. The Alodine application material does not provide any
electrical resistance or isolation. Do not sand or remove the Alodine material from the
surface. In addition, sanding this surface may damage the unit beyond repair.
2. Equipment and Materials
For new T
3
CAS installations, refer to Table 1-1 for mounting tray information. For all other
components, refer to the applicable Outline and Installation drawing in this section for mounting
information. The Outline and Installation drawings show connector and connector contact
pin/socket part number information, where applicable.
3. Mechanical Installation Design
NOTE:
To assure proper grounding of the T
3
CAS system, the aircraft surface to which
all mountings or units are attached must be clean bare metal. Mount to the
airframe with a resistance of 5 milliohms or less.
A. T
3
CAS Computer Unit Provisions
Mechanical installation data for the T
3
CAS Computer Unit (6-MCU) is shown in Figure 2-4
and for the T
3
CAS Computer Unit (4-MCU) is shown in Figure 2-5.
The computer unit can be mounted in any convenient location in the aircraft; however, it
must be located so as to maintain an antenna coaxial cable insertion loss of 2.5 ±0.5 dB
in accordance with DO-185. This is approximately within 50 feet (15.24 meters) of the
antenna unless low loss coaxial cable is used. Top and bottom coaxial delay timing
differences can be compensated for by use of the antenna delay program pins.
The T
3
CAS Computer Unit is mounted in an ARINC 600 6-MCU or 4-MCU mounting tray,
depending on the T
3
CAS unit part number. The 6-MCU computer unit requires external
cooling air in accordance with ARINC 600 to maintain the highest possible Mean Time
between Failures (MTBF). The 4-MCU computer unit utilizes a unit-mounted fan
(integrated fan) for cooling.
Pub. No. 8600200-001, Revision 004
34-45-29
2-1
04 Nov 2014
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