User's Manual Part 1

T
2
CAS / Part No. 9000000
SYSTEM DESCRIPTION AND INSTALLATION MANUAL
34-43-20
15 Feb 2003
Use or disclosure of information on this page is subject to the restrictions in the proprietary notice of this document.
2--2
The TT--950/952 T
2
CAS Computer Unit is mounted in an ARINC 600 6--MCU mounting
tray. The computer unit requires external cooling air in accordance with ARINC 600 or
ARINC 404 to maintain the highest possible Mean Time Between Failures (MTBF). In
those installations where this is not available, a mounting tray with an integral fan is
required.
The TT--951 T
2
CAS computer unit is mounted in an ARINC 600 4-- MCU mounting tray.
This unit contains an internal temperature controlled fan, so it does not require any
external cooling.
The T
2
CAS computer tray connector is RADIALL part number NSXN3P357X0001 (other
Brands are available, but the RADIALL is preferred). This tray connector does not come
with contacts so approximately 150 each RADIALL part number 620-- 200, 22 gauge pins
will be needed as well.
The required contacts for the LBP insert depend on if the computer is to be powered with
+28 Vdc or 115 Vac and if a 115 Vac cooling fan will be connected when the computer is
powered with 115 Vac. Note that there is no output pins to support a +28 Vdc cooling fan.
B. Airplane Personality Module Provisions
Reference Figure 2-- 5 for the mechanical installations of the ACSS T
2
CAS APM. The
APM can be mounted to existing aircraft structure or can be mounted to the ACSS APM
mounting bracket that is secured to the aft side of the T
2
CAS computer tray connector,
reference Figure 2-- 5 (Sheet 2). If the Customer specifies the ACSS APM mounting
bracket, an APM bracket sub kit will be provided for the Customer’s T
2
CAS installations.
C. Antenna Provisions
The T
2
CAS TCAS top directional antenna should, ideally, be the most forward antenna on
the top of the aircraft and should be located as close to the longitudinal centerline as
possible. See Figure 2--10. A 5--degree tilt angle is allowed laterally, with 2--degree
positive and 5--degree negative tilt angles allowed longitudinally. See Figure 2--11.
If a bottom directional antenna is used, it should also be the most forward antenna on the
fuselage bottom. Tilt angle allowances are the same as on the top antenna. A bottom
omnidirectional antenna need not be the most forward antenna, but it should be
separated by at least 20--inches from any other L--band antenna.
Since the bottom antenna may be either a directional (standard) or an omnidirectional
(optional) antenna, dual notation is shown in the wiring diagram. Only one coax cable is
needed for an omnidirectional antenna installation.
(1) Directional Antenna Installation
The top directional antenna mounting and installation data is given in Figure 2--12.
Figure 2-- 12 contains the maximum radius dimensions for the various curved antenna
base part number units, the number of aircraft mounting holes and the length of the
connector extension for the various part number units. The antenna must be
electrically bonded (less than 5.0 milliohms bonding resistance) to the airframe to
provide a ground plane for the antenna elements.