User's Manual Part 2

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.
4--78
The followin g common mode and differential mode inputs signals are accepted
by the T
2
CAS with the voltage ranges defined:
• (+) input common mode range --5.0 to +40.0 Vdc
• (--) input common mode range --2.5 to +2.5 Vdc
• Differential (+ to --) range --2.5 to +37.5 Vdc
NOTE: The maximum radio altitude input currently used in TCAS is +37.5 Vdc
for a metric system. The common mode ranges allow for a ±2.5 Vdc
ground voltage differential.
The minimum input impedance on each pin is 95k Ohms relative to ground. The
minimum input impedance for inputs which are connected to both TCAS and
TAWS/RWS will be one half the minimum number listed.
(5) Flight Path Angle
The T
2
CAS Digital Flight Path Angle input parameter is updated from an Inertial,
Flight Management or GPS source.
Inertial systems supported: ARINC 704 IRS, ARINC 705 AHRS, ARINC 738 ADIRS,
and other non-- ARINC standard interface.
FMC system supported: ARINC 702 Flight Management System and other
non-- ARINC standard interface.
GPS system supported: ARINC 743/743A.
The minimum External Sensor input accuracy accepted for Flight Path Angle is 0.3
Degrees.
(6) Current Aircraft W eight
The T
2
CAS updates the Current Aircraft Weight from either an FMS or a Weight and
Balance System source.
FMC system supported: ARINC 702 Flight Management System and other
non-- ARINC standard interface.
The minimum External Sensor input accuracy accepted for Current Aircraft Weight is
220 lbs. with 95% confidence.
(7) Aircraft Position Latitude/Longitude
The T
2
CAS Aircraft Position input parameter is updated from a GPS or FMS source.
The GPS source can be any one of the following: GPIRS or GPS. In addition, an IRS
source can be used, but only for short periods of time during GPS or FMS drop--outs
GPS system supported: ARINC 743/743A.