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MAINTENANCE MANUAL
CAS-100 COLLISION AVOIDANCE SYSTEM
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3 Pressure Altitude
The pressure altitude data is supplied to TCAS from the transponder through XT
Coordination No. 1 and No. 2 ARINC 429 data bus (Data Word Label 203). The
Figure 1012 shows a sample Pressure Altitude screen. The line two contains the
altitude data from XT Coordination No. 1 pressure altitude data source. In this
example the data source is correct (altitude = 2400 ft.) and the plus sign shows
that the XPDR No. 1 is the active source. If that data were correct then line two
can show INVALID. The line three indications are almost the same except that
they are for XPDR No. 2.
Pressure Altitude Display Screen Example
Figure 1012
4 Roll
An example of a Roll display is shown in Figure 1013. The line two shows the
data from ARINC 429 Mag Heading/Attitude data bus (label 325). The (+)
indicated that data source is the active source. If the roll data from the 429 data
source is not correct, then line two can show INVALID. The line three shows the
data from a roll attitude synchro. In this case the data is incorrect.
Roll Display Screen Example
Figure 1013
