User's Manual

Table Of Contents
SYSTEM DESCRIPTION AND INSTALLATION MANUAL
T
3
CAS/Part No.9005000
ALT TAG
RELATIVE
Indicates current selection on control panel for type of
traffic symbol altitude indication, RELATIVE or FLT
LVL. Default is RELATIVE if no switch is available on
control panel.
(d) RAD/ALT Status Page
Selection of code 0002 displays the RAD/ALT Status page, Figure 6-4.
This page displays the status of the selected radio altimeter interface to
the T
3
CAS.
Figure 6-4: Typical RAD/ALT Status Page
The first information line (line 3) of the RAD/ALT STATUS page indicates
which of the two radio altimeter ports is being used by the T
3
CAS
computer. The T
3
CAS computer attempts to use radio altimeter No.1
first. If it determines this input is invalid, it automatically switches to radio
altimeter No.2.
The current status of the two radio altimeter ports is displayed on lines 5
and 6. If a signal is valid, the radio altitude value is displayed in either
“FT” for English-type altimeters, or “M” for Metric-type altimeters.
If one of the radio altitude signals is determined to be invalid, the altitude
value is replaced by INACT. Radio altitude INACT indicates the radio
altimeter has failed, is not powered, or is not connected.
The radio altimeter input is determined to be invalid if, for an analog radio
altimeter input, 28 V dc valid is not present at T
3
CAS CU pin RMP-2K for
Radio Alt #1 or pin RMP-3C for Radio Alt #2, or for a digital radio
altimeter input, the SSM of the radio altimeter output indicates not valid
or no data is present on the digital bus.
Pub. No. 8600200-001, Revision 004
34-45-29
6-21
04 Nov2014
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