MAINTENANCE MANUAL
CAS-100 COLLISION AVOIDANCE SYSTEM
Page 101
1 Dec 2003
34-45-4
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Table 20. CTA-100A Control Unit Controls and Indicators
(cont)
Control/Indicator
(See Figure 12)
Function
Mode Select Switch
(cont)
TA/RA Position
(cont)
(NOTE 3.)
On-the-Ground - The Mode S transponder squitters and replies
fully to Mode S interrogations. Depending on transponder
strapping, the transponder replies fully or does not reply to
ATCRBS Mode C, Mode A, or Mode S interrogations. The TCAS
defaults to TA ONLY mode (TCAS sensitivity level No. 2) and
functions as shown for the TA position (on-the-ground) of the
Function Selector Switch in this table.
IDENT Pushbutton
The IDENT pushbutton is used to show the aircraft identification
symbol shown on the ATC display. The IDENT button has priority
over all other CTA-100A functions. Whenever the IDENT button is
operated, the CTA-100A must cancel the current task, transmit the
IDENT command, and default to the ATC code display mode.
ATC SELECT Pushbutton
The ATC SELECT pushbutton is used to set either Transponder
No. 1 or Transponder No. 2 in the TCAS system. Each operation
of the ATC SELECT pushbutton alternately sets the Transponder
No. 1 or Transponder No. 2. The indication of the set transponder
is given by annunciators indicating either a 1 or 2. The CTA-100A
controls the annunciatiors and transponder selection status.
ALT Select Pushbutton
The ALT 1/2 select pushbutton is used by the personnel to set the
No. 1 or No. 2 Mode S transponder altitude source input. Each
operation of the ALT 1/2 select pushbutton alternately sets the No.
1 or No. 2 input. The indication of the set transponder is given by
annunciators indicating either a 1 or 2. The CTA-100A software
controls the annunciators and altitude source input selection
status.
(NOTE 4.)
DISPLAY Screen
The CTA-100A controller has a display with eight alpha-numeric
characters. The display supplies white segments against a black
background. For an NVIS compatible version, green segments
against a black background are used. The display intensity is
controlled by an ambient light sensor to make sure
readability in all
ambient light conditions.
