Honeywell CAS-100 Maintenance Manual page 121

Table 19. CTA-81B Control Unit Controls and Indicators (cont)
Control/Indicator
(See Figure 11)
Function Selector Switch
(cont)
ATC 1 ON Position
ATC 1 TA Position
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MAINTENANCE MANUAL
CAS-100 COLLISION AVOIDANCE SYSTEM
In-Flight - Turns on the Mode S transponder to full on condition,
removes power from ATCRBS transponder, and puts the TCAS in
STANDBY mode (TCAS sensitivity level No. 1). The Mode S
transponder transmits squitters and replies to Mode S, ATCRBS
Mode C, and Mode A interrogations.
The Mode S transponder reply to the Mode C and Mode S
interrogations does not contain an altitude report if the ALT
SOURCE switch is set to the OFF position. The transponder reply
to Mode A interrogations contains the ATC transponder code
(normal Mode A reply). All the TCAS broadcast, surveillance, and
tracking functions are made unserviceable. The traffic display
screen is erased, but for a TCAS STBY annunciation.
On-the-Ground - Power is not applied to ATCRBS transponder.
The Mode S transponder squitters and replies fully to the Mode S
interrogations. Depending on the Mode S transponder strapping,
the transponder replies or does not reply to ATCRBS Mode C and
Mode A interrogations. The transponder reply to ATCRBS and
Mode S interrogations will not contain an altitude report if the ALT
SOURCE switch is set to the OFF position. The transponder reply
to Mode A interrogations contains the ATC transponder code.
TCAS is in STANDBY mode (sensitivity level No. 1). The traffic
display screen is erased but for a TCAS STBY annunciation.
In-Flight - Turns on the Mode S transponder to full on condition,
removes power from the ATCRBS transponder, and puts the TCAS
in TA ONLY mode (traffic advisory only mode).
Function
34-45-47
Page 92
1 Dec 2003