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1 Dec 2003
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MAINTENANCE MANUAL
CAS-100 COLLISION AVOIDANCE SYSTEM
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Table 18. CTA-81A Control Unit Controls and Indicators
(cont)
Control/Indicator
(See Figure 10)
Function
Function Selector Switch
(Cont.)
TA Position (TA ONLY Mode)
(Cont.)
In-Flight - Turns the Mode S transponder to the operation condition
and puts the TCAS in TA ONLY mode (traffic advisory only mode)
(TCAS sensitivity level No. 2). The Mode S transponder transmits
squitters and replies fully to Mode S, ATCRBS Mode C, and Mode
A interrogations. TCAS broadcasts and does all Mode S and
ATCRBS surveillance and tracking functions. TCAS gives traffic
displays for TA, proximity, and nonthreat category aircraft
(NOTE
2.
for exception)
. TCAS does not categorize or display one aircraft
as a RA threat symbol. TCAS gives the traffic advisory alerts, but
does not give resolution advisory alerts (for example, voice RA
alerts or RA indications on the traffic display are not supplied). A
TA ONLY annunciation comes into the view on the traffic display.
On-the-Ground - Mode S transponder squitters and replies to
Mode S interrogations. Depending on transponder strapping,
transponder replies fully or does not reply to ATCRBS Mode C and
Mode A interrogations. Depending on TCAS strapping, TCAS
goes into TA ONLY mode or STANDBY mode (traffic display
screen is erased except for a TCAS STBY mode annunciation
shown on the traffic display).
TA/RA Position
In-Flight - Turns on the Mode S transponder to the operation
condition. If own aircraft is above 500 feet AGL, TCAS goes into
sensitivity level No. 4 through No. 7 dependent on own aircraft
altitude (see Table 7). The Mode S transponder transmits squitters
and replies fully to Mode S and ATCRBS
