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the top and bottom ATC antennas.
These are the electrical connector inputs:
* ATC antenna switch circuit breaker
* ATC/TCAS control panel.
The ATC coax switches supply an RF interface for the ATC
system interrogation and reply signals. These are the
connectors:
* ATC transponder 1 connector
* ATC antenna connector
* ATC transponder 2 connector.
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ATC Control Panel
The ATC/TCAS control panel controls the operation of the ATC
transponders.
The microprocessor in the control panel gets inputs from these:
* Code selectors
* IDENT switch
* Mode selector.
The microprocessor changes these inputs into ARINC 429
digital data. The ATC control panel sends this data on an ARINC
429 data bus to the selected transponder:
* The identity code the flight crew selects to reply to
interrogations
* Digital discretes for the position of the IDENT switch
* Digital discretes for ALT RPTG OFF or XPNDR mode
* Digital discrete for TEST.
The XPNDR 1-2 switch selects one transponder for operation.
The selected transponder receives an open discrete from the
control panel. A ground discrete goes from the panel to the
other transponder to put it in the standby mode. This discrete
also goes to the ATC antenna coax switches to connect the two
ATC antennas to the selected transponder.
The STBY position on the mode selector sets the selected
transponder to standby mode.
Air/Ground Input
The transponder receives an air/ground discrete from the
proximity switch electronics unit (PSEU). The CPU uses the air/
ground discrete to count flight segments in the fault history nonvolatile
memory. This discrete also prevents mode A and mode
C replies when the airplane is on the ground.
ATC Transponder Inputs
The transponder has an input/output (I/O) that has an interface
with the ARINC 429 data and analog discretes from the control
panel.
Control Inputs
The digital data bus from the control panel has three digital
discretes. One shows if the mode selector on the panel is in the
ALT RPTG OFF (altitude reporting off) position. If it is, the CPU
does not permit the transponder to make a mode C reply or to
give altitude information in a mode S reply.
The second digital discrete from the control panel shows the
position of the IDENT switch. The pilot momentarily pushes the
IDENT switch at the request of the ATC ground station. When
this happens, the transponder sends a special position
identification (SPI) pulse at the end of every normal mode A
reply. It continues for 18 seconds. The SPI causes the airplane
to be highlighted on the air traffic controller’s radar screen.
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The third digital discrete from the control panel shows if TEST is
selected. If it is, the transponder starts a functional self-test.
Altitude Inputs
The air data inertial reference units (ADIRUs) send barometric
altitude to each transponder. Each transponder uses only one
ADIRU altitude input. Set the altitude source switch on the
control panel to 1 to use input 1, or 2 to use input 2.
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