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not contain an altitude report.
* XPNDR (transponder) - The active transponder responds to
ATC interrogations. Mode C and Mode S altitude replies
contain altitude information.
IDENT Switch
When the ATC controller requests the airplane identifier, the
flight crew pushes the momentary IDENT switch. The
transponder adds a special position identification (SPI) pulse
to the interrogation reply for the next 18 seconds.
Altitude Source Switch
Use the two-position switch to set the source of altitude data for
the ATC transponder. When you set the switch to the number 1
position, ADIRU 1 supplies the altitude data. When you set the
switch to the number 2 position, ADIRU 2 supplies the altitude
data.
XPNDR FAIL Light
The XPNDR FAIL light comes on for these conditions:
* Transponder failure
* Antenna failure
* Control data failure.
* Altitude input failure.
ATC SYSTEM - ATC/TCAS CONTROL PANEL
EFFECTIVITY
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ATC SYSTEM - ATC/TCAS CONTROL PANEL
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General
The ATC ground station interrogates the ATC transponder with
a pulse-coded signal at a frequency of 1030 MHz.
The transponder responds with pulse-coded signals at a
frequency of 1090 MHz.
Characteristics
The transponder responds to air traffic control radar beacon
system (ATCRBS) mode A and mode C interrogations. The
transponder also responds to air traffic control and the TCAS
computer with the mode select (mode S) format.
The ATC transponder has a non-volatile flight-fault memory.
Front Panel Indications
The test switch starts a self-test.
The light emitting diode (LED) status indicators on the front
panel show for these conditions:
* LRU STATUS (green), if there are no LRU failures
* LRU STATUS (red), if there is an LRU failure
* ANTENNA TOP FAIL, if the top antenna fails
* ANTENNA BOT FAIL, if the bottom antenna fails
* ALTITUDE FAIL, if the altitude input from the ADIRU fails
* CONTROL FAIL, if the control panel input fails.
ATC SYSTEM - ATC TRANSPONDER
EFFECTIVITY
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ATC SYSTEM - ATC TRANSPONDER
EFFECTIVITY
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ATC SYSTEM - ATC TRANSPONDER
EFFECTIVITY
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Purpose
The ATC L-band blade antenna receives 1030 MHZ
interrogation signals from ATC ground stations and other
airplanes that have TCAS. The ATC transponder transmits the
reply signals through the L-band antenna.
Physical Description
The coaxial cable connector connects to the antenna. The
antenna has an O-ring moisture seal and attaches to the
airplane by four screws. The ATC and DME antennas are the
same and are interchangeable.
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EFFECTIVITY
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ATC SYSTEM - ATC ANTENNA
ATC SYSTEM - ATC ANTENNA
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General
The ATC coax switches connect the active ATC transponder to
　
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