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* ATC transponder system failure data.
TCAS to Active Transponder
The TCAS computer sends this data to the active transponder:
* General TCAS operational data
* Coordination update data.
ATC SYSTEM - TCAS INTERFACE AND PROGRAM PINS
EFFECTIVITY
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ATC SYSTEM - TCAS INTERFACE AND PROGRAM PINS
ATC SYSTEM - TCAS INTERFACE AND PROGRAM PINS
EFFECTIVITY
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General
The ATC transponders, TCAS, and the DME interrogators
operate in the same frequency band. There is a suppression
interface between these units. This prevents damage to the
receiver circuits during a signal transmission. The suppression
circuits also prevent responses from onboard equipment.
The first unit to transmit sends a suppression pulse to a coax
tee. The coax tee divides the suppression pulse and sends it to
the different units, or to a different coax tee. This suppression
pulse prevents the operation of the receiver circuits in the other
units.
ATC SYSTEM - SUPPRESSION INTERFACE
EFFECTIVITY
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ATC SYSTEM - SUPPRESSION INTERFACE
EFFECTIVITY
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General
The dual ATC/TCAS control panel controls the ATC transponder
and the TCAS computer.
These are the ATC controls and displays on the ATC/TCAS
control panel:
* Transponder select switch
* Active system display
* Transponder code selectors
* Four digit identification code
* Transponder mode selector
* IDENT switch
* Altitiude source switch
* Fail light.
See THE TCAS section for more information on TCAS controls.
(SECTION 34-45)
Transponder Select Switch and Active System Display
The transponder select switch is a two-position switch used to
select ATC transponder 1 or ATC transponder 2 as the active
transponder. When the flight crew selects the 1 position, the
control panel sends a ground standby/on discrete to
transponder 2 only. Transponder 2 is in standby. Transponder
1 is active.
When the flight crew selects the 2 position, the control panel
sends an open standby/on discrete to transponder 2 to make it
active. A ground standby/on discrete goes to transponder 1 and
an antenna transfer discrete goes to the ATC coax switches.
This puts transponder 1 in standby and makes the relays
connect the ATC antennas to transponder 2.
The selected ATC system shows on the LCD active system
display.
Identification Code Display and Selection
The flight crew uses the code selectors to set the four digits of
the identification code. The four digits show on the liquid crystal
display (LCD). Codes are from 0000 to 7777, with 4096 different
selections.
CAUTION: DO NOT SELECT CODES 7500, 7600 OR 7700.
THESE CODES ARE USED ONLY FOR
EMERGENCIES.
Transponder Mode Selector
The transponder mode selector has several positions. These
are the functions that the ATC system uses:
* TEST - This push button on the top of the mode selector
starts an ATC transponder functional test.
ATC SYSTEM - ATC/TCAS CONTROL PANEL
EFFECTIVITY
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* STBY (standby) - A ground discrete goes to both
transponders. This ground discrete prevents operation of the
transponder, but does not prevent built-in-test-equipment
(BITE) functions.
* ALT RPTG OFF (altitude reporting off) - The active
transponder responds to ATC interrogations. The reply does
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