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EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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ATC SYSTEM - ANTENNA INTERFACE
ATC SYSTEM - ANTENNA INTERFACE
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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Power
ATC transponder 1 gets 115v ac power from standby bus 1. ATC
transponder 2 gets 115v ac power from transfer (xfr) bus 2. The
ATC/TCAS control panel gets 115v ac power from both standby
bus 1 and xfr bus 2.
Standby/On Discrete
The ATC/TCAS control panel sends a ground standby discrete
to the transponder that is not in use.
Identity Code
The flight crew sets the four digit identity code and it shows on
the ATC/TCAS control panel. Both transponders get the identity
code from the ATC/TCAS control panel.
Control Data
The ATC/TCAS control panel also sends control data to the
transponders. This control data does these functions:
* Permits mode C and mode S operation.
* Lets the transponder send the special position identification
(SPI) pulse or airplane identification code.
Air Data
The air data inertial reference units (ADIRU) send air data to the
ATC transponders.
ATC transponder 1 gets air data at AD input 1 from the left
ADIRU air data reference (ADR) bus 4. The left ADIRU also
supplies air data to the ATC 2 transponder from ADR bus 4.
ATC transponder 2 gets air data at AD input 1 from the right
ADIRU air data reference (ADR) bus 4. The right ADIRU also
supplies air data to the ATC 1 transponder from ADR bus 4.
ATC SYSTEM - POWER, IDENTITY, CONTROL, AND AIR DATA INTERFACES
EFFECTIVITY
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D633A101-SHZ1 Jun 10/2003
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-53-00-006
ATC SYSTEM - POWER, IDENTITY, CONTROL, AND AIR DATA INTERFACES
ATC SYSTEM - POWER, IDENTITY, CONTROL, AND AIR DATA INTERFACES
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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PSEU
The proximity switch electronics unit (PSEU) sends air/ground
discretes through the ATC/TCAS control panel to the
transponders.
These are the purposes of the air/ground discretes:
* Prevent ground tests of the ATC system in the air
* Prevent mode A and mode C replies on the ground
* Defines flight legs in the non-volatile memory.
Transponder Fail Discretes
Each transponder built-in test equipment (BITE) continually
monitors the equipment for failures. If the BITE detects a failure,
the transponder sends the fail discretes to the ATC/TCAS
control panel.
ATC SYSTEM - MAINTENANCE INTERFACE
EFFECTIVITY
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D633A101-SHZ1 Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-53-00-007
ATC SYSTEM - MAINTENANCE INTERFACE
ATC SYSTEM - MAINTENANCE INTERFACE
EFFECTIVITY
SHZ ALL 34-53-00
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D633A101-SHZ1 Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-53-00-007
Program Pins
Each ATC transponder has these program pins:
* Airplane mode S address
* Source destination identifier (SDI)
* Maximum true airspeed.
There are 24 airplane address program pins on each
transponder. A program switch module connects to the
program pins. The program switch module supplies the open
and ground connections necessary to make the 24-bit unique
airplane identification.
The SDI defines the transponder as the ATC 1 or ATC 2
transponder.
The maximum true airspeed pins define the maximum true
airspeed for the airplane. The transponder formats and sends
the maximum true airspeed to the TCAS computer.
Digital Data to TCAS
The active ATC transponder sends this data to the traffic alert
and collision avoidance system (TCAS) computer:
* The 24-bit mode S airplane identification. TCAS needs the
airplane mode S identification for maneuver coordination.
* Barometric altitude
* Maximum true airspeed
* TCAS coordination message data
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