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ATC/MODE S TRANSPONDER SYSTEM -ANTENNA LOCATION
General
The top antenna is on top of the fuselage and the bottom antenna is bottom of the fuselage.
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ATC/MODE S TRANSPONDER SYSTEM -ANTENNA LOCATION
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ATC/MODE S TRANSPONDER SYSTEM -ANTENNA INTERFACE
General
When you select the left ATC/mode S transponder system, the ATC coax relays do not energize and the antennas connect to the left transponder. When you select the right ATC/mode S transponder system, the transponder panel sends a discrete to the ATC coax relays. This makes the top and bottom antennas connect to the right transponder.
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ATC/MODE S TRANSPONDER SYSTEM -ANTENNA INTERFACE
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777 AIRCRAFT MAINTENANCE MANUAL
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ATC/MODE S TRANSPONDER SYSTEM -POWER, IDENTITY, CONTROL, AND AIR DATA INTERFACES
Power
The left ATC/Mode S transponder gets 115v ac power from the ac standby bus. The right ATC/Mode S transponder gets 115v ac power from the right ac transfer bus. The dual transponder panel gets 115v ac power from the ac standby bus.
Standby/On Discrete
The transponder 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 transponder panel. Both transponders get the identity code from the transponder panel.
Control Data
The transponder panel also sends control data to the transponders. This control data does these functions:
*
Permit mode C altitude reporting
*
Permit the transponder to send the special position identification (SPI) pulse or airplane identification code.
EFFECTIVITY BEJ ALL
Air Data
BEJ 006-999
The air data inertial reference unit (ADIRU) and the secondary attitude air data reference unit (SAARU) send air data to the AIMS cabinets. ATC/Mode S transponders receive the air data from both AIMS cabinets.
BEJ 001-005
The air data inertial reference unit (ADIRU) and the secondary attitude air data reference unit (SAARU) send air data to the AIMS cabinets. Each ATC/Mode S transponder receives the air data from its on-side AIMS cabinet. The left transponder gets air data from the left AIMS cabinet. The right transponder gets air data from the right AIMS cabinet.
BEJ 006-999
The left transponder gets air data at ADC input 1 from the ADIRU general purpose (GP) bus 3 from left AIMS cabinet. Air data at ADC input 2 comes from the SAARU GP bus 3 from the right AIMS cabinet.
BEJ 001-005
The left transponder gets ADIRU air data from the general purpose (GP) bus 3 from left AIMS cabinet. The right transponder gets SAARU air data from the GP bus 3 of the right AIMS cabinet.
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ATC/MODE S TRANSPONDER SYSTEM -POWER, IDENTITY, CONTROL, AND AIR DATA INTERFACES
BEJ 001-005 (Continued)
BEJ 006-999
The right transponder gets air data at ADC input 1 from the SAARU GP bus 3 of the right AIMS cabinet. Air data at ADC input 2 comes from the ADIRU GP bus 3 from the left AIMS cabinet.
BEJ ALL
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ATC/MODE S TRANSPONDER SYSTEM -POWER, IDENTITY, CONTROL, AND AIR DATA INTERFACES
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ATC/MODE S TRANSPONDER SYSTEM -POWER, IDENTITY, CONTROL, AND AIR DATA INTERFACES
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BOEING PROPRIETARY -Copyright # -Unpublished Work -See title page for details.
ATC/MODE S TRANSPONDER SYSTEM -MAINTENANCE INTERFACE
Air/Ground
The air/ground discretes go through the transponder panel to the transponders.
The purpose of the air ground relay is to:
*
Prevent ground tests of the ATC system in the air
*
Define flight legs in the non-volatile memory if the CMCFs fail.
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