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The ground station uses a primary surveillance radar (PSR) to get radar returns from airplanes within the radar range. To make a communication link with the airplanes in the radar range, the ground station uses a secondary surveillance radar (SSR) to interrogate the ATC/Mode S transponder. The ground station transmits a side lobe suppression signal to inhibit close ATC replies that come from a SSR side lobe transmission.
On the ground radar display, the ATC operator sees the radar returns, altitude, and a four digit airplane identifier.
The ATC/Mode S transponder also replies to mode S interrogations from the traffic alert and collision avoidance systems (TCAS) of other airplanes.
Abbreviations and Acronymns
*
ABS -absolute

*
ABV -above

*
ADIRS -air data inertial reference system

*
AIMS -airplane information management system

*
ALT -altitude

*
ant -antenna

EFFECTIVITY
BEJ ALL

*
ATC -air traffic control

*
ATCRBS -air traffic control radio beacon system

*
BITE -built-in test equipment

*
BLW -below

*
CMCF -central maintenance computing function

*
CMCS -central maintenance computing system

*
coax -coaxial

*
CPU -central processing unit

*
gnd -ground

*
I/O -input/output

*
ident -identification

*
INS -instrument

*
LED -light emitting diode

*
MAT -maintenance access terminal

*
MAX -maximum

*
PSR -primary surveillance radar

*
RA -resolution advisory

*
REL -relative

*
RF -radio frequency

*
RPTG -reporting

*
SDI -source destination identifier

*
SLS -side lobe suppression

*
SSR -secondary surveillance radar

*
SPI -special purpose identification

*
STBY -standby

*
sw -switch

*
TA -traffic advisory

*
TAS -true air speed

*
TCAS -traffic alert and collision avoidance system

*
tpr -transponder

*
XFR -transfer

*
xpdr -transponder

 

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777 AIRCRAFT MAINTENANCE MANUAL

AIR TRAFFIC CONTROL/MODE S TRANSPONDER SYSTEM
* xpndr -transponder
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AIR TRAFFIC CONTROL/MODE S TRANSPONDER SYSTEM

EFFECTIVITY BEJ ALL  34-53-00 
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D633W101-BEJ  Jan 05/2002 

ATC/MODE S TRANSPONDER SYSTEM -GENERAL DESCRIPTION

General
When a ground station or a TCAS computer from another airplane interrogates the ATC/Mode S transponder system, the transponder transmits a pulse-coded reply signal. The reply signal identifies, and shows the altitude of the airplane.
General Description
The components of the ATC system are:
*
Top antenna

*
Bottom antenna

*
ATC coaxial relay top

*
ATC coaxial relay bottom

*
Transponder panel

*
Two ATC/Mode S transponders

*
Two program switch modules.

The two antennas supply transmit and receive signals to the ATC/Mode S transponder through the ATC coax relays.
The transponder panel sends identification and control data to the transponders and control to the ATC coax relays.
The AIMS cabinets supply altitude and central maintenance computing function (CMCF) data to the ATC/Mode S transponders.
The ATC/Mode S transponders have interface with the TCAS computer.
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ATC/MODE S TRANSPONDER SYSTEM -GENERAL DESCRIPTION

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D633W101-BEJ  Jan 05/2002 

ATC/MODE S TRANSPONDER SYSTEM -COMPONENT LOCATIONS

Flight Deck
The transponder panel is on the P8 aft aisle stand.
Main Equipment Center
These are the ATC/Mode S transponder system components in the main equipment center:
*
Left ATC/Mode S transponder

*
Right ATC/Mode S transponder

*
DME/ATC/TCAS suppression splitter

*
Left program switch module

*
Right program switch module

*
Top ATC coax relay

*
Bottom ATC coax relay.

EFFECTIVITY BEJ ALL  34-53-00 
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ATC/MODE S TRANSPONDER SYSTEM -COMPONENT LOCATIONS
　
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