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A747-400MAINTENANCE MANUAL
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ARINC 429 Data Control Word Format
Figure 5

ITY PAR-FUNCTION (ODD)  MATRIX STATUS SIGN/  (3) 0-7 A4 A2 A1  (2)(6) 0-70-7 OCTAL CODES CODE SELECT C4 C2 C1B4 B2 B1  (0) 0-7 D4 D2 D1  OFF X-ON/ PULSE  SPARE  VHR IFR/  ALTI-SELECT SOURCE DATA TUDE  LECT IRS/ SE-INPUT FMC  IDENT.  REP. ALT.  SDI  (NOTE 2) CODE TRANSPONDER BEACON LABEL 
EXAMPLE BIT NO.  32
X
 31 0  0 30  MSD 110 29 28 27  1 1 26 25 24 0  10 23 22  0 21  000 LSD 20 19 18  17 0  16 0  15 0  14 0  13 0  12 X  11 X  0 10  0 9  0 1 1 1 0 0 0 0 8 7654321 
(NOTE 5) (NOTE 3)  (NOTE 4)  RESERVED  (NOTE 1) 

NOTE 1:

NOTE 2:  LABEL 043 (01110000) REPRESENTS THE BEACON TRANSPONDER CODE.
NOTE 3:  ALWAYS 00 (NORM) FOR THIS PANEL.
11
ALT. REP. ON
ALT. REP. OFF
12
IDENT. OFF
IDENT. ON
NOTE 4:  PANEL DISPLAY WOULD SHOW '3620'
NOTE 5:  BIT WILL SET TO A LOGIC 1 TO MAKE PARITY ODD.
A
747-400
MAINTENANCE MANUAL

RESERVED FOR 
FUTURE USE 
F1  C1  A1  2C  2A  4C  4A  1B  D1  2B  2D  B4  4D  2F  SP1 

TRANSPONDER REPLY PULSE FORMAT

F1C1A1C2A2C4A4 B1D1  F2 SP1

F1  F2MODE C ALT RPTG OFF

F1C1A1C2  B2 B4D4F2

SPI TRANSMITTED ONLY WHEN IDENT SWITCH IS PRESSED
TYPICAL TRANSPONDER REPLY PULSES
NOTE: ALL TIME IN . SECONDS.
ATC System Pulse Codes Figure 6

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A
747-400 FAULT ISOLATION/MAINT MANUAL
AIR TRAFFIC CONTROL (ATC) SYSTEM
COMPONENT  SHT 102 FIG.  QTY  ACCESS/AREA  AMM REFERENCE 
ANTENNA - BOTTOM ATC, B102 1  1  BOTTOM OF FUSELAGE, STA 570  34-53-03 
ANTENNA - TOP ATC, B101 1  1  TOP OF FUSELAGE, STA 610 34-53-03 
CIRCUIT BREAKER - 1  FLIGHT COMPARTMENT, P7 
ATC ANTENNA SW  1  7B23  * 
ATC LEFT 1  7B10  *
COMPUTER - (FIM 34-12-00/101) ATC RIGHT 1  7B22  *
 CENTER AIR DATA, B166 1 
LEFT AIR DATA, B163 1 
COMPUTER - (FIM 45-10-00/101) COMPUTER - (FIM 34-45-00/101) RIGHT AIR DATA, B164 TCAS, B8385  1 
LEFT CENTRAL MAINTENANCE, M7373 1 
INTERROGATOR - (FIM 34-55-00/101) RIGHT CENTRAL MAINTENANCE, M7374 1 
LEFT DME, B81 1 
MODULE - (FIM 31-61-00/101) RIGHT DME, B82 1 
CAPT SOURCE SELECT, M7991  1 
F/O SOURCE SELECT, M7995 1 
PANEL - ATC CONTROL, B37 1  1  FLIGHT COMPARTMENT, P8  34-53-01 
RELAY - (FIM 34-12-00/101) RELAY - (FIM 32-01-36/101) AIR/GND, R777 1 
CAPT ADC SOURCE SELECT, R7384  1 
F/O ADC SOURCE SELECT, R7385 1 
RELAY - BOTTOM ATC ANTENNA RF TRANSFER, B871 2  1  117Al, MAIN EQUIP CENTER, E2-3  34-53-04 
RELAY - TOP ATC ANTENNA RF TRANSFER, B872  2  1  117AL, MAIN EQUIP CENTER, E2-3  34-53-04 
TRANSPONDER - L ATC, B99 2  1  117AL, MAIN EQUIP CENTER, E2-3  34-53-02 
UNIT - (FIM 34-61-00/101) TRANSPONDER - R ATC, B100  2  1  117AL, MAIN EQUIP CENTER, E2-2  34-53-02 
CENTER EFIS/EICAS INTERFACE, M7352 1 
LEFT EFIS/EICAS INTERFACE, M7353  1 
RIGHT EFIS/EICAS INTERFACE, M7351 1 

* SEE THE WDM EQUIPMENT LIST
Air Traffic Control (ATC) System - Component Index
Figure 101

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