(2)  
The receive and transmit antennas are installed on the bottom of the fuselage. The three transmit antennas are located side-by-side at body station 893. The three receive antennas are located side-by-side at station 933.

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 34-33-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

DATA TO CDU'S XMIT
RECEIVE(FROM
429 BUS LINES MIXER ANT
BAND
ANT BUS NO.2)
PASS XMTR C RAB
115 VAC
FILTER
PRIMARY
RA BITE (HEIGHT)  L RA (HEIGHT)
BUS 2PWR INPUT
TEST INHIBIT (FROM BUS NO. 2)
R RA C
LEFT RAD ALTM
300 FT
SYS SELECT(HEIGHT)
P7 PANEL
DELAY
L RA (HEIGHT)
RA AID 57 FTL RAGPWS CMPTR (E1-4)
(FROM BUS NO. 1)
ALTITUDE
BUS 1429 BUS
RA TEST/BACKUPL-CMC (HEIGHT)
PROCESSOR ALTITUDE
CONTROL DATA
DH SET CMNDSDATALEFT FLIGHT CONTROL
ARINC DMU (E1-3)
LINES RA AND BITE DATACMPTR (L-FCC) (E1-1)
429 BUS LINES TEST
429  L RA (HEIGHT)
ARINC
BITE DATA
CMD BUS 2 429 BUS LINES
XMTR (FROM BUS 2)R-CMC FAULT
429 BUS 429
RCVR
L R/TR RA (HEIGHT)SUM WORD BITE/
DATA(FROM BUS NO. 2)
A
300 FT
MAINT
LINES 429 BUS
DELAY
RA BITEMODULARIZED AVIONICS,
TEST+5V DC
1
TEST INHIBIT AND WARNING ELEX ASSYLEFT CONTROL
CMD
(MAWEA) (E1-2)DISPLAY UNIT (L-CDU)
AIR/GND ANT FAIL
(R)
C RA (HEIGHT)DISCRETE
(FROM BUS NO. 1)CMPTR (L-CMC) (E1-4)
LEFT CENTRAL MAINT
P
RA BITE L, C, AUTO, OR R
CENTER FLIGHT
IND FAIL
(R)
MR
TEST INHIBIT  (EIU) DATA SELECT
CONTROL CMPTR
AIR/GND RELAY
O O (INOP)
TEST R RA (HEIGHT)(C-FCC) (E1-3)
NC
CAPTAIN'S EIU SOURCE
R7365 (PRI) (P415)PASS (FROM BUS NO. 1)
(G)
IE
SELECT SWITCHAIR/GND RELAY
T S LRU
RIGHT FLIGHT CONTROL(P1 PANEL)OPERATIONO S STATUS CMPTR (R-FCC) (E1-4)
FAIL
(R)
R983 (ALT) (P415) FAULT
RO
MONITOR
R
L-EIU
STATUS
BUS 2 LCRT
OUTPUT DATA CIRCUITS MPLX RA DATA
INDICATORS 2
RA DATA
RA DATA
(NOT DISPLAY:FAULTPROVIDEDC-EIU
FAULT
FAULT DH AND
BUS 2 C
429 BUS LINES SUMMARY IN SOMERA DATA
SUMMARY
MEMORY RA VALUES,
RA DATAUNITS)
RA TEST/  WORD WORD DH ALERT,BUS 2 R
BACKUP DH  429 BUS 429 BUS LINES AND DH/
LEFT RADIO ALTIMETER RCVR/XMTR (R/T) (E-9)
CENTER CONTROL RA DATA
SET CMNDS RA FAIL
R-EIU
DISPLAY UNIT (C-CDU) RIGHT CENTRAL MAINT RECEIVE ANT FLAGS
XMIT ANT
CMPTR (R-CMC) (E1-4)
RA DATA115 VAC
LEFT EFIS/EICAS
INTERFACE UNITBUS 1
CAPTAIN'S PRIMARYCTR RAD ALTM
(L-EIU) (E2-6)
FLIGHT DISPLAY (PFD)115 VAC
(P1)
C R/T
BUS 2 L MPLX RA TEST/RIGHT RAD ALTM
BUS 1BITE/MAINT RA DATA
(SAME AS L-RA R/T) RA AND
RA DATA L, C, AUTO, OR R
TEST CMD
BACKUP DHBITE DATA (EIU) DATA SELECT
P7 PANEL BUS 2 C FAULT
SET CMNDS
429 BUS  BUS 1 RA429 BUS LINES
RA DATASUMMARY
AIR/GND RELAY
429 BUS LINES F/O'S EIU SOURCE
WORD
BUS 2 R
AIR/GNDSELECT SWITCH
BUS 2 RA
DH SETR769 (PRI) (P415) 429 BUS LINES
RA DATA
DISCRETE (P3 PANEL)
CONTROL/DH AIR/GND RELAY
1
CENTER RADIO ALTIMETER RCVR/XMTR (R/T)
RESET (RST)
CENTER EFIS/EICASR226 (ALT) (P415)
CRT
(E-9)  B
INTERFACE UNIT L-EIU_______DISPLAY:
RIGHT CONTROL
DH MDA
(C-EIU) (E2-6)
DH CONTROLRA DATADH AND
RST
DISPLAY UNIT (R-CDU) RA VALUES,
DH CONTROL C-EIU
1INHIBITS RA SELF-TEST DH ALERT,USING CDU WHILE AIRBORNE.
BUS 2 L RA DATA
RECEIVE ANT XMIT ANT
AND DH/REF CHAPTER 31-61
RA DATAR-EIU
RA FAIL INTERGRATED DISPLAY
MPLX RA DATA
BUS 2 C RA DATA FLAGS CAPT EFIS CTL PNL R R/TRA DATA
SYSTEM FOR OPERATION OF RA AND
(LEFT GLARESHIELD)F/O'S PRIMARY FLIGHT
429 BUS LINES
BITE/MAINT (SAME AS L-RA R/T)
CDU, CMC, EFIS AND BITE DATA BUS 2 R
AIR/GND RELAY DISPLAY (PFD) (P3)
DH MDA
TEST CMD
BUS 1 RA  FAULT SUMMARY
EICAS CONTROL PANELS429 BUS LINES RA DATA
RST
WORD
　
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