* SEE WDM EQUIPMENT LIST 
Radio Altimeter System - Component Index 
Figure 101
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A
747-400 
FAULT ISOLATION/MAINT MANUAL
P7 PANEL 
CAPTAIN'S, 
FIRST OFFICER'S EFIS 
CONTROL PANELS, 
M7354,M7364 (REF)
SEE A
FLIGHT COMPARTMENT 
DH (DECISION HEIGHT) SELECT 
DH RESET CONTROL 
BUTTON 
BAROMTRS
DH MDA  IN HPA 
RST  STD 
VOR APP  PLN MAP  40  80  160  
VOR L  20  320  VOR R  
OFF  CTR  10  640  OFF  
ADF L  ADF R  
WXR  STA  WPT  ARPT  DATA  POS 
CAPTAIN'S, FIRST OFFICER'S 
EFIS CONTROL PANELS, 
M7354,M7364 (REF)
A
RADIO ALTIMETER LEFT, CENTER, AND RIGHT R/T'S (CENTER EQUIPMENT CENTER, RACK, E9) 
RADIO ALTIMETER SEE SHT 2 LEFT, CENTER,
C 
AND RIGHT RECEIVE ANTENNAS B76,B546,B78 
SEE B 
RADIO ALTIMETER 
LEFT, CENTER, 
AND RIGHT 
TRANSMIT ANTENNAS 
B75,B545,B77
SEE B 
N-TYPE CONNECTOR RIGHT ANGLE N-TYPE ADAPTER 
ANTENNA 
CABLE
FAIRING PANEL 
SCREW  
(SCREW THREADS  TRANSMIT AND RECEIVE ANTENNAS,  
INTO NUTPLATE)  B75,B76,B77,B78,B545,B546  
(4 LOCATIONS)  (6 LOCATIONS) 
RADIO ALTIMETER ANTENNAS (EXAMPLE) 
B 
Radio Altimeter System - Component Location 
Figure 102 (Sheet 1)
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A 
747-400 FAULT ISOLATION/MAINT MANUAL 
RADIO ALTIMETER LEFT, CENTER, AND RIGHT RECEIVER/TRANSMITTERS, B73, B507, B74
LEFT, CENTER, RIGHT 
RADIO ALTIMETER 
RECEIVER/TRANSMITTERS, 
B73, B507, B74
Radio Altimeter System - Component Location 
Figure 102 (Sheet 2)
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A 
747-400 MAINTENANCE MANUAL
 RADIO ALTIMETER SYSTEM - MAINTENANCE PRACTICES
______________________________________________
 1.  General_______
 A.  This subject contains one task. The task is a radio altitude simulation test.
 TASK 34-33-00-722-307
 2.  Radio Altimeter System Altitude Simulation Test (Using Atlantis Ramp____________________________________________________________________ Test Set DRA-707)_________________
 A.  General
 (1)  
The DRA-707 Ramp Test Set is limited to tests and radio altitude simulation with Collins, TRT or Allidesignal radio altimeter R/Ts with 429 Bus digital output. One set of special test cable(s) is used only with TRT radio altimeter R/Ts. Another set of special test cable(s) is used only with Collins radio altimeter R/Ts. A thrid set of special test cable(s) is used only with Allidesignal Quantum radio altimeter extender boxes.
 
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