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A
747-400
MAINTENANCE MANUAL

ADF System - Component Location
Figure 1 (Sheet 1)

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747-400 
MAINTENANCE MANUAL 
RIGHT ADF ANTENNALEFT ADF ANTENNA 
(STA 1300)  (STA 1340) 
SEE  F  SEE  F 

RIGHT ADF
RECEIVER

SEE GE9 RACK
HATCHLEFT ADF
CENTER EQUIPMENT CENTER (E6,E9) RECEIVER
E6 RACKSEE E SEE G
FWD 
ANTENNA SENSE  LOOP ANTENNAS  CENTER EQUIPMENT CENTER E 
ASSEMBLY ELECTRONICS 
(EXAMPLE) CAPTIVE MOUNTING SCREW 
FWD  ADF ANTENNA O-RING  ELECTRICAL CONNECTOR 
F 

ADF System - Component Location
Figure 1 (Sheet 2)

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A38619
A
747-400
MAINTENANCE MANUAL

ADF RECEIVER

ADF System - Component Location
Figure 1 (Sheet 3)

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L33413
A

FMC MASTER SWITCH RELAY #1
LEFT CONTROL
DISPLAY UNIT

LEFT
FLIGHT
MANAGE-MENT
COMPUTER

AIR/
GROUND
RELAY

FMC
LR
CENTRAL MAINT-ENANCEFMC MASTER
COMPUTER
SWITCH
AIR/
GROUND
RELAY

RIGHT
FLIGHT
MANAGE-MENT
COMPUTER

FMC
MASTER
SWITCH
RELAY
#2

RIGHT CONTROL
DISPLAY UNIT

747-400 MAINTENANCE MANUAL
LEFT
ADF
ANTENNA

LEFT
ADF
RECEIVER

AUDIO
MANAGE-MENT
UNIT

RIGHT
ADF
RECEIVER

MIC MIC MIC MIC MIC MIC CALL CALL CALL CALL CALL CALL
LCR
FLT CAB PA
VHF VHF VHF
MIC MIC MIC MIC R/T CALL CALL CALL CALL
L R INOP HF
SAT
INT SPKR
VORRLADF B CRMKR L
V
R
APP L
R
RIGHT ADF ANTENNA AUDIO CONTROL PANELS
ADF System Block Diagram Figure 2
EFIS/
EICAS
INTER-FACE
UNITS

GS345TAS351  MHDG 168  ILS L 110.10 
350`/15  CRS 135 
DME 13.5 

ADF L
ADF R YKM ELN DME35.1 DME28.5
NAVIGATION DISPLAYS
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747-400 MAINTENANCE MANUAL
 (3)  The front panel of the ADF receiver contains a liquid crystal display (LCD) and two TEST pushbutton switches. The LCD is used as a fault display and user interface for test and troubleshooting.
 B. ADF Antenna
 (1)  
The L ADF and R ADF antennas are located on the top centerline of the airplane at station 1300 and 1340, respectively (Fig. 1).

 (2)  
The ADF antenna is a fixed integrated design and is comprised of one nondirectional sense and two directional loop antennas. They are enclosed in a tear-drop shaped synthetic shell. This shell also contains three preamplifiers and three transformers. They are mounted on the antenna electronic assembly.
　
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