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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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