AUDIO CONTROL PANEL (ACP)

VOR Navigation System Component Location
Figure 1 (Sheet 3)

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747-400 MAINTENANCE MANUAL
NAV
EIU
SOURCE
SELECT
EICAS SELECT PANEL/FMC SWITCH
SWITCHES
H
IRS
CAPTAIN'S SOURCE SELECT MODULE
G

MINS  BARO BARO
FPV MTRS  FPV MTRS
RADIO BARO IN HPA DH MDA IN HPA RST STD RST STD
VOR APP  PLN MAP  40  80  160  APP VOR  MAP PLN  40  80  160 
VOR L  20  320  VOR R  VOR L  20  320  VOR R 
OFF  CTR  10  TFC  640  OFF  OFF  CTR  10  TFC  640  OFF 
ADF L  5  ADF R  ADF L  ADF R 
WXR  STA  WPT  ARPT  DATA  POS  TERR  WXR  STA  WPT  ARPT  DATA  POS 

CAPTAIN'S AND FIRST OFFICER'S CAPTAIN'S AND FIRST OFFICER'S
EFIS CONTROL PANEL EFIS CONTROL PANEL

I1  I2
AIRPLANES WITH PREDICTIVE WINDSHEAR
1
AIRPLANES WITHOUT PREDICTIVE WINDSHEAR
2
VOR Navigation System - Component Location
Figure 1 (Sheet 4)

A39316
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747-400
MAINTENANCE MANUAL

MEMORY CARD SLOT LCD
TEST
SWITCHES
TEST CONNECTOR
VOR/MKR RECEIVER

L33750
VOR Navigation System - Component Location
Figure 1 (Sheet 5)

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MAINTENANCE MANUAL

 3.  VOR/LOC Antenna
_______________
 A.  One dual-channel VOR/LOC antenna is used to supply VOR ground station rf signal to the left and right VOR/MKR receivers. The antenna also supplies localizer rf to the ILS receivers through the respective left and right VOR/LOC rf power dividers prior to the approach mode of operation during an ILS approach (Ref 34-31-00).
 B.  The VOR/LOC antenna is located on the vertical stabilizer tip.
 4.  VOR/LOC RF Power Divider
________________________
 A.  Two VOR/LOC rf power dividers are used to supply rf signals received by the VOR/LOC antenna to the VOR/MKR receivers and to the ILS receivers (Ref 34-31-00). The output of the left VOR/LOC rf power divider supplies signals to the left VOR/MKR receiver. The output of the right VOR/LOC rf power divider supplies signals to the right VOR/MKR receiver.
 B.  The left and right VOR/LOC rf power dividers are located in the E1 electronics equipment rack in the main equipment center. They are located at the left end of the No. 6 shelf.
 5.  VOR Navigation System Interfacing Systems
_________________________________________
 A.  The VOR navigation system interfaces with the following systems:
 (1)  
Flight Interphone System (Ref 23-51-00)

 (2)  
Integrated Display System (Ref 31-61-00)

 (3)  
Flight Management Computer System (Ref 34-61-00)

 B.  Flight Management Computer System (FMCS)
 (1)  
Components of the FMCS that interface with the VOR navigation system are the:

 (a)  
Control display unit

 (b)  
FMC select switch

 (2)  
Control Display Unit (CDU)

 (a)  
The CDU is used as an input/output device for various electronic systems. It can be used to manually tune the VOR/MKR receivers through the FMCs or as backup tuning when both FMCs have failed and to initiate system self-tests through the central maintenance computer (CMC).
　
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