* SEE THE WDM EQUIPMENT LIST
VOR Navigation System - Component Index
Figure 101

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747-400 FAULT ISOLATION/MAINT MANUAL
VERTICAL
STABILIZER TIP (REF)

SEEA

FWD
P7 PANEL
VOR/LOCANTENNA, B67
FWD
VERTICAL STABILIZER TIP (REF)
A

VOR Navigation System - Component Location
Figure 102 (Sheet 1)

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747-400 FAULT ISOLATION/MAINT MANUAL

VOR Navigation System - Component Location
Figure 102 (Sheet 2)

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L33748
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747-400 MAINTENANCE MANUAL
 VOR NAVIGATION SYSTEM - ADJUSTMENT/TEST
_______________________________________
 1.  General_______
 A.  This subject has three tasks. The first task is an operational test of the VOR navigation system. The second task is a ground test of the VOR navigation system. The third task is a system test of the VOR navigation system.
 TASK 34-51-00-715-001
 2.  Operational Test - VOR Navigation System________________________________________
 A.  General
 (1)  
The operational test does not use external test equipment and thus it can do a system check quickly. This task uses the local VOR station and the audio control panel (ACP) to do the operational test.

 (2)  
This task contains these three procedures:

 (a)  
Prepare for the Operational Test

 (b)  
Reception Test

 (c)  
Audio Test.

 B.  References
 (1)  
AMM 23-51-00/501, Flight Interphone System

 (2)  
AMM 24-22-00/201, Manual Control

 (3)  
AMM 31-61-00/501, Integrated Display System

 (4)  
AMM 34-21-00/201, Inertial Reference System

 (5)  
AMM 34-21-00/501, Inertial Reference System

 (6)  
AMM 34-61-02/401, Control Display Unit

 C.  Access
 (1)  Location Zones
 221 Control Cabin, LH
 222 Control Cabin, RH

 D.  Preconditions
 S 865-132
 (1)  These conditions are necessary for this task:
 (a)  Electrical Power on (AMM 24-22-00/201).
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747-400 MAINTENANCE MANUAL
 (b)  
Integrated Display System (IDS), serviceable
 (AMM 31-61-00/501).

 (c)  
Flight Interphone System, serviceable (AMM 23-51-00/501).

 (d)  
Inertial Reference System (IRS), serviceable
 (AMM/34-21-00/501).

 (e)  
Control Display Unit (CDU), installed (AMM 34-61-02/401).

 E.  Prepare for the Operational Test
 S 865-114
 (1)  Do the prepare for the operational test:
 (a)  
Make sure the inertial reference system (IRS) is aligned in the NAV mode (Ref 34-21-00/201).

 (b)  
Make sure these circuit breakers are closed:
　
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