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747-400 FAULT ISOLATION/MAINT MANUAL 
NOSE RADOME SEE
Instrument Landing System - Component Location 
Figure 102 (Sheet 1)
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LEFT, RIGHT OR CENTER ILS RECEIVER, 
B620, B628 OR B7439
Instrument Landing System - Component Location 
Figure 102 (Sheet 2)
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L33757
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747-400 FAULT ISOLATION/MAINT MANUAL 
C/L DUAL G/S TRACK ANTENNA, B559 
FWD 
LEFT AFT NOSE GEAR DOOR 
C 
R DUAL G/S 
TRACK 
ANTENNA, B561
P7 PANEL 
FWD 
RIGHT AFT NOSE GEAR DOOR 
D 
FLT COMPT 
Instrument Landing System - Component Location 
Figure 102 (Sheet 3)
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 INSTRUMENT LANDING SYSTEM - ADJUSTMENT/TEST
___________________________________________
 1.  General_______
 A.  This subject has three tasks. The first task is an operational test of the instrument landing system (ILS). The second task is a ground test of the ILS. The third task is a system test of the ILS.
 TASK 34-31-00-715-001
 2.  Operational Test - Instrument Landing 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 audio control panel (ACP) to do the operational test.
 (2)  
This task contains these two procedures:
 (a)  
Prepare for the Operational Test
 (b)  
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 34-61-02/401, Control Display Unit
 C.  Access
 (1)  Location Zone
 221 Control Cabin, LH
 222 Control Cabin, RH
 D.  Preconditions
 S 865-259
 (1)  These conditions are necessary for this task:
 (a)  
Electrical Power on (AMM 24-22-00/201).
 (b)  
Integrated Display System (IDS), serviceable (AMM 31-61-00/501).
 (c)  
Flight Interphone System, serviceable (AMM 23-51-00/501).
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 (d)  Control Display Unit (CDU), installed (AMM 34-61-02/401).
 E.  Prepare for the Operational Test
 S 865-260
 (1)  Make sure these circuit breakers are closed:
 (a)  P7 Overhead Circuit Breaker Panel
 1) 7A6 NAV RADIO MMR L
 
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