(i)  If INHIBITED shows above <MMR-L, <MMR-R, or <MMR-C: 1) Push the LSK that is adjacent to the test prompt. 2) Do the steps shown on the CDU. 3) Push the LSK that is adjacent to <RETURN to show the GROUND
 TESTS menu again.
 F.  Instrument Landing System Ground Test
 S 745-266
 (1)  Push the LSK that is adjacent to the applicable prompt (<MMR-L, <MMR-R, or <MMR-C).
 NOTE: IN PROGRESS shows during the test.
____
 (a)  When IN PROGRESS goes out of view, look for PASS or FAIL> adjacent to <MMR-R, <MMR-L, or <MMR-C.
 NOTE: If a PASS indication shows, no failures occurred
____
 during the test.

 (b)  If FAIL> shows: 1) Push the LSK that is adjacent to FAIL> to see the GROUND TEST MSG pages for the failure. 2) Push the NEXT PAGE key until you find all the GROUND TEST MSG pages. 3) Make a list of all CMCS messages, CMCS message numbers, and ATA numbers that show on the GROUND TEST MSG pages.
 4)  Go to the CMCS Message Index of the Fault Isolation Manual (FIM) to find the corrective action for each CMCS message.
 S 865-134
 (2)  Remove the electrical power if it is not necessary
 (Ref 24-22-00/201).

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A
747-400 MAINTENANCE MANUAL
 TASK 34-31-00-735-020
 4.  System Test - Instrument Landing System_______________________________________
 A. General
 (1)  
The system test uses a ramp test set to supply test signals, which test the condition of the instrument landing system. This task makes sure the ILS operates correctly.

 (2)  
This task contains these seven procedures:

 (a)  
Prepare for the System Test

 (b)  
Localizer Antenna Test

 (c)  
Localizer Audio Test

 (d)  
VOR/LOC Antenna Switching and EIU Discrete Interface Test

 (e)  
Glide Slope Track Antenna Test

 (f)  
Glide Slope Antenna switching and EIU Discrete Interface Test

 (g)  
EIU/ILS Bus Interface Test.

 B. Special Tools and Equipment
 (1)  
A27092-61, Proximity Sensor Actuator

 (2)  
11MIT65B04012 Actuator Lock - Nose Landing Gear Door (Recommended)

 (3)  
11MIT65B04012 Actuator Lock - Nose Landing Gear Door (Alternative)

 C. Standard Tools and Equipment
 (1)  VOR/ILS Ramp Test Set, Instrument Flight Research Type NAV-401L, or equivalent
 D. Consumable Materials
 (1)  G00118, Tape - Aluminum Foil, Mystic 7300
 E. References
 (1)  
AMM 22-10-00/501, Autopilot/Flight Director System

 (2)  
AMM 23-51-00/501, Flight Interphone System

 (3)  
AMM 24-22-00/201, Manual Control

 (4)  
AMM 31-61-00/501, Integrated Display System

 (5)  
AMM 32-00-30/201, Landing Gear Door Locks

 (6)  
AMM 32-61-02/201, Nose Gear Up Sensor

 (7)  
AMM 34-12-00/501, Air Data System

 (8)  
AMM 34-21-00/201, Inertial Reference System

 (9)  
AMM 34-21-00/501, Inertial Reference System

 (10)
 AMM 34-24-00/501, Standby Attitude Reference System

 (11)
 AMM 34-33-00/501, Radio Altimeter System

 (12)
 AMM 34-61-00/501, Flight Management Computer System

 (13)
 AMM 34-61-02/401, Control Display Unit

 F. Access
 (1)  Location Zones 115 Area Between the Nose Gear Well and the Fuselage, LH 117 Electrical and Electronics Compartment, LH 221 Control Cabin, LH 222 Control Cabin, RH
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