(b)  
EFIS Discrete Status Tests

 (c)  
IRS Transfer Switch and MCP Course Select Tests

 (d)  
VHF Navigation Transfer Switching Test

 B. References
 (1)  
AMM 21-58-02/501, EFIS Cooling System

 (2)  
AMM 22-11-01/501, Digital Flight Control System

 (3)  
AMM 22-31-00/501, Autothrottle System

 (4)  
AMM 24-22-00/201, Electrical Power - Control

 (5)  
AMM 27-32-00/501, Stall Warning System

 (6)  
AMM 34-12-01/501, Air Data System

 (7)  
AMM 34-28-01/201, Inertial Reference System

 (8)  
AMM 34-31-02/501, VOR/ILS Navigation System

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737-300/400/500MAINTENANCE MANUAL
 (9)  
AMM 34-48-03/501, Low Range Radio Altimeter System

 (10)
 AMM 34-55-02/501, DME System

 (11)
 AMM 34-57-01/501, Automatic Direction Finder System

 (12)
 AMM 34-62-01/501, Flight Management Computer System

 C. Access
 (1)  Location Zones
 211/212 Flight Compartment

 D. Prepare for the System Test
 S 715-103
 (1)  
Do the EFIS - Operational Test.

 S 715-046

 (2)  
Make sure these systems are operational:

 (a)  
Autothrottle System (AMM 22-31-00/501).

 (b)  
Air Data System (AMM 34-12-01/501).

 (c)  
Automatic Direction Finder System (AMM 34-57-01/501).

 (d)  
DME System (AMM 34-55-02/501)

 (e)  
Digital Flight Control System (AMM 22-11-01/501).

 (f)  
Flight Management Computer System (AMM 34-62-01/501)

 (g)  
Inertial Reference System (AMM 34-28-01/201)

 (h)  
Low Range Radio Altimeter System (AMM 34-48-03/501)

 (i)  
Stall Warning System (AMM 27-32-00/501)

 (j)  
VOR/ILS Navigation System (AMM 34-31-02/501)

 S 865-047
 (3)  Make sure these switches on the pilot's overhead panel, P5, are in the NORMAL position.
 (a)  
EFI Transfer Switch

 (b)  
VHF NAV Transfer Switch

 (c)  
IRS Transfer Switch

 S 865-050
 (4)  Make sure the two mode switches on the IRS mode select unit (MSU) are in the OFF position.
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737-300/400/500MAINTENANCE MANUAL
 E.  EFIS Current Status Tests
 NOTE: The EFIS Current Status Tests do a test of the status of the LRUs
____ (Line Replaceable Units) which are connected to each EFIS symbol generator.
 These status indications can be shown for the LRUs:
 -OK indicates a good interface between the LRU and the symbol generator.
 -FAIL indicates a failure of the input between the LRU and the symbol generator. FAIL is also shown when the LRU is not energized.
 - ---- dashes can indicate one of these conditions: An LRU is not installed on the airplane, or, NCD (No-Computed-Data) input between the LRU and the symbol generator, or, An LRU is energized, but the instrument transfer switches are not set for that LRU.
 S 745-051
 (1)  Do the EFIS - Left Current Status Test as follows:
 (a)  
Set the two mode switches on the IRS MSU to the NAV position.

 (b)  
Use the FMCS CDU to enter the present position for the IRS (AMM 34-28-01/201).

 (c)  
Permit time for the two ALIGN lights on the IRS MSU to go off.

 (d)  
On the ADF control panel(s) installed on the aisle control stand, P8, make sure the mode switch is in the ADF position.
　
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