C. Access
 (1)  Location Zones
 117 Electrical and Electronics Compartment
 221/222 Control Cabin

 D. Prepare for the Test
 S 865-015
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 865-225

 (2)  
Make sure that the airplane is in a location where it can receive GPS signals.

 S 865-016

 (3)  
Set the Capt's EIU source select switch to the L position.

 S 865-017

 (4)  
Set the F/O's EIU source select switch to the R position.

 S 865-018

 (5)  
Set the EICAS EIU source select switch to the C position.

 S 825-019

 (6)  
Set the left AOA vane to 0 degrees.

 S 865-020

 (7)
Set the Capt's Air Data source select switch to the L position.

 S 865-021

 (8)  
Set the mode select switches on the captain's and first officer's EFIS control panels to the MAP mode.

 S 865-022

 (9)  
Set the TERR switches on the captain's and first officer's EFIS control panels to the on position.

 (a)  Make sure the "TERR" message and the terrain display data (test pattern) show on the ND's.
 S 865-025
 (10)
 Make sure the landing gear downlock pins are installed
 (AMM 32-00-30/201).

 (11)
 Do the GPWS - Operational Test (AMM 34-46-00/501).

 S 715-026
 NOTE: You can do an operational test of the GPWS without using
____ the CMC. To do the operational test, push the GPWS self-test switch in the flight compartment for at least 6 seconds.
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747-400
MAINTENANCE MANUAL

 E. Program Pin Test
 S 865-027
 (1)  Open this circuit breaker and install a DO-NOT-CLOSE tag:
 (a)  P415 Power Distribution Center Panel
 1) L39 CMC R

 S 865-028
 (2)  
Select < OTHER FUNCTIONS from the CMC menu.

 S 865-029

 (3)  
Select < INPUT MONITORING.

 S 865-030

 (4)  
Select BIN display.

 S 865-031

 (5)  
Enter E/002/352/00.

 S 755-036

 (6)  
Make sure that bits 29 thru 11 are 0000110010010011110.

 S 865-045

 (7)  
Enter E/002/353/00.

 S 755-046

 (8)  
Make sure that bits 29 thru 11 are 010000010011001X1XX.

 S 865-049

 (9)  
Enter E/002/355/00.

 S 755-224

 (10)
 Make sure that bits 29 thru 11 are 0110001001000010X10.

 S 865-060

 (11)
 Close this circuit breaker and remove the DO-NOT-CLOSE tag:

 (a)  P415 Power Distribution Center Panel
 1) L39 CMC R

 S 865-061
 (12) Open this circuit breaker and install a DO-NOT-CLOSE tag:
 (a)  P414 Power Distribution Center Panel
 1) L08 CMC L

 F. Present Status Check
 S 745-062
 (1)  Make sure the green COMPUTER OK light on the front panel of the GPWC is on.
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747-400 MAINTENANCE MANUAL
 G. Gear Input Discrete Test
 S 865-063
 (1)
Select < OTHER FUNCTIONS from the CMC menu.

 S 865-064

 (2)
Select < INPUT MONITORING.

 S 865-065

 (3)
Select HEX display.

 S 865-066

 (4)
Enter E/002/351/00.

 S 865-067
 WARNING: MAKE SURE THAT ALL PERSONNEL ARE CLEAR OF THE LANDING GEAR AND
　
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