(b)  
Push the line select key (LSK) that is adjacent to <MENU.

 (c)  
Push the LSK that is adjacent to <CMC.

 (d)  
Push the NEXT PAGE key.

 (e)  
Push the LSK that is adjacent to <EXISTING FAULTS.

 (f)  
Push and release the NEXT PAGE key until <34 NAV RADIOS is shown.

 (g)  
Push the LSK that is adjacent to <34 NAV RADIOS.

 NOTE: If <34 NAV RADIOS does not show, ignore the next
____
 two steps.

 (h)  
Push and release the NEXT PAGE key until the failure messages are shown.

 (i)  
Make sure that none of these failure messages are shown: 1) IRU-L>GPSSU-L BUS FAIL 2) IRU-R>GPSSU-R BUS FAIL 3) IRU-C>GPSSU-L BUS FAIL 4) IRU-C>GPSSU-R BUS FAIL

 S 865-013
 (4)  
Set the captain's and first officer's FMC source select switches to the L position.

 S 715-020

 (5)  
Do these steps to see the GPS position output to the left FMC:

 (a)  
Push the INIT/REF key on one of the CDUs.

 (b)  
Push the line select key (LSK) that is adjacent to <INDEX.

 (c)  
Push the LSK that is adjacent to <POS.

 (d)  
Push the PREV PAGE key on the CDU. 1) Make sure the GPS R position is shown on the line above <INDEX.

 2)  Make sure the GPS L position is shown on the line above the GPS R position.
 NOTE: As much as 10 minutes of time can be necessary for
____ the positions to show on the CDU.
 S 715-014
 (6)  Do these steps to do a check of the GPS/FMC data busses.
 (a)  Open the 7A6 MMR L circuit breaker on the P7 panel. 1) Make sure the GPS L position goes out of view on the CDU. 2) Make sure the GPS R position stays in view on the CDU.
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747-400 MAINTENANCE MANUAL
 (b)  Open the 7B17 MMR R circuit breaker on the P7 panel. 1) Make sure the GPS R position goes out of view on the CDU. 2) Make sure the GPS L position stays out of view on the CDU.
 S 865-015
 (7)  
Set the captain's and first officer's FMC source select switches to the R position.

 S 715-017

 (8)  
Do these steps to see the GPS position output to the right FMC:

 (a)  Close the 7A6 MMR L and 7B17 MMR R circuit breakers on the P7 panel. 1) Make sure the GPS R position is shown on the line above
 <INDEX. 2) Make sure the GPS L position is shown on the line above the GPS R position.
 NOTE: As much as 10 minutes of time can be necessary for
____ the positions to show on the CDU.
 S 865-017
 (9)  
Set the captain's FMC source select switch to the L position.

 S 715-018

 (10)
 Do these steps to do a check of GPS time data:

 (a)  Push the NEXT PAGE key on the CDU.
 1)  Make sure the UTC (GPS) time is displayed to the left of the GPS position.
 S 865-021
 (11) Remove electrical power if it is not necessary (AMM 24-22-00/201).
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747-400 MAINTENANCE MANUAL
 GPS ANTENNA - REMOVAL/INSTALLATION
__________________________________
 1.  General
_______
 A.  This procedure has two tasks. The first task is the removal of a GPS antenna. The second task is the installation of a GPS antenna.
 B.  There are two GPS antennas on the airplane. The forward (left) antenna is installed at station 1385. The aft (right) antenna is installed at station 1404.
 TASK 34-58-02-024-019
 2.  GPS Antenna Removal (Fig. 401)
___________________
 A.  Equipment
 (1)  Sealant removal tool - hardwood or plastic
　
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