(b)  
Put the protective covers on the electrical connectors on the GPSSU.

 (c)  
Hold the GPSSU and remove the screws and washers that hold the GPSSU to the mounting bracket.

 TASK 34-58-11-424-008
 3. GPS Sensor Unit Installation
____________________________
 A. References
 (1)  
AMM 20-40-12/201, Electrostic Discharge Sensitive Devices

 (2)  
AMM 24-22-00/201, Manual Control

 (3)  
AMM 25-21-45/401, Sculptured Ceiling Panels

 B. Access
 (1)  Location Zones
 101/102 Flight Compartment
 107 Forward Half of Cabin, Right

 C. Installation Procedure
 S 864-009
 (1)  Make sure these circuit breakers are open with DO-NOT-CLOSE tags attached:
 (a)  
On the electronic load circuit breaker panel P6: 1) GPS 1

 (b)  
On the electronic load circuit breaker panel P18: 1) GPS 2

 S 844-019
 CAUTION: DO NOT TOUCH THE GPSSU BEFORE YOU DO THE PROCEDURE FOR DEVICES
_______ THAT ARE SENSITIVE TO ELECTROSTATIC DISCHARGE. ELECTROSTATIC DISCHARGE CAN CAUSE DAMAGE TO THE GPSSU.
 (2)  
Do the procedure for devices that are sensitive to static discharge (AMM 20-40-12/201).

 S 424-011

 (3)  
Install the GPSSU.

 (a)  
Put the GPSSU on the mounting bracket.

 (b)  
Install the washers and screws that hold the GPSSU to the mounting bracket.

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 (c)  
Remove the protective covers from the electrical connectors on the GPSSU.

 (d)  
Connect the two electrical connectors to the GPSSU.

 S 414-012
 (4)  Install the ceiling panel (AMM 25-21-45/401).
 D.  Installation Test
 S 864-014
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 864-015

 (2)  
Make sure these circuit breakers are closed:

 (a)  
On the electronic load circuit breaker panel, P6: 1) GPS 1

 (b)  
On the electronic load circuit breaker panel, P18: 1) GPS 2

 S 584-016
 (3)  
Move the airplane to a position where the GPS antennas have a clear view of the GPS satellites.

 S 714-017

 (4)  
Do these steps to see the GPS position on an FMC CDU:

 (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 NEXT PAGE key on the CDU. 1) Make sure the GPS R position is shown on the line above RADIO.

 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.
 (e)  If the GPS position is not displayed after 10 minutes, check to see if the GPS is enabled. 1) Push the NEXT PAGE key on the CDU. 2) Push the LSK adjacent to NAV STATUS>. 3) Push the NEXT PAGE key on the CDU. 4) Make sure that the ON below GPS UPDATE is highlighted on
 the NAV OPTIONS 2/2 page. 5) If the OFF below GPS UPDATE is highlighted, push the adjacent LSK.
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 6) Make sure that the display changes so that the ON below GPS
 UPDATE is highlighted.
 7) Push the NEXT PAGE key on the CDU.
　
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