come on after approximately 6 seconds. 4) Make sure the GPS annunciator on the IRS MSU (P5) comes on after approximately 6 seconds. 5) Push one of the master caution lights (P10) to stop the flashes.

 (c)  
Close the GPS 1 circuit breaker on the P6 panel and the GPS 2 circuit breaker on the P18 panel.

 (d)  
Make sure the GPS annunciator on the IRS MSU goes off.

 (e)  
Stop for approximately 5 minutes until the GPS L and GPS R positions are shown again.

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A
737-300/400/500MAINTENANCE MANUAL
 S 865-021
 (4) Remove electrical power if it is not necessary (AMM 24-22-00/201).
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737-300/400/500MAINTENANCE MANUAL
 GPS SENSOR UNIT - REMOVAL/INSTALLATION
______________________________________
 1.  General
_______
 A.  This procedure has two tasks. The first task is the removal of a GPS Sensor Unit (GPSSU). The second task is the installation of a GPSSU.
 B.  There are two GPSSUs installed on the airplane. They are located above the ceiling between stations 500A and 500C approximately three feet to the right of the centerline.
 TASK 34-58-11-024-001
 2.  GPS Sensor Unit Removal (Fig. 401)
_______________________
 A.  References
 (1)  
AMM 20-40-12/201, Electrostatic Discharge Sensitive Devices

 (2)  
AMM 25-21-45/401, Sculptured Ceiling Panels

 B.  Access
 (1)  Location Zone
 107 Forward Half of Cabin, Right

 C.  Removal Procedure
 S 864-002
 (1) Open these circuit breakers and attach DO-NOT-CLOSE tags:
 (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 014-003
 (2)  Remove the right ceiling panel at station 500A (or 500B) to get access to the left (or right) GPSSU (AMM 25-21-45/401).
 NOTE: The GPSSUs are located above the overhead stowage bins,
____ approximately three feet to the right of the centerline.
 S 914-006
 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.
 (3)  Do the procedure for devices that are sensitive to static discharge (AMM 20-40-12/201).
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A

737-300/400/500
MAINTENANCE MANUAL

SCULPTURED 
CEILING 
PANEL  GPSSU 
(ABOVE STOWAGE BIN) 
SEE  A 
CURVED 
CEILING 
PANEL 

FWD PANEL TRANSITION 
STOWAGE BIN  PANEL CEILING LOWERED 
PASSENGER CABIN 
WASHER (TYPICAL) (TYPICAL) SCREW 

FWD

GPSSU
A
Global Positioning System Sensor Unit Installation
Figure 401

F08894
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