(3)  
AMM 51-21-41/701, Alodine Coating

 (4)  
AMM 51-31-00/201, Seals and Sealing

 D. Access
 (1)  Location Zones
 107 Forward Half of Cabin, Right

 E. Installation Procedure
 S 864-005
 (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 overhead circuit breaker panel P18: 1) GPS 2

 S 114-006
 (2)  Clean the airplane skin and the inner antenna surface with the solvent, BMS 11-7 (AMM 20-10-81/701).
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 S 144-007
 (3)  If there is corrosion on the airplane skin below the antenna, prepare the airplane skin as follows:
 (a)  
Remove the corrosion (AMM 20-10-81/701).

 (b)  
Clean the airplane skin in the area of the corrosion with the solvent, BMS 11-7 (AMM 20-10-81/701).

 (c)  
Apply a layer of alodine on the airplane skin in the area where the antenna touches the skin (AMM 51-21-41/701).

 (d)  
On top of the alodine, apply two layers of the BMS 10-79 Type III primer.

 NOTE: Let each layer dry for the correct cure time.
____

 S 624-008
 (4)  
Apply a layer of the BMS 3-27 corrosion inhibiting compound in the screw holes and in the coaxial cable hole.

 S 624-009

 (5)  
Apply a very thin layer of the BMS 3-27 on the base of the antenna.

 NOTE: Do not get the BMS 3-27 on the O-ring or the O-ring groove.
____
 S 214-010
 (6)  
Examine the O-ring and replace it if it is damaged.

 S 624-011

 (7)  
Apply a layer of the BMS 3-24 grease on the O-ring and O-ring groove.

 S 434-012

 (8)  
Install the O-ring on the antenna.

 S 624-013

 (9)  
Apply a layer of the BMS 3-27 corrosion inhibiting compound on the threads and shank of the antenna screws.

 S 424-014

 (10)
 Install the GPS antenna.

 (a)  
Connect the electrical connector to the antenna.

 (b)  
Put the antenna into its position on the airplane.

 (c)  
Install three of the screws that hold the antenna.

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737-300/400/500MAINTENANCE MANUAL
 (d)  Remove the unwanted BMS 3-27 corrosion inhibiting compound from the around the antenna with the BMS 11-7 solvent (AMM 20-10-81/701).
 S 764-015
 (11) Do a check of the resistance between the antenna and the airplane skin as follows:
 (a)  Connect the ohmmeter between the base of the antenna and the airplane skin.
 NOTE: Get access to the base of the antenna through the hole
____
 for the last screw.

 1) Make sure the measured resistance is 0.025 ohms or less.
 S 434-016
 (12)
 Install the last screw that holds the antenna.

 S 114-017

 (13)
 Remove the unwanted BMS 3-27 corrosion inhibiting compound from around the head of each screw with the BMS 11-7 solvent (AMM 20-10-81/701).

 S 394-018

 (14)
 Apply the aerodynamic seal as follows (AMM 51-31-00/201):

 (a)  
Apply the BMS 5-95 sealant around the antenna where it touches the airplane skin.

 NOTE:____Make sure no air bubbles are in the sealant. Use a sufficient quantity of the sealant to make the surface smooth.

 (b)  
Make an aerodynamic fillet seal with the fillet smoothing spatula.

 (c)  
Remove all the unwanted BMS 5-95 sealant from the area around the antenna.
　
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