(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.
(8)
Install the O-ring on the antenna.
S 624-012
(9)
Apply a layer of the BMS 3-27 corrosion inhibiting compound on the threads and shank of the antenna screws.
S 424-013
(10)
Install the GPS antenna.
S 434-020
(a) Connect the electrical connector to the antenna.
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747-400 MAINTENANCE MANUAL
(b)
Apply a large quantity of the MIL-S-8660 compound on the coaxial connector.
(c)
Put the antenna into its position on the airplane.
(d)
Install three of the screws that hold the antenna.
(e)
Remove the unwanted BMS 3-27 corrosion inhibiting compound from the around the antenna with the BMS 11-7 solvent (AMM 20-11-14/701).
S 764-014
(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 434-015
(12)
Install the last screw that holds the antenna.
S 114-016
(13)
Remove the unwanted BMS 3-27 corrosion inhibiting compound from around the head of each screw with the BMS 11-7 solvent (AMM 20-11-14/701).
S 394-017
(14)
Apply the aerodynamic seal as follows (AMM 51-31-01/201):
(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.
(d)
Fill the screw holes with the BMS 5-95 sealant.
NOTE: Make the sealant smooth in relation to the antenna
____
surface.
F. GPS Antenna Installation Test
S 864-021
(1) Supply electrical power (AMM 24-22-00/201).
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S 864-018
(2) Remove the DO-NOT-CLOSE tags and close these circuit breakers: (a) On the overhead circuit breaker panel P7: 1) 7A06 MMR L 2) 7B17 MMR R
S 584-022
(3) Move the airplane to a position where the GPS antennas have a clear view of the GPS satellites.
S 714-023
(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 PREV PAGE key on the CDU. 1) Make sure the GPS R position is shown on the line above <INDEX.
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