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747-400 MAINTENANCE MANUAL
 E. Procedure
 S 864-008
 (1)  Make sure these circuit breakers are open with DO-NOT-CLOSE tags attached:
 (a)  P7 Overhead Circuit Breaker Panel
 1) 7B10 NAV RADIO ATC L
 2) 7B22 NAV RADIO ATC R

 S 114-097
 WARNING: DO NOT GET SOLVENTS IN YOUR MOUTH, OR YOUR EYES, OR ON YOUR
_______ SKIN. DO NOT BREATHE THE FUMES FROM SOLVENTS. SOLVENTS ARE HAZARDOUS MATERIALS. SOLVENTS MAY BE FLAMMABLE OR HARMFUL TO THE ENVIRONMENT. REFER TO PRODUCT MATERIAL SAFETY DATA SHEETS (MSDS) AND LOCAL REQUIREMENTS FOR PROPER HANDLING PROCEDURES.
 (2)  
Clean the airplane surface and antenna with solvent, Series 88 (AMM 20-30-88).

 S 374-086

 (3)  
If the airplane surface has corrosion or other damage, do these steps to prepare the airplane surface:

 (a)  Do this task to apply a layer of alodine to the airplane mating surface: "Apply Alodine 1000 Solution" (AMM 51-21-04/701).
 NOTE: This task removes corrosion, cleans the surface, and
____
 applies the alodine.

 (b)  Apply two layers of BMS 10-79 Type III primer to the mating surface. 1) Let each layer dry for the correct cure time.
 S 624-028
 (4)  Apply a layer of corrosion preventive compound, BMS 3-27 on the nutplate, screw holes, and connector hole.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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747-400 MAINTENANCE MANUAL
 S 624-033
 (5)  Apply a very thin coat of BMS 3-27 on the base of the antenna.
 NOTE:____ Do not use too much BMS 3-27 on the base of the antenna.
 (a)  Do not get BMS 3-27 on the O-ring or in the O-ring groove.
 S 434-011
 (6)  Examine the rubber O-ring and replace it if it is damaged.
 S 624-032
 (7)  Apply a layer of BMS 3-24 on the O-ring and O-ring groove.
 S 434-024
 (8)  Install the O-ring in their positions on the ATC antenna.
 S 624-089
 (9)  Apply a layer of Dow Corning Compound No. 4 on the coaxial connector
 if a moisture guard is used on the installation.
 S 434-094

 (10)
 Connect the DB101 (upper ATC antenna) or the DB102 (lower ATC antenna) coaxial connector to the antenna.

 S 434-090

 (11)
 Put the antenna into position.

 S 624-091

 (12)
 Apply a layer of BMS 3-27 on the threads and shank of the cadmium plated screws.

 S 424-093

 (13)
 Lightly tighten the cadmiun plated screws in a diagonal configuration.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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747-400 MAINTENANCE MANUAL
 S 434-092
 CAUTION:_______TIGHTEN THE SCREWS MANUALLY TO THE CORRECT TORQUE VALUE. USE OF POWER OR AIR TOOLS TO TIGHTEN THE SCREWS CAN CAUSE DAMAGE TO THE ANTENNA SURFACE.
 (14)
 Manually tighten the screws to 20-25 pound-inches of torque.

 S 764-015

 (15)
 Make sure the resistance between the ATC antenna base and the airplane skin is not more than 25 milliohms.

 S 114-088

 (16)
 Carefully remove excess BMS 3-27 from the screw heads and around the edge of the antenna base with solvent, Series 95 (AMM 20-30-95).

 NOTE:____Care must be taken to completely remove excess BMS 3-27. If the BMS 3-27 is not completely removed, poor adhesion of the weather proof sealant will result.
 F. ATC Antenna Test
 S 864-016
 (1) Remove the DO-NOT-CLOSE tags and close these circuit breakers.
 (a)  P7 Overhead Circuit Breaker Panel
 1) 7B10 NAV RADIO ATC L
 2) 7B22 NAV RADIO ATC R
　
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