(2)  
A00073 Aerodynamic Sealant - BMS 5-95, class B-1/2 (Ref 20-30-11)

 B. References
 (1)  
SWPM 20-20-00, Standard Wiring Practices Manual

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

 (3)  
AMM 51-31-00/200, Seals and Sealing

 (4)  
SRM 51-20-01

 C. Access
 (1)  Location Zone
 101/102 Flight Compartment

 D. Equipment
 (1)  
Sealing gun - 6-inch length cartridge, Senco Research, or equivalent (not required for material furnished in tubes)

 (2)  
Bonding meter (AMM 20-22-01)

 (3)  
Varnish brush - 1- or 2-inch (Commercial)

 (4)  
Spatula (Commercial)

 E. Procedure
 S 394-002
 (1)  
Apply a layer of BMS 3-23 corrosion-preventive compound to the mating surfaces of the antenna and the airplane structure (AMM 51-21-31/701).

 S 424-012

 (2)  
Install the ATC antenna:

 (a)  
Remove the dust caps from the electrical connectors.

 (b)  
Connect the coaxial cables to the ATC antenna.

 (c)  
Put the antenna into its position and install the screws.

 S 224-003
 (3)  Do this task to do a check of the resistance between the antenna base and the airplane skin. Electrical Bonding Check (SWPM 20-20-00).
 (a)  Make sure the resistance is not more than 0.001 ohm.
 S 434-004
 (4)  Apply the weather aerodynamic sealant (BMS 5-95) to the outer edge of the antenna (AMM 51-31-00/201).
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A 737-300/400/500MAINTENANCE MANUAL
 S 144-005
 (5)  
Remove the unwanted sealant from around the antenna base
 (AMM 51-31-00/201).

 S 864-028

 (6)
Remove the DO-NOT-CLOSE tags, and close these circuit breakers:

 (a)  
P18 Load Control Center - Left
 1) ATC 1
 2) AIR DATA SYSTEM No. 1

 (b)  
P6 Load Control Center - Right
 1) ATC 2
 2) AIR DATA SYSTEM No. 2
 3) ATC ANT SW

 F. ATC Antenna Test
 S 864-006
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 864-007

 (2)  
Set the transponder select switch on the ATC control panel to the applicable transponder.

 S 744-002

 (3)
Push and hold the TEST switch on the applicable ATC transponder.

 (a)  Make sure the self-test passes and no faults are detected.
 S 744-003
 (4)  
Release the TEST switch on the ATC transponder.

 (5)  
Remove electrical power if it is not necessary (AMM 34-22-00/201).

 S 864-001
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A
737-300/400/500MAINTENANCE MANUAL
 AIR TRAFFIC CONTROL (ATC) TRANSPONDER - REMOVAL/INSTALLATION
____________________________________________________________
 1.  General
_______
 A.  This procedure has two tasks. The first task is the removal of the ATC transponder. The second task is the installation of the ATC transponder.
 B.  The No. 1, M163, and No. 2, M381, ATC transponders are installed on the E2 rack in the main equipment center.
 TASK 34-53-21-004-001
 2.  ATC Transponder Removal
_______________________
 A.  References
 (1)  AMM 20-10-07/201, E/E Rack Mounted Components
 B.  Access
 (1)  
Location Zones
 205 Electronic Compartment

 (2)  
Access Panels
　
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