S 424-036

 (6)  
Move the ADF Loop antenna into position and install the mounting screws.

 S 414-022

 (7)  
Hold the antenna cover panel in position and tighten all but one of the mounting screws.

 S 424-037
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 S 764-039
 WARNING: DO NOT USE A METER THAT IS NOT EXPLOSIONPROOF TO TEST
_______ THE RESISTANCE. IF YOU DO, AN EXPLOSION CAN OCCUR AND CAUSE INJURY TO PERSONS.
 (8)  Do an electrical bonding test between the antenna cover and the airplane structure as follows (SWPM 20-20-00):
 (a)  
Connect the ohmmeter or resistance measuring bridge between the empty antenna mounting screw hole (on the antenna base plate) and the airplane skin.

 (b)  
Make sure that the resistance is not more than 1 milliohm

 (0.001 ohm).

 S 424-058
 (9)  
Install and tighten the last mounting screw.

 S 864-023

 (10)
 Supply electrical power (AMM 24-22-00/201).

 S 864-060

 (11)
 Remove the DO-NOT-CLOSE tags and close these circuit breakers:

 (a)  
P18 Circuit Breaker Panel
 1) AIRPLANES WITHOUT EFIS;
 ADF-1 AC or INST XFMR-1
 2) AIRPLANES WITH EFIS;

 ADF-1 AC or EXCIT XFMR-1
 3) ADF-1 DC

 (b)  
P6 Circuit Breaker Panel
 1) AIRPLANES WITHOUT EFIS;
 ADF-2 AC or INST XFMR-2
 2) AIRPLANES WITH EFIS;

 ADF-2 AC or EXCIT XFMR-2
 3) ADF-2 DC

 S 714-041
 (12)
 Do the System Test of the ADF system (AMM 34-57-00/501 or 34-57-01/501).

 (13)
 Remove electrical power if it is not necessary (AMM 24-22-00/201).

 S 864-026
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 ADF SENSE ANTENNA COUPLER - REMOVAL/INSTALLATION
________________________________________________
 1.  General_______
 A.  This subject has two tasks. One is for the removal and one is for the installation of the ADF sense antenna coupler.
 B.  The ADF sense antenna coupler is located in the aft outboard corner of the main wheel well assembly.
 C.  The ADF sense antenna coupler may be removed from the airplane as a unit (Fig. 401).
 TASK 34-57-21-004-044
 2.  ADF Sense Antenna Coupler Removal (Fig. 401)_________________________________
 A.  References
 (1)  
AMM 20-10-37/401, Electrical Bonding

 (2)  
SWPM 20-20-00, Standard Wiring Practices Manual

 (3)  
AMM 24-22-00/201, Manual Control

 (4)  
AMM 34-57-00/501, Automatic Direction Finder System (AIRPLANES WITHOUT EFIS)

 (5)  
AMM 34-57-01/501, Automatic Direction Finder
 (AIRPLANES WITH EFIS)

 B.  Access
 (1)  Location Zones
 216 Left Main Wheel Well - Aft Bulkhead
 217 Right Main Wheel Well - Aft Bulkhead

 C.  Procedure
 S 864-042
 (1) Open these circuit breakers and attach DO-NOT-CLOSE tags:
 (a)  P18 Circuit Breaker Panel
 1) AIRPLANES WITHOUT EFIS;
 ADF-1 AC or INST XFMR-1
 2) AIRPLANES WITH EFIS;

 ADF-1 AC or EXCIT XFMR-1 3) ADF-1 DC
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