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A 737-300/400/500MAINTENANCE MANUAL
ADF NO. 2 LOOP ANTENNA AND QUADRANTAL ERROR CORRECTOR
SEE A

ADF NO. 1 LOOP ANTENNA 
LOOP ANTENNA  AND QUADRANTAL ERROR 
TRANSMISSION  CORRECTOR 
CABLE  SEE  A 
STA 560.94 
STA 597.62 
QUADRANTAL 
ERROR CONNECTOR 
LOOP ANTENNA 

CONNECTOR LOOP ANTENNA 
FWD  ASSEMBLY COVER  (9 PLACES) MOUNTING SCREWS COVER ASSEMBLY 
ANTENNA MOUNTING SCREWS (8 PLACES) (EXAMPLE) ADF LOOP ANTENNA AND QUADRANTAL ERROR CORRECTOR 
A 
Figure 401 ADF Loop Antenna Installation 

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A 737-300/400/500MAINTENANCE MANUAL
 2) AIRPLANES WITH EFIS;
 ADF-2 or EXCIT XFMR-2
 3) ADF-2 DC

 S 014-011
 (2)  
Hold the cover assembly panel and remove the screws.

 S 014-039

 (3)  
Remove the cover assembly panel.

 S 024-042

 (4)  
Hold the ADF loop antenna and remove the screws.

 NOTE: Three different lengths of screws are used to install the
____ loop antenna. Make sure to install the screws in the correct holes when you reinstall the antenna.
 S 024-012
 (5)  
Move the ADF loop antenna panel to a lower position.

 S 024-040

 (6)  
Disconnect the coaxial connector from the quadrantal error corrector.

 S 024-014

 (7)  
Remove the ADF loop antenna.

 S 024-038

 (8)  
Remove the quadrantal error corrector from the ADF loop antenna.

 TASK 34-57-11-404-016
 3. ADF Loop Antenna and Quadrantal Error Corrector Installation (Fig. 401)
____________________________________________________________
 A. Consumable Materials
 (1)  G00009 Corrosion Preventative (Dow Corning No. 4)
 -BMS 3-23
 B. 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

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A
737-300/400/500MAINTENANCE MANUAL
 (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)

 (6)  
AMM 51-21-31/701, Corrosion Removal and Control

 (7)  
SRM 51-20-10, Corrosion Prevention

 C. Access
 (1)  Location Zones
 101 Flight Compartment, Left
 102 Flight Compartment, Right
 215 Bottom Center Fuselage - Exterior

 D. Procedure
 S 144-040
 (1)  
Clean the mating surfaces of the antenna and the airplane structure (AMM 51-21-31/701).

 S 624-018

 (2)  
Apply a layer of BMS 3-23 corrosion prevention compound to the mating surfaces of the antenna and the airplane structure (SRM 51-20-01).

 S 624-017

 (3)  
Bond the mating surfaces of the antenna and the airplane structure (AMM 20-10-37/401).

 S 424-041

 (4)
Install the quadrantal error corrector on the ADF loop antenna.

 (5)
　
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