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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 S 024-042
 (3)  Install dust caps on the electrical connectors.
 TASK 34-57-51-404-043
 3. ADF Receiver Installation
_________________________
 A. References
 (1)  
AMM 20-10-07/201, E/E Rack-Mounted Components

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

 (3)  
AMM 34-57-00/501, Automatic Direction Finder System (AIRPLANES WITHOUT EFIS)

 (4)  
AMM 34-57-01/501, Automatic Direction Finder System (AIRPLANES WITH EFIS)

 B. Access
 (1)  
Location Zones
 205 Electronic Compartment

 (2)  
Access Panels
 1201L Electronic Equipment Access Door

 C. Procedure
 S 864-043
 (1)  Make sure these circuit breakers are open:
 (a)  
P18 Circuit Breaker Panel
 1) AIRPLANES WITHOUT EFIS;
 ADF-1 AC or INST XFMR-1
 2) AIRPLANES WITH EFIS;

 ADF-2 AC or EXCIT XFMR-2 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 424-044
 CAUTION: DO NOT TOUCH THE CONNECTOR PINS OR OTHER CONDUCTORS ON THE ADF
_______ RECEIVER. IF YOU TOUCH THESE CONDUCTORS, ELECTROSTATIC DISCHARGE CAN CAUSE DAMAGE TO THE ADF RECEIVER.
 (2)  
Remove the dust caps from the electrical connectors.

 S 214-045

 (3)  
Examine the unit and rack connectors for unwanted materials and loose or damaged pins.

 (4)  
Install the ADF receiver (AMM 20-10-07/201).

 S 424-015
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A
737-300/400/500MAINTENANCE MANUAL
 D. ADF Receiver Test
 S 864-017
 (1)
Set the mode switch on the ADF control panel to the OFF position.

 S 864-016

 (2)  
Supply electrical power (AMM 24-22-00/201).

 S 864-042

 (3)
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-2 AC or EXCIT XFMR-2
 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 714-047
 (4)  
Do the Operational Test of the ADF system (AMM 34-57-00/501 or 34-57-01/501).

 (5)  
Remove electrical power if it is not necessary (AMM 24-22-00/201).

 S 864-040
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A
737-300/400/500MAINTENANCE MANUAL
 GLOBAL POSITIONING SYSTEM - DESCRIPTION AND OPERATION
_____________________________________________________
 1.  General_______
 A.  The global positioning system (GPS) is a satellite-based radio navigation system that calculates airplane position and instantaneous time with a high degree of accuracy. The GPS carrier frequencies are 1575.42 megahertz and 1227.6 megahertz. Commercial receivers use the 1575.42 megahertz frequency only.
 B.  The GPS consists of two global positioning system sensor units (GPSSUs) and two passive antennas (Fig. 1). Power is applied to the system through the GPS 1 and GPS 2 circuit breakers on the P6 and P18 overhead circuit breaker panels.
　
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