(3)
AMM 34-55-02/501, DME System - Adjustment/Test (AIRPLANES WITH EFIS)
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737-300/400/500MAINTENANCE MANUAL
C. Prepare for the Installation.
S 864-007
(1) Open the applicable DME, VHF NAV, and INSTR XFMR circuit breakers on the applicable P6 or P18 circuit breaker panel.
D. Procedure
S 864-008
(1) Install the DME interrogator.
(a)
AIRPLANES WITHOUT EFIS; Remove the DO-NOT-CLOSE tags and close the DME, VHF NAV, and INSTR XFMR circuit breakers on the P6 and P18 panels.
(b)
AIRPLANES WITH EFIS; Remove the DO-NOT-CLOSE tags and close the DME, VHF NAV, EFIS and EHSI circuit breakers on the P6 or P18 panels.
E. DME Interrogator Test
S 864-016
(1)
Supply electrical power (AMM 24-22-00/201).
S 864-017
(2)
Set the mode select switch to the "MAN" mode position.
S 864-022
(3)
Tune MANUAL frequency display to local VOR/ILS station.
S 214-031
(4)
Make sure the captain's and first officer's RDDMI shows correct readout.
S 714-032
(5)
If no local VOR/ILS station available, do the DME Operational Test (AMM 34-55-00/501, Adjustment Test for AIRPLANES WITHOUT EFIS) (AMM 34-55-02/501, Adjustment/Test for AIRPLANES WITH EFIS).
(6)
Remove electrical power if it is not necessary (AMM 24-22-00/201).
S 094-030
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737-300/400/500MAINTENANCE MANUAL
AUTOMATIC DIRECTION FINDER SYSTEM - DESCRIPTION AND OPERATION
_____________________________________________________________
1. General (Fig. 1)_______
A. The ADF (automatic direction finder) system is a navigational aid that receives radio signals and determines the direction of the signals relative to the airplane. Signal sources utilized are standard broadcast and low frequency radio range stations operating in the frequency range of 190 to 1750 kHz. The system is used for either automatic or manual determination of compass bearing to a transmitting station, for reception of weather information and other broadcast programs, and for flying radio ranges.
B. Two ADF systems are installed in the airplane. Each system consists of a receiver, sense antenna, sense antenna coupler, fixed loop antenna, quadrantal error corrector and control panel. Location of the components is shown in Fig. 1.
C. Operation and mode selection of the ADF receiver is remotely controlled by its control panel on the flight deck. The receiver uses signals from both the sense and the fixed loop antenna to compute the compass bearing to the radio station.
D. The ADF system interfaces with two RDDMI's (radio digital distance magnetic indicators) and the flight interphone system. The RDDMI's display the compass bearing to the radio station. The flight interphone system provides switching and audio monitoring equipment to handle the audio output from the automatic direction finder receiver.
E. The ADF system obtains 28 volt dc and 115 volt ac power from circuit breakers on load control centers P18 and P6. ADF No. 1 system power is from the standby bus on load control center P18 and ADF No. 2 system power is from ELEX bus 2 on load control center P6.
2. Loop Antenna____________
A. The fixed loop antenna is a sealed, nonrotating, direction-sensitive rf pick-up device for the automatic direction finder system receiver. The antenna consists of two pairs of ferrite core coils, one pair oriented parallel to and the second pair oriented perpendicular to the fore and aft axis of the airplane. Both coil pairs are coupled to the system receiver through the quadrantal error corrector and loop antenna transmission cable.
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