(3)
On each RMI, set the source selector switches to the ADF position.
(4)
For each ADF system, when the function switch is positioned to ADF and the receiver is tuned to receive a radio station, the appropriate ADF needle in each RMI should point toward the received station, confirming that the system is operating properly.
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EFFECTIVITY
AIRPLANES WITH DUEL FREQUENCY INDICATION
K73712
ADF Simplified Schematic 5C8
34-57-01 Figure 3 (Sheet 1) Oct 20/83
Page 10
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
EFFECTIVITY
AIRPLANES WITH DUAL FREQUENCY INDICATIONS
K73703
5C8 ADF Simplified Schematic
Oct 20/83 Figure 3 (Sheet 2) 34-57-01
Page 11
EFFECTIVITY
AIRPLANES WITH SINGLE
FREQUENCY INDICATION
K73723
ADF Simplified Schematic 5C8
34-57-01 Figure 3 (Sheet 3) Oct 20/83
Page 12
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
EFFECTIVITY
AIRPLANES WITH SINGLE
FREQUENCY INDICATION
K73724
5C8 ADF Simplified Schematic
Oct 20/83 Figure 3 (Sheet 4) 34-57-01
Page 13
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
AUTOMATIC DIRECTION FINDER (ADF) SYSTEM - TROUBLE SHOOTING
1. General
A. Since duplicate ADF systems are installed in the airplane, and each pilot’s RMI may receive signals from both systems, trouble shooting can be accomplished quite readily. Interchanging antenna inputs to components may prove to be the most practical method to isolate antenna system malfunctions. Erratic indications from either ADF system may be isolated to a single component by following the trouble charts.
2. Automatic Direction Finder System
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H30416
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AUTOMATIC DIRECTION FINDER SYSTEMS - ADJUSTMENT/TEST
1. Automatic Direction Finder (ADF) Systems Test
A. General
(1) Check that interphone system is operational before this test is performed (Ref 23-52-0, Interphone System). The interphone system is used for monitoring audio output of ADF receivers.
B. Prepare for Test
(1)
Provide electrical power (Ref 24-22-0, MP).
(2)
Check that following circuit breakers on panel P18 are closed.
(a)
ADF No. 1
(b)
Compass System
(c)
Instrument Transformer No. 1
(3)
Check that following circuit breakers on panel P6 are closed.
(a)
ADF No. 2
(b)
Compass System
(c)
Interphone System
(d)
Instrument Transformer No. 1
(e)
Control Cabin Lighting, Panel and Instrument 28V Primary F/O and CAPT & CTR
(4)
Check that captain's and first officer's 5-volt ac circuit breaker located on the P41 and P42 panels are closed.
(5)
Turn on radio master power switch.
(6)
Set VOR/ADF selector switch on each RMI to ADF.
(7)
Set mode selector switch on the captain's and first officer's ADF control panels to ANT position, TONE switch to TONE, and GAIN control to maximum.
(8)
Select ADF-1 on audio selector panels. Adjust audio gain control for adequate listening level.
5C8
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C. Test ADF System (Airplanes with dual frequency indications)
(1)
Set and hold mode selector switch to test. Check that the corresponding RMI pointers indicate 315 +5 degrees relative bearing (assuming north to be under lubber line).
(2)
Set TONE (BFO) switch to OFF and select TEST mode. Check that loud and clear audio tone, of more than adequate level can be attained using GAIN controls on ADF control panel and pilots' audio selector panels, as required.
(3)
Tune to a known station in the 190- to 1750-kHz range using left frequency selector to verify audio reception. Check that indicated tuned frequency, for clear and loud audio reception, is within 1 kHz of the station listed frequency. Check also that RMI pointers are stowed horizontally (90- or 270-degree relative bearing).
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