737 Flight Crew Operations Manual
Flight Management, Navigation -
Controls and Indicators
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
11.10.20 D6-27370-866-EGP
2 Frequency Selector
Rotate –
• outer knob sets the hundreds number
• middle knob sets the tens number
• inner knob sets the tenths and ones number.
3 Mode Selector Switch
ADF –
• audio reception possible
• ADF bearing sent to the DUs and the standby radio magnetic indicator.
ANT –
• audio reception optimized
• no ADF bearing data available.
OFF – removes power from selected receiver.
TEST – tests related ADF bearing pointers and warning flags on the DUs and the
standby radio magnetic indicator.
• DU ADF indications:
• show ADF fail flag and ADF bearing pointer goes out of view
• ADF fail flag goes out of view and ADF bearing pointer remains out
of view
• ADF bearing pointer slews to 135 degrees relative bearing.
• Standby radio magnetic indicator:
• shows ADF fail flag
• ADF fail flag goes out of view and ADF bearing pointer stays at its
last position before test
• ADF bearing pointer slews to 135 degrees relative bearing.
4 TONE Switch
1 – adds tone to ADF receiver No. 1 audio.
2 – adds tone to ADF receiver No. 2 audio.
OFF – disables tones.
September 15, 2016
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