TEST Switch
Push – ADF bearing pointer indicates 45 degrees left of lubber line.

TONE Switch
TONE – adds tone to receiver audio. OFF – disables tones.
Copyright . The Boeing Company. See title page for details.
Flight Management, Navigation -Controls and Indicators 737 Operations Manual

Frequency Indicator
Indicates the frequency selected with the related frequency selector.

Frequency Selector
Rotate – . outer knob sets the hundreds number
.
middle knob sets the tens number

.
inner knob sets the tenths and ones number.

Mode Selector
OFF – removes power from associated receiver.
ANT – receiver sends only station audio.
ADF – receiver sends bearing and station audio.
TEST – ADF bearing pointer indicates 45 degrees left of lubber line.
GAIN – adjusts receiver gain.

Transfer (TFR) Switch
.
selects the left or right frequency for the ADF receiver

.
active frequency is indicated by an arrow.

TONE Switch
OFF – disables tone.
ON – adds tone to receiver audio.

Copyright . The Boeing Company. See title page for details.
11.10.16  December 7, 2001

Flight Management, Navigation -Controls and Indicators 737 Operations Manual

Frequency Indicator
Indicates the frequency selected with the related frequency selector.

Frequency Selector
Rotate – . outer knob sets the hundreds number
.
middle knob sets the tens number

.
inner knob sets the tenths and ones number.

Mode Selector
OFF – removes power from associated receiver.
ANT – receiver sends only station audio.
ADF – receiver sends bearing and station audio.
TEST – ADF bearing pointer indicates 45 degrees left of lubber line.
GAIN – adjusts receiver gain.

TONE Switch
1 – adds tone to ADF receiver No. 1 audio. 2 – adds tone to ADF receiver No. 2 audio. CENTER – disables tones.
Flight Management, Navigation -Controls and Indicators 737 Operations Manual

Frequency Indicator
Indicates the frequency selected with the related frequency selector.

Frequency Selector
Rotate – . outer knob sets the hundreds number
.
middle knob sets the tens number

.
inner knob sets the tenths and ones number.

Transfer (TFR) Switch
Selects the left or right frequency for the ADF receiver.

TEST Switch
Push – ADF bearing pointer indicates 45 degrees left of lubber line.

Beat Frequency Oscillator (BFO) Switch
BFO – adds a tone to the receiver audio.
Copyright . The Boeing Company. See title page for details.
11.10.18  December 1, 2000

Frequency Indicators
AUTO –
.
displays frequency automatically tuned by the FMC

.
display is blank when MANUAL tuning is selected

.
displays dashes during agility tuning.

MANUAL –
.
indicates the frequency selected by the frequency selector

.  
a red bar appears over MANUAL frequency when AUTO tuning is selected.

VOR/DME TEST Switch
VOR –
.
with a VOR frequency tuned and a course of 000 selected:

.
deviation bar moves to centered position

.
bearing pointer slews to 180 degrees

.
the TO/FROM ambiguity indicates FROM.

DME –
.
with a DME tuned:

.
shows DME fail flag

.
DME displays dashes

.
all zeroes (not to exceed 000.5) appear.

Flight Management, Navigation -Controls and Indicators 737 Operations Manual

ILS TEST Switch
UP/LT –
.  
With ILS frequency tuned and a course within 90 degrees of airplane
heading:

.
pointers display one dot up and one dot left. DN/RT –

.  
With ILS frequency tuned and a course within 90 degrees of airplane
heading:

. pointers display one dot low and one dot right.

AUTO/MANUAL Switch
AUTO (illuminates white) – tuning automatically accomplished by the FMC. MANUAL (illuminates white) – tuning accomplished manually by rotating the frequency selector.

Frequency Selector
Rotate – manually selects the desired frequency.

VOR TEST Switch
With a VOR frequency tuned and a course of 000 selected:
Push –

.
course deviation bar centers

.
　
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