737 Flight Crew Operations Manual
TEST – tests related ADF bearing pointers and warning flags on the DUs and the standby radio magnetic indicator.
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DU ADF indications:
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show ADF fail flag and ADF bearing pointer goes out of view
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ADF fail flag goes out of view and ADF bearing pointer remains out of view
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ADF bearing pointer slews to 135 degrees relative bearing.
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Standby radio magnetic indicator:
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shows ADF fail flag
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ADF fail flag goes out of view and ADF bearing pointer stays at its last position before test
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ADF bearing pointer slews to 135 degrees relative bearing.
TONE Switch
1 – adds tone to ADF receiver No. 1 audio.
YA801 - YA809, YD651 - YD655 2 – adds tone to ADF receiver No. 2 audio.
YA613, YA626 2 – inoperative.
OFF – disables tones.
YA721, YA722, YC411, YC413, YK101 - YK104
Frequency Indicator
Shows the frequency selected with the related frequency selector.
Shows if the system is in the ADF or antenna (ANT) mode.
Copyright . The Boeing Company. See title page for details.
11.10.20 June 1, 2005
Flight Management, Navigation -Controls and Indicators 737 Flight Crew Operations Manual
Frequency Selector
Rotate – . outer knob sets the hundreds number
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middle knob sets the tens number
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inner knob sets the tenths and ones number.
Mode Selector
ADF –
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audio reception possible
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ADF bearing sent to the DUs and the standby radio magnetic indicator. ANT –
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audio reception optimized
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no ADF bearing data available.
TONE Switch
OFF – disables tones.
ON – adds tone to selected ADF receiver audio.
Transfer (TFR) Switch
Selects ADF for display. YA686, YA687, YC153, YC154
Frequency Indicator
Shows the frequency selected with the related frequency selector.
Shows if the system is in the ADF or antenna (ANT) mode.
Copyright . The Boeing Company. See title page for details.
Flight Management, Navigation -Controls and Indicators 737 Flight Crew Operations Manual
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
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.
TONE Switch
OFF – disables tones.
ON – adds tone to selected ADF receiver audio.
Transfer Switch
Selects ADF for display.
Copyright . The Boeing Company. See title page for details.
11.10.22 March 28, 2005
Flight Management, Navigation -Controls and Indicators 737 Flight Crew Operations Manual
Marker Beacon Annunciations
Marker Beacon Lights
OM (cyan) – illuminates over an outer marker beacon.
MM (amber) – illuminates over a middle marker beacon.
IM (white) – illuminates over an inner marker beacon.
FT (white) – illuminates during self test.
VHF Navigation Control
Copyright . The Boeing Company. See title page for details.
Flight Management, Navigation -Controls and Indicators 737 Flight Crew Operations Manual
Frequency Indicator
Indicates the frequency selected by the frequency selector
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tuned frequency displayed in STANDBY display
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TFR switch moves STANDBY frequency to ACTIVE frequency.
TEST Switch
With a VOR frequency tuned and a course of 000 selected:
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shows VOR fail flag
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deviation bar biases out of view and then returns to centered position
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bearing pointer slews to 180 degrees
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DME displays:
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DME fail flag
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dashes
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normal DME distance. With ILS frequency tuned and a course within 90 degrees of airplane heading:
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pointers disappear and LOC and G/S flags appear momentarily
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pointers appear and display one dot up and one dot left
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pointers then display one dot low and one dot right
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pointers then return to normal display
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DME displays:
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DME fail flag
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dashes
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normal DME distance.
