Communication Test (COMM TEST) Switch YA721 - YA809
Push –
.
removes automatic squelch feature, permitting reception of background noise and thereby testing receiver operation
.
improves reception of weak signals.
Communication Test (COMM TEST) Switch YC411, YC413
Push –
.
removes automatic squelch feature, permitting reception of background noise and thereby testing receiver operation
.
improves reception of weak signals.
Copyright . The Boeing Company. See title page for details.
Communications -Controls and Indicators 737 Flight Crew Operations Manual
Radio Tuning Panel YA613 - YA687, YC153, YC154, YD651 - YK104
YA686, YA687
YA626
Copyright . The Boeing Company. See title page for details.
5.10.4 September 29, 2005
Communications -Controls and Indicators 737 Flight Crew Operations Manual
YA613
YD651 - YK104
Copyright . The Boeing Company. See title page for details.
September 29, 2005 5.10.5
Communications -Controls and Indicators 737 Flight Crew Operations Manual
YC153, YC154
Frequency Transfer Switch
Push –
.
transfers the STANDBY window frequency to the ACTIVE window and tunes the selected radio to the new active frequency
.
transfers the ACTIVE window frequency to the STANDBY window.
Frequency Indicator
ACTIVE – displays the tuned frequency of the selected radio.
YC153, YC154, YD651 - YD655
. displays DATA if the selected radio is in the data mode.
STANDBY – displays the preselected or previously tuned frequency of the selected radio
Radio Tuning Switch
Push –
.
selects the VHF or HF radio to be tuned
.
the tuned frequency is displayed in the ACTIVE frequency indicator
.
the standby frequency is displayed in the STANDBY frequency indicator
Radio Tuning Panel OFF Switch
Push –
.
disconnects the panel from the communication radios
.
switch illuminates (white).
Copyright . The Boeing Company. See title page for details.
5.10.6 September 29, 2005
Communications -Controls and Indicators 737 Flight Crew Operations Manual
HF Sensitivity Control
Rotate – adjusts the sensitivity of the on–side HF receiver.
Radio Tuning Light
Illuminated (white) - indicates the selected radio.
Offside Tuning Light
Illuminated (white) –
.
the radio normally associated with this panel is being tuned by another
radio tuning panel, or
.
the radio tuning panel is being used to tune a radio not normally
associated with this radio tuning panel.
Frequency Selector
Rotate - selects frequency in the STANDBY frequency indicator:
.
first digit is always 1
. outer selector changes second and third digits in 1 MHz increments
YA626 - YA687, YC153, YC154, YD651 - YD655
.
inner selector changes fourth, fifth, and sixth digits in 25 KHz increments.
YA613, YK101 - YK104
.
inner selector changes fourth, fifth, and sixth digits in 8.33 KHz
increments.
YC153, YC154, YD651 - YD655
.
For airplanes with ACARS, tuning above maximum or below minimum
frequency displays DATA in Frequency Indicator.
VHF TEST Switch
Push –
.
removes automatic squelch feature, permitting reception of background
noise and thereby testing receiver operation
.
improves reception of weak signals.
AM Light
Illuminated (white) – HF AM is selected.
Extinguished – HF USB is selected.
AM Switch
Push – sets the AM (amplitude modulation) or USB (upper side band) mode for the selected HF.
Copyright . The Boeing Company. See title page for details.
Communications -Controls and Indicators
Radio Tuning Panel Fail Modes
YA613 - YA687, YD651 - YK104
YC153, YC154
INOP Indication
The selected radio is not available.
PANEL FAIL
The radio tuning panel has failed.
Copyright . The Boeing Company. See title page for details.
5.10.8 June 1, 2005
Communications -Controls and Indicators 737 Flight Crew Operations Manual
Radio FAIL YC153, YC154
The selected radio has failed.
YA613 - YA687, YD651 - YK104 Note: The selected frequencies may continue to be displayed in the frequency indicator when the radio is not available.
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