737 Flight Crew Operations Manual
Communications -
Controls and Indicators
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
D6-27370-866-EGP 5.10.5
1 Transmitter Selector (MIC SELECTOR) Switches
Illuminated – related switch is active
Push –
• selects related communication system for subsequent transmission
• only one switch may be selected at a time; pushing a second switch
deselects first switch
• reception possible over selected system regardless of whether related
receiver switch is on.
2 SELCAL Light
Illuminated - Accompanied by chime, alerts crew that communication is desired
on indicated communication radio. Will automatically reset when microphone is
keyed, control wheel mic switch is pressed or R/T-I/C switch is positioned to R/T.
3 Receiver Switches
Illuminated (white) – related switch is active
Rotate – adjusts volume
Push –
• allows reception of related communication system or navigation
receiver
• multiple switches may be selected
Push again – deselects related system or receiver.
YK981 - YQ456
4 Push–to–Talk Switch
(spring–loaded to neutral position)
R/T (radio–transmit) – keys oxygen mask or boom microphone for transmission
as selected by transmitter selector.
I/C (Intercom) – keys oxygen mask or boom microphone for direct transmission
over flight interphone and bypasses transmitter selector.
YW273, YW274
4 Push–to–Talk Switch
(Manually latch to neutral position)
R/T (radio–transmit) – keys oxygen mask or boom microphone for transmission
as selected by transmitter selector.
I/C (Intercom) – keys oxygen mask or boom microphone for direct transmission
over flight interphone and bypasses transmitter selector.
September 15, 2016
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