737 Flight Crew Operations Manual
Communications -
System Description
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
D6-27370-866-EGP 5.20.5
VHF Communications
Primary short–range voice communications is provided in the VHF range by three
independent radios. Each radio provides for selection of an active frequency and
an inactive (preselected) frequency. Voice transmission and reception are
controlled at the related ACP.
The VHF/HF RTP-1 is located on the forward left side of the aft electronic panel,
VHF/HF RTP–2 is on the forward right side and VHF/HF RTP–3 is on the aft
portion of the panel. The VHF–2 and VHF-3 antennae are located on the lower
fuselage, VHF–1 is on the upper fuselage.
Note: VHF antennae located on the lower fuselage are susceptible to multipath
interference from nearby structures or vehicles. This may disrupt VHF
communications. VHF antennae located on the upper fuselage are not as
susceptible to this interference.
HF Communications
There are two independent HF communication radios, designated HF 1 and HF 2.
Each HF radio can be tuned by any radio tuning panel. HF radio sensitivity can
only be set on the on-side radio tuning panel.
Location of Call
Originator
Called Position
Visual Signal at
Called Position
Aural Signal at
Called Position
Flight deck Attendant station Pink master
call light
Two–tone chime
Flight deck Nose wheel well Horn in nose
wheel well
Attendant station Flight deck Call light on the
integrated audio
control panel
Single high–tone
chime
External Power
Connector Panel
Flight deck Call light on the
integrated audio
control panel
Single high–tone
chime
Flight deck Passenger cabin NO SMOKING
or FASTEN
BELT signs
illuminate/
extinguish
Single low–tone
chime
September 24, 2015
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