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Nosewheel
Well
INTERPHONE
UNIT
Pilot PTT
Switch
JACK PANEL JACK PANEL
AUDIO CONTROL PANEL
Speaker Speaker
P604_06_001
HDPH MIC MIC
I/C
OFF
R/T
NOSE
DN
NOSE
UP
AP
SC
SYNC
I/C
OFF
R/T
NOSE
DN
NOSE
UP
AP
SC
SYNC
Copilot PTT
Switch
HDPH MIC
COMMUNICATIONS
6-4 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
Audio Control Panel
Figure 6-2
Public Address (PA)
Flight deck to cabin
communication
1 - VHF - 2
1 - DME - 2
1 - NAV - 2 1 - MKR - 2
1 - ADF - 2
R/T
I/C
VOICE
BOTH
SPKR MASK
BOOM
EMER
NORM
PA
VHF 3 1 - HF - 2 INT/SVC
MIC Selector
Switch
Emergency/Normal
Switch
Norm
Emer
- Services as
selected
- RX/TX on
VHF, audio on nav
and aural warnings
boom and mask
microphone
VHF 1/2/3 COMM
Audio Controls
HF 1/2
Audio Controls
ADF 1/2
Audio Controls
Marker Beacon
Audio Controls
Radio Transmit (R/T)
Intercom (I/C) Switch
R/T
I/C
(Center Off -
Momentary at R/T)
- used for boom or
mask mic
- hot mic for boom
or mask through
intercom system
VOICE / BOTH
Switch
VOICE
BOTH
- voice
information only
- voice and cw
ident
Flight Compartment
Speaker (SPKR)
Audio Control
Mask/Boom Mic Switch
Mask
Boom
- oxygen mask
- boom microphone
DME 1/2
Audio Controls
NAV 1/2
Audio Controls
Intercom/Services
Audio Control
P604_06_002
For All
Audio Controls:
Push ON
Push OFF
Backlit when ON
Rotate for volume
COMMUNICATIONS
For Training Purposes Only
May 03
6-5
P I LOT T R A I N I N G GU I D E
VHF Communication System
Description
The VHF communication system consists of two very high frequency (VHF)
transceivers (VHF 1 and VHF 2) which operate independently. The VHF transceivers
provide amplitude modulated (AM) short-range voice communications in the
frequency range of 118.00 to 151.975 MHz, selectable in increments of 25 KHz/
8.33 KHz.
Components and Operation
The VHF communication system consists of the following components:
• two transceivers
• two antennas
Associated components:
• two radio tuning units (RTUs)
• two audio control panels
• one reversionary / inhibit panel
• integrated avionics processor system (IAPS)
Transceivers
Two VHF-422B transceivers contain the circuits required for transmission and
reception of radio signals, and processing of audio signals.
Antennas
There are two VHF antennas located as follows:
• VHF 1 antenna - upper side of the fuselage
• VHF 2 antenna - underside of the fuselage
Integrated Avionics Processor System
The integrated avionics processor system (IAPS) is a card cage assembly that
physically houses some avionic line replaceable units (LRUs). The IAPS reads several
avionic buses and distributes data to those LRUs requiring the information. Most
avionics data is processed by this unit.
COMMUNICATIONS
6-6 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
VHF Communication System - Block Diagram
Figure 6-3
AUDIO SYSTEM
VHF COMM
NO. 1
XCVR
VHF COMM
NO. 2
XCVR
IAPS
FMS FMS
DC
BATT
DC
BUS 2
A
C
C
A
B B
VHF 1
ANTENNA
118.00 - 151.975 MHz
VHF 2
ANTENNA
118.00 - 151.975 MHz
PILOT'S RTU
REVERSIONARY /
INHIBIT PANEL
COPILOT'S RTU
VHF 1
ONLY
P604_06_003
INHIBIT PUSH
1-RTU-2 FMS TUNE
1 2
AFCS
SEL
STBY
1 2
ATC
SEL
FMS
TUNE
INHIB
RTU 1
INHIB
RTU 2
INHIB
IDENT
DME-H
1/2
BRT
BRT
116.30
ACT PRE
111.35
NAV1
ACT PRE
121.90 149.10
COM1
373.0
ADF 1 TCAS
TA
ATC1
NEXT
PAGE 5540
TONE
REL
IDENT
DME-H
1/2
BRT
BRT
116.30
ACT PRE
111.35
NAV1
ACT PRE
121.90 149.10
COM2
373.0
ADF 1 TCAS
TA
ATC1
NEXT
PAGE 5540
TONE
　
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