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pushbutton. Audio sources selected on the audio control panel can be routed to the
flight compartment speakers by pressing in the speaker switch. Speaker volume is
controlled by rotating the speaker control.
A radio transmit (R/T) and intercom (I/C) switch is used to transmit on the radios or
passenger address system. The R/T position, when pressed, allows the pilot to
transmit. When released, it returns to the OFF position, to receive. Continuous (“hot
mike”) conversation is provided in the I/C position for the intercom systems. A radio
transmit (R/T) and intercom (I/C) switch is also provided on each pilot control wheel.
NOTE
Hot--mic communications can be selected by any one
of the following switches:
S RT/IC switch on any audio control panel
S INT/SVC transmit select switch on any audio control panel with PTT
pushed
S IC/OFF/RT switch on any audio control panel.
Selecting VOICE on the VOICE/BOTH switch eliminates the station Morse code
identifier from VOR, ILS and ADF received signals. The MASK/BOOM switch gives the
flight crew a choice between headset with boom mike (or hand mike) with BOOM
selected, or the oxygen mask microphone, when MASK is selected.
During normal operation, the latching EMER/NORM switch is in the NORM position.
The EMER position is used only when the audio integrating system fails. The
EMER/NORM switch is disabled at the observer’s station.
REV 56, Jan 31/03
Vol. 1 05--20--2
COMMUNICATIONS
Audio Integrating System
Flight Crew Operating Manual MASTER
CSP A--013
When the pilot’s audio control panel EMER/NORM switch is set to EMER, the pilot’s
headset is connected directly to NAV 1 navigation radio and VHF 1 communication
radio. Most of the system is bypassed making most audio control panel functions
inoperative. Cockpit speakers are disabled and all warnings and tones are heard
through the headsets. The observers station, passenger address and interphones are
disabled in emergency mode.
Vol. 1 05--20--3
REV 56, Jan 31/03
COMMUNICATIONS
Audio Integrating System
Flight Crew Operating Manual
CSP A--013
MASTER
Communications --- Block Diagram
Figure 05---20---1
DISABLE
MAINT
JACKS
RADIO XCVRS
PILOT
COPILOT
OBSERVER
COCKPIT AREA MICROPHONE
(BEHIND ELT PANEL)
HEADSETS
REV 56, Jan 31/03
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COMMUNICATIONS
Audio Integrating System
Flight Crew Operating Manual MASTER
CSP A--013
Audio Control Panel <MST>
Figure 05---20---2
Receive Pushbuttons
Press to monitor respective navigation
or communication system. Press again
to deselect. Switches are lit when
pressed. Any number of audio sources
can be monitored at the same time.
Rotate clockwise to increase volume.
EMER / NORM (Lever--locked)
NORM -- Normal functions.
EMER -- Bypasses audio electronics
control unit.
Pilot has two--way communication on
VHF 1, audio on NAV 1 and aural warnings.
Copilot has two--way communication on
VHF 2, audio on NAV 2 and aural warnings.
Observer has aural warnings only.
Audio Control Panel
Center Pedestal
Inoperative at observer’s
audio control panel.
NOTE
Transmit Selector
Selects desired communications system and
energizes channel. Only one channel at a
time may be selected.
SPKR
Press to select and deselect audio on
the flight compartment speakers.
Rotate to adjust volume.
MASK/BOOM
MASK -- Oxygen mask microphone
of respective station is active.
BOOM -- Boom microphone of
respective station is active.
Radio Transmit (RT)
Intercom (IC)
Used to transmit on radios or
passenger address system.
RT -- When held, permits
communication using
headset or oxygen mask
microphones.
IC -- Provides hot mic talk
through interphone system.
VOICE/BOTH
VOICE -- Station
identification is filtered
out allowing only voice
signals to be audible.
BOTH -- Station
identification and voice
signals are audible.
Inoperative at observer’s
audio control panel.
NOTE
<0008> <0011> <0014>
<0011> <0008> <0014>
1 -- VHF -- 2 INT/SVC
PA
HF 1 -- VHF -- 2 INT/SVC
PA
VHF 3
PA
<0060>
PA
PA
<0008> <0014> <0060>
Vol. 1 05--20--5
REV 56, Jan 31/03
COMMUNICATIONS
Audio Integrating System
Flight Crew Operating Manual
CSP A--013
MASTER
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