
COMMUNICATIONS, AUDIO INTEGRATING
Description
Aircraft Operations Manual
4/1.1
PAGE
4
Apr 01/15
3.
CONTROLS AND INDICATORS
A11576
A
A
XMIT SELECT
HOT
MIC
COLD
BOOM
MASK
NORM
EMER
1 COM 2 COM 3
HF
INT
VOICE
IDENT
PTT
1 NAV 2
PA
SPKR
MKR
1 ADF 2
A
AUDIO CONTROL PANEL
VOICE/IDENT switch.
VOICE
−
Voice signals only.
IDENT
−
Both audio code and voice signals.
PTT button.
Press To Transmit.
XMIT SELECT pushbuttons.
−
Momentarily press associated button to
select COM/HF for transmitting (HF if
installed, COM 3 not used).
−
Selected button illuminates.
MIC switch.
HOT
−
Headset or mask microphone is
continuously on in the intercom.
COLD
−
The microphone is only on in the
intercom when the PTT is de-
pressed for transmission.
BOOM/MASK switch.
BOOM
−
Headset microphone selected.
MASK
−
Oxygen mask microphone
selected.
NORM/EMER switch.
NORM
−
Control of the COM’s is managed
by the ACP.
EMER
−
Bypass of the REU if the audio
system fails.
−
Direct connection with the COM
by headset and control wheel PTT
button only.
−
For L side ACP; COM 1, L control
wheel PTT and L headset.
−
For R side ACP; COM 2, R control
wheel PTT and R headset.
−
Fixed volume.
Loudspeaker volume.
Even if the volume is turned down, warning
signals and PA chime signals can still be
heard over the loudspeaker.
Volume controls.
Slide levers for volume control of
associated system, for example:
INT
−
intercom
MKR
−
marker
PA
−
cabin PA
(COM 3 not used)
Fig. 2 Audio Control Panel, ACP
−
controls