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only and in the BOTH position, voice and ident signals will be heard
simultaneously.
The controls for the marker beacon receiver are located at the bottom of
the audio panel. They include the marker audio volume control (MKR),
marker sensitivity control (LO SENS/HI SENS) and marker mute control
(MUTE). The sensitivity is controlled by the rotation of the MUTE
control. If either audio panel MKR sensitivity control is set LO, then
both MKR receivers are set to LO, regardless of the position of the other
audio panel controls. Either pilot can temporarily mute the marker beacon
receiver by depressing the MUTE/HI/LO switch.
ON
SPKR
DIGITAL AUDIO CONTROL PANEL
Figure 5-16
Pilot’s Manual
5-62 PM-132A
The INPH (interphone) volume control adjusts the on-side headset audio
level when the interphone function is used. The interphone operates
on a “hot microphone” basis. The interphone is not available over
the cockpit speaker except when the oxygen mask audio is selected.
The MIC/MASK control allows for microphone audio switching between
the boom/hand-held microphone (MIC) and the oxygen mask
microphone (MASK). When the switch is latched (depressed position),
MIC is selected and when the switch is unlatched (out position), MASK
is selected.
The MASK intercom feature provides interphone audio to the on-side
cockpit speaker. Audio is available regardless of the SPKR ON/OFF
button position. Selecting INPH allows adjustable volume control of
the off-side MASK intercom on the speaker.
Warning system audio signals are input to the audio panel for dissemination
to the flight crew over the headphones and speaker. The audio
output from the headphone, speaker, and microphone are recorded by
the Cockpit Voice Recorder (CVR). The CVR microphone is the input
for the AGC circuit and if the CVR microphone becomes disabled, or
the CVR circuit breaker is pulled, then the aural warnings will be at the
fixed HIGH volume level. If the Crew Warning Panel (CWP) has detected
a fault in any one of the audio output channels, or in the Automatic
Gain Control (AGC) input, a CAS annunciation will be posted.
The following CAS illuminations are specific to the crew warning panel
audio:
The pilot’s audio panel receives 28-vdc from the left essential bus and
is protected by a 3-amp circuit breaker labeled AUDIO 1/CLR DLY on
the pilot’s circuit breaker panel (AVIONICS [COMMUNICATIONS]
group). The copilot’s audio panel receives 28-vdc from the right essential
bus and is protected by a 3-amp circuit breaker labeled AUDIO 2 on
the copilot’s circuit breaker panel (AVIONICS [COMMUNICATIONS]
group). The passenger address amplifier receives power from the left
essential bus and is protected by the CABIN PA 5-amp circuit breaker
on the pilot’s circuit breaker panel (AVIONICS [COMMUNICATIONS]
group).
CAS Color Description
WARN AUDIO Amber The audio function of the Crew Warning
Panel (CWP) has failed.
WARN AUDIO White • A Crew Warning Panel (CWP) audio output
channel fault is detected.
or
• A problem exists with the Automatic Gain
Control (AGC).
Pilot’s Manual
PM-132A 5-63
CLEARANCE DELIVERY RADIO (CDR)
The Clearance Delivery Radio (CDR), Figure 5-17, is located on the
right, front corner of the center pedestal. The CDR provides an alternative
capability for tuning the VHF COM 1 transceiver and the VHF
NAV 1 radio. The CDR will tune the VHF COM radio prior to applying
electrical power to the airplane. The CDR control head is normally
powered by the left essential bus through the AUDIO 1 circuit breaker;
however, it and other communication related equipment can be powered
from the right forward hot bus, prior to applying electrical power
to the aircraft.
With airplane batteries OFF, depressing the momentary action RADIO
CTL HOT BUS switch on the center pedestal applies power from the
right hot bus to the left audio control panel, CDR control panel, COM
section of the integrated communications unit, and NAV section of the
integrated navigation unit. The display on the CDR is liquid crystal
type with white letters on a black background. The push button,
display, and control identifier legend are on a black background
displayed with electroluminescent lighting.
In the emergency mode, RMU and FMS tuning capabilities are inhibited
and the COM and NAV units are tuned exclusively by the CDR. An
AUX ON caption replaces the NB or WB annunciators on the RMUs to
indicate that tuning through the RMUs is inhibited. Tuning through the
CDR is no different when EMRG is selected, but the CDR does not look
　
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