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decrease, and clockwise to increase the volume.
Pilot’s Manual
PM-126A 5-61
One knob, labeled DME, controls the audio reception for both DME 1
and DME 2. When the DME knob is unlatched (out position) and the
arrow on the knob is centered straight up, the audio level is at a minimum.
Rotating the control knob in either direction toward 1 or 2 will
increase the volume for that corresponding channel only. The audio
level pointers on the knobs are displayed for night flight. There are separate
controls for speaker volume and headphone volume which adjust
the volume level for all audio buttons selected. The speaker push-on/
push-off selector is combined with the sidetone knob. When the speaker
switch is extended, it turns on audio to the on-side speaker. The
speaker sidetone audio is controlled by the speaker SIDETONE volume
control and the SPEAKER volume control for both on-side and off-side
transmit conditions.
The ID/BOTH/VOICE switch is located on the right side of the audio
panel. In the ID position, the VOR and ADF audio is filtered to enhance
the Morse Code identification and eliminate the voice signal. In the
VOICE position, the ident audio is filtered to pass the voice content
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-126A
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-126A 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
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