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and are displayed in the upper left corner of the MFD.
The terrain data is displayed above the airplane symbol on the MFD in
green, yellow, and red colors that define the elevation of the terrain relative
to the airplane’s current altitude. Terrain that is more than 2000
feet below the airplane is not included in the display.
A moving marker scrolls across the bottom of the EGPWS display as an
indication that the terrain is display is operational.
Annunciator Description
TERR INHIB
(inhibit)
TERRAIN displays and aurals associated
with terrain are inhibited (annunciation
in white)
TERR FAIL The TAWS is inoperative.
TERR TEST EGPWS is in test mode.
TERR N/A TERRAIN map not available.
TERR TERRAIN map selected for display.
Pilot’s Manual
5-60 PM-132A
AUDIO CONTROL SYSTEM
The pilot’s and copilot’s digital audio control panels are located outboard
of the PFDs on each side of the flight deck. Microphone transmit
selector buttons are located in a row along the top edge of this panel
(Figure 5-16). For night flying operations, the microphone selector buttons
are annunciated with a lighted bar on the switch indicating the selected
microphone. When these latching buttons are pushed, they
connect the microphone (hand-held microphone, boom microphone, or
oxygen mask microphone) to the selected radio. They simultaneously
enable the audio associated with that radio, regardless of the setting on
the audio on/off buttons located below these microphone transmit selector
buttons. The microphones selector buttons are mechanically interlocked
so that each new selection automatically deselects the
previous selection. Depressing the PA button connects the on-side microphone
to the passenger address amplifier. The audio level for the PA
is automatically adjusted for conditions and cannot be adjusted by the
crew. The pilot will use either a hand-held microphone or boom microphone
for transmissions. Oxygen mask microphones are used when the
MIC/MASK selector is in the extended (unlatched) position.
An EMER switch is located in the upper right corner of each audio control
panel. When the EMER switch is depressed, the microphone and
audio reception is connected directly to VHF 1 and NAV 1 and all functions
of the audio control panel are bypassed except the headphone volume.
In order to receive NAV 1 audio with EMER selected, the NAV
AUDIO switch on the clearance delivery radio must be selected ON.
When EMER is selected on the audio control panel and power is available
to the control units, COM and NAV frequencies are set using either
RMU or the clearance delivery radio. If EMER is selected and electrical
power is still available to the audio panel, system warning audios will
still be available through the cockpit speaker and audio will be routed
to the cockpit voice recorder. Regardless of whether power is lost to the
audio control panel, the EMER switch is operational, however, system
warning audio and audio to the cockpit voice recorder are inoperative.
The audio source selector controls are located on the lower rows of the
audio control panel. When these push-on/push-off switches are
latched (in position) audio is turned off from that receiver. When unlatched
(out position), the audio associated with that button is connected
to the headphone and also to the speaker, if it is selected on. The
audio level can be adjusted by rotating the button, counterclockwise to
decrease, and clockwise to increase the volume.
Pilot’s Manual
PM-132A 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
　
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