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a TA when time to closest point of approach (CPA) is
between 20 and 48 seconds. An advisory voice message
“TRAFFIC, TRAFFIC” may be heard through the
audio system.
(4) RESOLUTION ADVISORY (RA) (TCAS II only) — A
solid red square indicates that the intruding aircraft is
projected to be a collision threat. TCAS II calculates
that the intruder has reached a point where a resolution
advisory is necessary. The time to closest approach
with the intruder is now between 15 and 35 seconds,
depending on your altitude. The symbol appears with
an audio warning and a vertical maneuver indication
on the PFD VSI.
ENHANCED GROUND PROXIMITY WARNING SYSTEM (EGPWS)
EGPWS is shown on the MFD by pushing the EGPWS menu button on
the MFD main menu. When TERRAIN is selected for display, the
EGPWS sends the terrain data directly to the MFD display unit via the
WX picture bus and replaces the WX display with terrain information.
If a potential terrain hazard is sensed by the EGPWS, terrain data automatically
pops up on the MAP. This “pop-up” mode defaults to the
10 NM range. EGPWS annunciators are described in the table below
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 INHB or
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-126A
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
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