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DC BUS
1
WEATHER RADAR
CONT 2
CB1--K3
DC BUS
1
WEATHER
RADAR R/T
<0040>
Vol. 1 18--90--3
REV 56, Jan 31/03
NAVIGATION SYSTEMS
Weather Radar System
Flight Crew Operating Manual
CSP A--013
MASTER
Weather Radar System Control Panel <MST>
Figure 18---90---2
XFR
Used to transfer control of display range to
opposite side display control panel.
Controlling side range values are displayed
in white and non--controlling side values are
displayed in yellow.
STAB
Used to deselect radar stabilization
by disconnecting attitude reference
signal in the event of an attitude
system failure.
GCS
When pressed in during
WX mode, ground cluster
suppression (GCS)
reduces the intensity of
ground returns and
permits clearer definition
of precipitation.
Suppression lasts
approximately 12 seconds.
Any mode or range
change cancels GCS.
AUTO
When pushed in, tilt is
automatically adjusted for
changes made in altitude
or range.
SEC
Used to select 30
sector scan instead of
the normal 60 sector
scan. Display refresh
or update rate doubles.
GAIN
Used to control receiver
gain.
NORM -- Display
colors accurately
present detected
rainfall levels.
--1, --2, --3 Positions:
Reduces sensitivity
to eliminate weaker
weather targets.
+1, +2, +3 Positions:
Increases sensitivity
to enable crew to
differentiate between
rainfall levels.
TILT
Used to change antenna tilt
up or down angle for desired
radar scanning. Tilt limits are
15 .
Used to transfer control to opposite side
radar control panel and display control
panel. Controlling side range values are
displayed in white and non--controlling side
values are displayed in yellow.
<0028>
Mode Select
Used to select radar mode of
operation.
OFF -- Removes power from
the transmitter and places
radar in standby mode.
TEST -- Starts radar self--test.
Test pattern displayed on MFD.
MAP -- Ground targets are
displayed on MFD in cyan,
green, yellow or magenta
(depending on strength).
WX -- Detectable weather
displayed in green, yellow, red
or magenta (depending on
estimated rainfall rate).
SEC XFR STAB
TILT
OFF
TEST
WX
MAP
GAIN
--1
--2
--3
+1
+2
+3
NORM
Radar Control Panel
Center Pedestal
REV 56, Jan 31/03
Vol. 1 18--90--4
NAVIGATION SYSTEMS
Weather Radar System
Flight Crew Operating Manual MASTER
CSP A--013
Weather Radar System --- MFD Indications <MST>
Figure 18---90---3
Range arcs (white)
2 Arcs displayed (full range and half scale
range) when weather radar is superimposed
on the following MFD formats:
Navaid sector mode,
VOR map mode
FMS mode
Present position map mode (FMS only)
TCAS mode -- Arc color changes to white
in ground mapping mode.
PAC (path attenuation correction)
alert, yellow arc displayed.
Arc indicates heavy precipitation and has
attenuated radar beam (cut visibility).
Additional targets may be masked.
<0024><0050>
The readout is prefixed
by a ”T”. Suffixed by an
“”A” if auto--tilt is selected.
Receiver Gain
Readout (cyan)
Indicates gain selected
at GAIN switch:
G--1, G--2, G--3 --
Indicates progressive
decreased gain as
GAIN knob is rotated
counterclockwise.
G+1, G+2, G+3 --
Indicates progressive
increased gain as GAIN
knob is rotated
clockwise.
Azimuth Tick Mark
(cyan)
(at 30--degree intervals)
Dynamic Sweep Mark
(cyan)
Represents position of
weather radar antenna.
Range Readout
(cyan)
Indicates range
selected on display
control panel.
Multifunction Display(2)
Pilot’s and Copilot’s Instrument Panels
USTB (amber)
Turns (cyan) when Weather
radar stabilization deselected.
Range arcs (white)
4 Arcs displayed on weather
radar display, marking range
increments.
Range from 5NM to 320NM.
Vol. 1 18--90--5
REV 56, Jan 31/03
NAVIGATION SYSTEMS
Weather Radar System
Flight Crew Operating Manual
CSP A--013
MASTER
The colors used on the radar display to represent rainfall intensity are as follows:
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