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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.
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).
TILT
Used to change antenna tilt
up or down angle for desired
radar scanning. Tilt limits are
15 .
Vol. 1 18--90--4
NAVIGATION SYSTEMS
Weather Radar System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
The colors used on the radar display to represent rainfall intensity are as follows:
DISPLAY
RAINFALL RATE
VIDEO INTEGRATED PROCESSOR (VIP)
CATEGORIZATIONS
COLOR
INCHES/HR
(MM/HR) STORM
CATEGORY VIP LEVEL
RAINFALL RATE
INCHES/HR
(MM/HR)
MAGENTA > 2.0
EXTREME 6 > 5.0
(> 127)
(> 51) INTENSE 5 2.0 --- 5.0
(51 --- 127)
RED 0.47 --- 2.0
VERY STRONG 4 1.02 --- 1.97
(26 --- 50)
(12 --- 51) STRONG 3 0.48 --- 1.02
(12 --- 26)
YELLOW 0.16 --- 0.47
(4 --- 12) MODERATE 2 0.1 --- 0.48
(2.5 --- 12)
GREEN 0.04 --- 0.16
(1 --- 4) WEAK 1 0.01 --- 0.1
(0.25 --- 2.5)
Vol. 1 18--90--5
NAVIGATION SYSTEMS
Weather Radar System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
Weather Radar System --- MFD Indications
Figure 18---90---3
160
80
TAT --15 C
BRT
DCP 2
WX+GCS
UTC 11:42
Multifunction Display -- Weather Radar Mode
Pilot’s and Copilot’s Instrument Panels
TAS 250 GS 254 SAT 12 C
G+3 USTB T+10.7 TGT
RADAR FAULT RADAR CONTROL FAULT
Radar Status Line
Radar Mode (cyan)
RADAR OFF -- Loss of weather radar input.
STBY -- Weather radar in standby mode.
WX -- Weather radar mode.
MAP -- Ground mapping mode.
TEST -- Radar test mode.
USTB (amber)
Indicates an attitude
system failure. Turns cyan
when radar stabilization
Receiver Gain (cyan) has been deselected.
Indicates selected gain.
Prefixed by a “”G”. Antenna Tilt (cyan)
Indicates antenna tilt
angle. Prefixed by a ”“T”.
Suffixed by an “”A” if auto
tilt is enabled.
Radar Returns
Indicates rainfall
intensity or ground
targets. A yellow arc is
displayed when the
radar cannot accurately
determine rainfall
levels.
Range Arcs (white)
Indicates range increments.
Marks placed at 30 intervals.
RADAR FAULT (cyan)
Internal fault detected.
RADAR NOT AT THIS RANGE (cyan)
Radar control has been transferred and
range disagrees with display control
panel range.
RADAR CONTROL FAULT (amber)
Radar range disagrees with display
control panel range.
Dynamic Sweep Mark (cyan)
Represents position of weather
radar antenna.
Range (white)
Indicates range as
selected on display
control panel.
TGT
Indicates target alert.
+GCS (cyan)
Indicates that ground
clutter suppression
has been selected.
RADAR NOT AT THIS RANGE
Vol. 1 18--90--6
NAVIGATION SYSTEMS
Weather Radar System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
A. System Circuit Breakers
SYSTEM SUB--SYSTEM CB NAME BUS BAR CB
PANEL
CB
LOCATION
中国航空网 www.aero.cn
航空翻译 www.aviation.cn
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