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Sept 04
WEATHER RADAR (WX)
The weather radar control panel, located on the pedestal, controls GAIN, RADAR
modes, TILT and Lightning Sensor System (LSS) (if installed). It also enables
turbulence (TRB) mode, antenna stabilization (STAB), target alert (TGT) and sector
scan (SECT).
RADAR LSS TILT
TST
FP
GMAP
CLR
TST
SBY OFF
WX RCT SBY LX
PULL
ACT
+
–
GAIN
MIN MAX
PULL
VAR
TRB STAB TGT SECT
OFF
GX_16_022
STAB ON/OFF Button
Used to enable or disable
antenna stabilization.
TRB Button
Used to determine if turbulence
is present in WX mode at 50 NM
or less.
TGT Button
Used to detect weather
conditions beyond
selected range.
SECT Button
Used to select either
the normal scan (120°)
or alternate scan (60°).
GAIN Knob
Used to control
receiver gain.
TILT Knob
Used to select tilt angle.
Clockwise rotation tilts
beam upward to +15°,
counterclockwise tilts the
beam downward to -15°.
RADAR Rotary Knob
OFF
SBY
WX
RCT
GMAP
FP
TST
Used to select the following functions:
• Turns the radar system off.
• Selects standby mode, stops
antenna scan and transmitter.
• Selects weather radar mode.
• Selects rain echo attenuation
compensation technique.
• Selects ground mapping mode.
• Selects flight plan mode.
• Selects the radar test mode.
–
–
–
–
–
–
–
Lightning Sensor System (LSS)
(if installed)
OFF
SBY
LX
CLR/TST
Used to select the following LSS
operating modes:
• Turns the LSS off.
• Selects standby mode.
• Displays LSS data on MFD.
• Selects test mode.
–
–
–
–
For Training Purposes Only
Sept 04
16-23
P I LOT T R A I N I N G GU I D E
NAVIGATION
The weather radar system provides a display of X-band radar detectable areas of
precipitation along and within 60° on either side of the airplane’s flightpath. Weather
radar returns, turbulence and lightning (if LSS installed) are displayed on the MFDs
(MAP mode only). A range of up to 300 NM from the airplane is selectable using the
up or down buttons on the MFD control panel.
RADAR ANTENNA
The antenna sweep is selectable for either 120° (60° each side of the airplane) or 60°
(30° each side). The antenna tilt is adjustable between - 15° (down) and + 15° (up).
The antenna maintains its stabilization with respect to the horizon regardless of the
airplane attitude (within - 15 to + 15°).
GX_16_023
G85%
T5.0
38
0 . 05L
HDG
315
ETE1+36
12 . 5NM
DEF
360 FMS1
N
50 50
3
6
33
30
KABC
KLM
TOC
GHJ
LUF
DEF
WX
ET
00:10
SAT
GSPD
-56
TAT
TAS
-40
234
345
LX
TOC KLM
DEF GHJ
4000 4000
FL180
WX Mode
and Status
Annunciation
Lightning
Annunciation
WX Radar Range
• 10 NM
• 25 NM
• 50 NM
• 100 NM
• 200 NM
• 300 NM
NOTE:
WX RADAR will
synchronize to whatever
range is displayed on
MFD (on power up).
MAP MODE
GX_16_024
ANTENNA
HANDLE
WITH CARE
P I LOT T R A I N I N G GU I D E
NAVIGATION
16-24 For Training Purposes Only
Sept 04
MODE SELECTION
The weather radar operating modes, gain and antenna tilt functions are all controlled
by the two radar control panels. Both the pilot and copilot can look at different ranges
and tilt settings at the same time on their respective MFDs.
The weather radar modes and features are as follows:
- TRB. Momentarily pressing the TRB button enables the turbulence mode. When this
mode is selected, the radar determines if turbulence is present. TRB can only be
engaged in the WX mode and in selected ranges of 50 NM or less. The weather/
turbulence WX/T mode is annunciated in the status display. Areas of at least moderate
turbulence are shown in soft white.
- STAB. The STAB button turns the pitch and roll stability ON and OFF. The
stabilization system uses IRS as a reference. It is also used to override forced standby
and get radar display on the ground (press 4 times in 3 seconds). STAB is annunciated
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