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(in amber) in the status display.
- TGT. Target alert monitors for red or magenta weather conditions (rainfall rate)
beyond the selected range, 7.5° on each side of the airplane heading, and is selectable
in all but the 300 NM range. If such weather is detected outside the selected range, the
TGT alert annunciation changes from green armed to an amber alert condition on the
MFD WX Status display. When this warning is received, the pilot should select longer
ranges to view target alert. When TGT button is selected, TGT annunciation will
replace the GAIN annunciation in the status display.
TRB STAB TGT SECT
GX_16_025
N
50 50
3
6
33
30
G85%
T5.0
WX/T
SAT
GSPD
-56
TAT
TAS
-40
234
345
LX
TOC KLM
DEF GHJ
4000 4000
FL180
TRB STAB TGT SECT
GX_16_026
G85%
T5.0
WX
SAT
GSPD
-56
TAT
TAS
-40
234
STAB 345
TOC KLM
DEF GHJ
4000 4000
FL180
Annunciation
For Training Purposes Only
Sept 04
16-25
P I LOT T R A I N I N G GU I D E
NAVIGATION
- SECT. The normal radar sweep is ± 60° from the airplane nose at a rate of 12
sweeps/min. Pressing SECT button reduces the angle of sweep to ± 30° at a rate of 24
sweeps/min. Pressing the SECT button again returns to normal sweep. Both the pilot’s
and copilot’s displays will show the same sweep angle.
- GAIN. The GAIN knob is a rotary control and push/pull switch that is used to
control the receiver gain. Push on the GAIN switch to enable the preset calibrated gain
mode. Calibrated gain is the normal mode and is used for weather avoidance. Pull out
on the GAIN switch to enable the variable gain mode. Variable gain is used to provide
additional weather analysis and for ground mapping. In WX mode, variable gain
receiver sensitivity can be increased to show weak targets or can be reduced to
eliminate weak returns.
TRB STAB TGT SECT
GX_16_027
TGT
T5.0
WX
SAT
GSPD
-56
TAT
TAS
-40
234
STAB 345
TOC KLM
DEF GHJ
4000 4000
FL180
Rainfall Rate
in/hr mm/hr
.04 to .16 1 to 4
4 to 12
12 to 50
>50
.16 to .47
.47 to 2.0
>2
Color
RAINFALL COLOR CODING
TGT will be displayed as (flashing), if red
or magenta is detected outside selected range.
TGT
TRB STAB TGT SECT
GX_16_028
N N
50 50 50 50
3
3
6
6
33
33
30
30
120° ARC 60° ARC
RADAR
TST
FP
SBY GMAP
WX RCT
GAIN
MIN MAX
PULL
VAR
OFF
GX_16_029
G85%
T5.0
WX
SAT
GSPD
-56
TAT
TAS
-40
234
345
TOC KLM
DEF GHJ
4000 4000
FL180
Annunciation
Displayed only when switch is
pulled out (variable gain)
P I LOT T R A I N I N G GU I D E
NAVIGATION
16-26 For Training Purposes Only
Sept 04
WX SYSTEM OPERATION
The RADAR rotary knob is used to select the following functions:
- OFF. Turns the radar off. The system is no longer radiating and the antenna is
stowed.
- SBY. Places the radar system in standby mode. It takes approximately 45 seconds for
the system to warm up after being switched out of SBY.
- WX. Selects the weather detection mode of operation. When WX is selected,
airplane in-flight, the system is fully operational and all parameters are set for enroute
weather detection. If the rotary knob is moved directly from OFF to WX, the system
will first go into SBY for approximately 45 seconds, then become active. There is also
a hidden mode, Forced Standby FSBY. This mode is enabled automatically on the
ground, if the airplane is powered up, with the radar selected to WX. To exit FSBY,
push STAB button 4 times within 3 seconds. This mode prevents the radar from
radiating, thereby protecting the ground personnel from radiation exposure.
- RCT. Enables the Rain Echo Attenuation Compensation Technique (REACT). The
REACT compensates for attenuation of the radar signal as it passes through rainfall.
Strong targets (high attenuation levels) cause the receiver to reach its maximum gain
value in a short time/short range. Weak targets (low attenuation levels) cause the
receiver to reach its maximum gain in a longer time/longer range. When this
maximum gain value is reached, a cyan background field will appear. Any target
inside of the cyan area will appear in magenta color, indicating maximum severity.
　
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