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FMS2
VIN
DTK 030
104 NM
TTG :07 TTG :26
P604_17_011
NAVIGATION SYSTEMS
17-22 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
Weather Only (WX) Mode
Detectable weather appears as one of four colors: green, yellow, red, or magenta. The
highest precipitation rates are represented in magenta.
Weather Plus Turbulence (WX+T) Mode
Weather plus turbulence adds the detection of precipitation-related turbulence targets
to the weather mode. The highest precipitation rates and turbulence show in magenta.
WX+T is operational for ranges less than or equal to 40 NM. When ranges greater than
50 NM are selected in WX+T mode, the weather radar reverts to the WX mode.
Turbulence Only (TURB) Mode
The TURB mode on the WXP is a spring-loaded position. Selecting TURB mode
removes all targets except detected precipitation-related turbulence within the 50 NM
range. TURB mode is useful in analyzing areas of precipitation-related turbulence that
have been detected while in the WX+T mode. By removing all weather returns from
the display, the areas of turbulence (magenta) can be observed alone.
Lightning Detection System (Optional)
The lightning detection system maps electrical discharge activity (lightning) 360
degrees around the aircraft to a distance of 200 nautical miles. Three levels of
electrical activity intensity are identified. Level one represents the lowest rate of
electrical discharge and level three the highest.
The system transmits the location of up to 63 thunderstorm cells to the MFDs. The
data set is updated every two seconds. Electrical discharge activity is presented as
thunderbolts on the MFD in yellow, red, and magenta, with yellow signifying level
one, and magenta signifying level three activity.
The lightning detection system is selected by the WX button on the Display Control
Panel (DCP).
NAVIGATION SYSTEMS
For Training Purposes Only
Jan 04
17-23
P I LOT T R A I N I N G GU I D E
Controls and Indicators
Weather Radar Control Panel (WXP)
Figure 17-14
NORM
-3
-2
-1 +1
2
+3
OFF
TEST
MAP WX
WX+T
TURB
TILT
SEC XFR STAB
PUSH
AUTO
+
PUS H
GCS
Transfer Switch
Transfers control of WX radar display
range to pilot's or copilot's display
control panel.
Sector Scan Switch
When pressed in, multifunction
display indicates azimuth angle of
±30° on either side of flight path.
Not pressed, multifunction display
indicates azimuth angle of ±60° on
either side of flight path.
Receiver Gain Switch
-1, -2, -3 positions
+1, +2, +3 positions
Controls receiver gain in map
and WX modes
- Reduce
sensitivity
- Increase
sensitivity
Stabilization Select Switch
Normally, antenna stabilized by IRS
system. No MFD indication. During
an airplane attitude system failure
(USTB flashing), when pressed, MFD
displays USTB.
Ground Clutter Suppression (GCS)
Switch
When pressed in during WX mode,
reduces the intensity of ground
returns and permits clearer definition
of precipitation. Clutter suppression
lasts approximately 12 seconds.
When selected, GCS is displayed on
MFD. Any mode or range change
cancels GCS.
Mode Select Switch
OFF
TEST
MAP
WX
Mode selections indicated at top of MFD. Modes are:
- Removes power to weather radar receiver/
transmitter/antenna unit. WX off mode displayed on MFD.
- Starts weather self-test program, and test pattern
indicated on MFD, test mode displayed on MFD.
- Ground targets displayed in cyan, green, yellow, or
magenta (least to most reflective) on MFD. Map mode
displayed on MFD.
- Detectable weather displayed in green, yellow, red, or
magenta, from least reflective to most reflective. PAC
compensation and alerts enable. WX mode displayed on
MFD.
WX+T
TURB
– Enables the RTA to detect both weather and
turbulence targets
– Enables the RTA to detect turbulence targets. The
MFD displays only the detected areas of turbulence when in
the TURB mode.
Tilt Control Switch
Rotate to change antenna tilt up or
down angle for desired radar
scanning. Multifunction display (MFD)
indicates tilt angle selected. Tilt limits
are from 15° up to 15° down.
Auto-tilt Correction Switch
Push to select or deselect antenna
auto-tilt. Multifunction display
indicates auto-tilt selected as an "A"
suffixed to the tilt angle (T + 10.7A)
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