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NAVIGATION SYSTEMS
17-16 For Training Purposes Only
Jan 04
P I LOT T R A I N I N G GU I D E
Mode Knob
The mode knob selects the weather radar operating mode. Available modes are:
• OFF
• TEST (test mode)
• MAP (ground mapping mode)
• WX (weather)
• WX+T (weather and turbulence)
• TURB (turbulence only)
Annunciation of the selected mode is displayed on the MFD weather radar mode line.
Sector Control (SEC) Button
Pushing the SEC button on the WXP alternatively selects or deselects sector scan
mode. When selected, radar scans ± 30 degrees from aircraft heading. When
deselected, normal ± 60° scan resumed.
Transfer Control (XFR) Button
Pushing the XFR button on the WXP alternately selects or deselects the transfer
function. In single-WXP installations, weather radar range control transfers to the
cross-side DCP when the XFR function is selected.
In a dual-WXP installation, operation of the XFR button transfers complete weather
radar control to the cross-side WXP and DCP (range, mode, gain and tilt). The crossside
WXP and DCP units control both MFD radar displays. Transfer is allowed on one
side only, and the pilot has priority.
When transfer is selected, an “X” annunciates on both MFD radar mode lines and the
slaved side line is shown in yellow. The weather radar message RADAR NOT AT
THIS RANGE will appear on the slaved side anytime MFD range disagrees with the
master side.
Stabilization Control (STAB) Button
Pushing the STAB button on the WXP alternately selects or deselects antenna
stabilization. Normally, antenna stabilization is selected to automatically stabilize the
radar antenna with attitude input data from the IRS system. This provides a constant
antenna scan attitude regardless of the aircraft pitch and roll attitudes.
If antenna stabilization is not selected, attitude input data is removed from the antenna
drives. This allows the weather radar system to remain operational if an IRS input
failure occurs.
If an IRS failure occurs or if stabilization has been deselected via the STAB button,
USTB flashes in cyan for 10 seconds then remains steady, indicating that stabilization
NAVIGATION SYSTEMS
For Training Purposes Only
Jan 04
17-17
P I LOT T R A I N I N G GU I D E
is not available. If an IRS failure occurs, or two WXPs are installed and the cross-side
WXP is in control, the annunciation is in yellow.
Tilt Control
The weather radar antenna tilt arc is 30 degrees above and below the horizon. Fifteen
degrees is for manual tilt selection and the remaining 15 degrees is for automatic
stabilization. The system automatically adjusts the antenna tilt in response to aircraft
pitch and roll attitude changes.
The selected tilt angle (-15° to +15°) is displayed on the weather radar mode line of the
MFDs.
Auto-Tilt Control
Pushing the PUSH AUTO button in the center of the TILT knob alternately selects or
deselects automatic tilt. When selected, the antenna tilt is adjusted to maintain a
constant tilt/range ratio as radar range selection is changed. The MFD tilt angle
readout is appended by “A” to indicate that automatic tilt is enabled.
The antenna tilt is automatically adjusted when aircraft altitude or radar range is
changed. This will keep a ground return at the same relative position on the display.
For example, if a ground return was indicated at 40 miles on a 50-mile range setting, it
would show at 80 miles (4/5 of the display) if the range setting were changed to 100
miles.
Display Control Panel
WX Button
Pushing the WX button selects the weather radar and/or lightning detection system
displays on the MFD. Each push of the WX button sequentially cycles through the
following selections:
• WX (weather displayed only)
• LX (lightning displayed only)
• WX/LX (weather and lightning displayed), then
• OFF (removing both from the MFD display)
Display selections are shown on the weather radar mode line of the MFD.
Range Knob
The range knob on the DCP is used to set the display range. The outer range ring of the
MFD is numbered with the selected range. The middle range ring indicates half the
selected range. The available ranges are 5, 10, 25, 50, 100, 200 and 300 NM when
weather radar is in use.
NAVIGATION SYSTEMS
17-18 For Training Purposes Only
Jan 04
P I LOT T R A I N I N G GU I D E
In a dual-WXP installation, weather radar range and weather radar overlay selections
are controlled individually on each the DCP. The applicable range selection is shown
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