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CL−604 Operating Manual
PSP 604−6
WEATHER RADAR SYSTEM (CONT'D)
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 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 (lighting 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.
In a dual-WXP installation, weather radar range and weather radar overlay selections are
controlled individually on each DCP. The applicable range selection is shown on each MFD.
In a single-WXP installation, radar range is controlled with the DCP located on the same side
of the cockpit as the WXP, providing transfer mode is not selected (XFR button on the DCP).
NAVIGATION SYSTEMS
Description
Vol. 2 17−10−13
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
WEATHER RADAR SYSTEM (CONT'D)
Display Control Panel (DCP)
Figure 17−10−11
Weather Radar Displays
Pushing the WX button on the DCP adds the weather radar overlay to the following MFD
formats:
• NAV SECTOR
• FMS MAP
• TCAS
Figure 17−10−14 shows an example of the weather radar overlay on the supported MFD
formats.
Weather radar system and/or lightning detection system failure messages are displayed on the
weather radar mode line, or in the lower left and right corners of the MFDs.
NAVIGATION SYSTEMS
Description
Vol. 2 17−10−14
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
WEATHER RADAR SYSTEM (CONT'D)
MFD Formats − Display of Weather Radar
Figure 17−10−12
NAVIGATION SYSTEMS
Description
Vol. 2 17−10−15
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
WEATHER RADAR SYSTEM (CONT'D)
Display Levels
The colors used on the radar display to represent rainfall intensity are as follows:
Weather Radar Display Levels
DISPLAY LEVEL RAINFALL RATE (MM/HR) RAINFALL RATE
(INCHES/HR)
6 (magenta) Turbulence Turbulence
5 (yellow) PAC (path attenuation
correction)
PAC (path attenuation
correction)
4 (magenta)
Intense >51 >2.0
3 (red)
Strong >12.7 − 51 >0.5 − 2.0
2 (yellow)
Moderate >3.8 − 12.7 >0.15 − 0.5
1 (green)
Weak >0.76 − 3.8 >0.03 − 0.15
0 (black) >0.15 − 0.76 >0.006 − 0.03
Path Attenuation Correction (PAC) Alert Mode
When a precipitation cell is of sufficient dimensions to use the full range of attenuation
　
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