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reflectivity levels. Detectable weather appears as one of four colors: green yellow, red or
magenta. The highest precipitation rates are represented in magenta.
NAVIGATION SYSTEMS
Description
Vol. 2 17−10−9
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
WEATHER RADAR SYSTEM (CONT'D)
Weather Radar Display Levels
Figure 17−10−8
WX + TURB Mode
In WX + TURB mode, weather and turbulence detection are combined, so that return signals
can be received for precipitation and precipitation-related turbulence.
The highest precipitation rates and turbulence show in magenta.
WX + TURB is operational for ranges less than or equal to 40 NM. When ranges greater than
50 NM are selected in WX + TURB mode, the weather radar reverts to WX mode.
TURB Mode
In TURB mode, only the detection of the precipitation-related turbulence is displayed. With this
mode, the pilot can look up for areas of concern that have been identified using the WX +
TURB mode.
When radar ranges are greater than 50 NM, the TURB mode is inoperative.
MAP Mode
In MAP mode, the radar system receives ground returns for terrain mapping. Ground targets
are displayed in cyan, green, yellow or magenta (least to most reflective) on the navigation
formats.
NAVIGATION SYSTEMS
Description
Vol. 2 17−10−10
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
WEATHER RADAR SYSTEM (CONT'D)
Weather Radar Operational Modes
Figure 17−10−9
Path Attenuation Correction (PAC) Alert Indication
In WX and WX + TURB modes, the PAC feature compensates for the radar energy that is
absorbed as the beam penetrates a precipitation cell. When the radar detects weather formations
that could cause energy to be absorbed and possibly give a false return, the radar sensitivity is
corrected.
If the precipitation cell is of sufficient dimensions to use the full range of attenuation correction, a
condition known as PAC alert occurs. The yellow PAC alert arc informs the pilot that the radar
beam is being severely attenuated, and that the area of shadow behind the intervening rainfall
may contain hidden, and possibly significant, precipitation. Avoid flight into the area between the
displayed weather and the yellow PAC alert.
NAVIGATION SYSTEMS
Description
Vol. 2 17−10−11
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
WEATHER RADAR SYSTEM (CONT'D)
Weather Radar PAC Alert
Figure 17−10−10
Target/Turbulence Alert Function
Target and turbulence alert function (TGT/TRB) allows the radar to detect weather targets and
alert the crew, without the targets themselves showing on the display. It is used as a background
feature when other data is being displayed on the navigation format. Therefore, a TGT or TRB
alert advises the pilot of areas of important precipitation or turbulence (red or magenta weather
targets).
When TARGET ARM is selected in the FUNCTION section of the PFD RADAR menu*, the radar
automatically evaluates a target window of ±15° of aircraft heading from 7 to 200 NM range,
regardless of the range selected on the DCP. A cyan TGT is displayed below the radar tilt status
line, to indicate the TARGET ARM selection.
* In order to have target function active, the following conditions must be met:
• Radar mode must be ON; and
• The onside PFD and MFD radar overlays are selected off.
When a significant turbulence target is detected within the alert window, a flashing yellow TGT is
displayed in place of cyan TGT.
When a significant precipitation target is detected, a flashing yellow TRB is displayed left of TGT
annunciation.
NAVIGATION SYSTEMS
Description
Vol. 2 17−10−12
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
WEATHER RADAR SYSTEM (CONT'D)
Sector Scan Function
When SEC SCAN is selected in the FUNCTION section of the PFD RADAR menu, the radar
scans ±30° from aircraft heading, therefore the display update rate is increased. When deselected,
normal ±60° scan resumes.
Ground Clutter Suppression Function
To permit a better definition of precipitation, the ground clutter suppression decreases the intensity
of ground returns when operating in WX mode.
GCS is activated by selecting GCS in the FUNCTION section of the PFD RADAR menu. Ground
return intensity decreases, and the cyan GCS annunciation is displayed on the radar mode line.
After 30 seconds, the ground return reverts to normal intensity, and the GCS annunciation is
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