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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 17.10.12
Oct 05/06
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 17.10.13
Oct 05/06
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 removed.
Gain Function
The GAIN function is used for manual gain control of the radar receiver, and is selectable from the FUNCTION section of the PFD RADAR menu.
When set to NORM, the gain is preset to a specified value. Each setting from NORM changes the sensitivity one color level.
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本文链接地址：庞巴迪挑战者605公务机机组操作手册 CL605-CHAPTER 17 -导航系统 NAVIGATION SYSTEMS(9)
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