PRIMUSr 880 Digital Weather Radar System
Mode annunciation for the turbulence detection mode is the /T legend that is added to the WX annunciation. The resultant annunciation is WX/T for weather and turbulence. The color bar legend on the dedicated radar indicator includes a T within a soft white square whenever turbulence detection is turned on. EFIS/MFD does not have a color bar legend.
The PRIMUSâ 880 Digital Weather Radar measures the motion of raindrops to determine areas of turbulence. The radar must detect precipitation before it can detect turbulence. It cannot detect clear air turbulence.
WARNING
THE PRIMUSâ 880 DIGITAL WEATHER RADAR CAN ONLY DETECT
TURBULENCE WITHIN AREAS OF PRECIPITATION. IT CANNOT DE- TECT CLEAR AIR TURBULENCE.
The turbulence detection threshold is moderate turbulence. That is, any area of raindrop motion that is detected as moderate, severe, or extreme turbulence is displayed in white. Areas shown as turbulent are at least moderate turbulence and can be severe, extreme, or combinations of the three levels of turbulence. All three must be avoided.
Turbulence is most accurately measured within ? 30_ of straight ahead. Turbulence measurements outside this area experience reduced accuracy. The reduced accuracy results from the effects of the antenna scan angle and aircraft motion. Levels of turbulence are described in the Airman’s Information Manual and are shown in figure 5- 34.
Radar Facts | A28- 1146- 102- 00 |
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