Weather Radio User Manual

PRIMUS
r
880
Digital
W
eather
Radar
System
A28-1146-102-00
Radar Facts
5-11
Tilt management is often misunderstood. It is crucial to safe operation
of airborne weather radar. If radar tiltangles arenot properlymanaged,
weather targets can be missed or underestimated.
Theupperlevelsofconvectivestormsarethemostdangerousbecause
of the probability of violent windshears and large hail. But hail and
winshear are not very reflective because they lack reflective liquid
water.
The figures that follow show the relationship between flight situations
andthecorrecttiltangle.Thefirstdescribesahighaltitudesituation;the
second describes a low altitude situation.
D The ideal tilt angle shows a few ground targets at the edge of the
display (see figure 5-8).
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Ideal Tilt Angle
Figure 5-8
D Earth’s curvature can be a factor if altitude is low enough, or if the
selected range is long enough, as shown in figure 5-9.
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Earth’s Curvature
Figure 5-9