Honeywell 880 Manual

A SERVICE OF

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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 tilt angles are not properly managed,

weather targets can be missed or underestimated.

The upperlevels of convective stormsare the most dangerousbecause

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

and thecorrect tilt angle. Thefirst describes a high altitude situation;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