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PRIMUS
r
880
Digital
W
eather
Radar
System
A28-1146-102-00
Radar Facts
5-14
D Under the right conditions, a dangerous thunder bumper can
develop in 10 minutes, and can in fact spawn and mature under the
radar beam as the aircraft approaches it, as shown in figure 5-14.
If flying at 400 kt groundspeed, a fast developing thunderstorm that
spawns 67 NM in front of theaircraft can be large enough to damage
the aircraft by the time it arrives at the storm.
AD-35699@
FREEZING
LEVEL
THUNDERST
ORM
MA
TURES
AS IT APPROACHES
Fast Developing Thunderstorm
Figure 5-14
D At low altitude, the tilt should be set as low as possible to get ground
returns at the periphery only as shown in figure 5-15.
CORRECT WRONG
FREEZING
LEVEL
AD-35700@
Low Altitude Tilt Management
Figure 5-15
Excess up-tilt should be avoided as it can illuminate weather above
the freezing level.
NOTE: The pilot should have freeze level information as a part of
the flight planning process.