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PRIMUS
r
880
Digital
W
eather
Radar
System
A28-1146-102-00
Radar Facts
5-56
Step Procedure
1 Keep TGT alert enabled when using short ranges to
be alerted if a new storm cell develops in the
aircraft’s flightpath.
2 Keep the gain in preset. The gain control should be
in preset except for brief periods when variable gain
is used for detailed analysis. Immediately after the
analysis, switch back to preset gain.
WARNING
DO NOT LEAVE THE RADAR IN VARIABLE GAIN. SIG-
NIFICANT WEATHER MAY NOT BE DISPLAYED.
3 Any storm with reported tops at or greater than
20,000 feet must be avoided by 20 NM.
WARNING
DRY HAIL CAN BE PREVALENT AT HIGHER ALTI-
TUDES WITHIN, NEAR, OR ABOVE STORM CELLS,
AND SINCE ITS RADAR REFLECTIVITY IS
POOR, IT MAY NOT BE DETECTED.
4 Use increased gain (rotate GAIN control to its
maximum cw position) when flying near storm tops.
This helps display the normally weaker returns that
could be associated with hail.
Severe Weather Avoidance Procedures
Table 5-12 (cont)