Short– And Long–Blind Alley - Honeywell PRIMUS 660 Pilot's Manual

R
PRIMUS 660 Digital Weather Radar System
Another example of the pilot's importance in helping the radar serve its
safety/comfort purpose is shown in figure 5–37. This is the blind alley
or box canyon situation. Pilots can find themselves in this situation if
they habitually fly with the radar on the short range. The short–range
returns show an obvious corridor between two areas of heavy rainfall,
but the long–range setting shows the trap. Both the near and far
weather zones could be avoided by a short–term course change of
about 45_ to the right. Always switch to long range before entering such
a corridor.
LONG RANGE
Radar Facts
5-40
THE BLIND ALLEY
40
20
Short– and Long–Blind Alley
Figure 5–37
SHORT RANGE
AD–12062–R1@
A28–1146–111
20
REV 2