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PRIMUS
R
660 Digital Weather Radar System
A28–1146–111
REV 2
Radar Facts
5-22
Pitch Gain Error
If the aircraft is in a pitch maneuver and you see ground returns that are
not present in level flight, the pitch gain is most likely misadjusted. The
procedure in table 5–5 and figures 5–25, 5–26, and 5–27 can help you
identify this type of problem.
PITCH STABILIZATION CHECK
Once proper operation of the roll stabilization is established, verify pitch
stabilization using the procedure in table 5–5 and figures 5–25, 5–26,
and 5–27.
Step Procedure
1 Complete the steps listed in table 5–3.
2 Place the aircraft between 5 and 10° pitch up.
3 Note the radar display. If it is correctly stabilized, there
is very little change in the ground returns.
4 If the display of ground returns resembles figure 5–26,
the radar is understabilized.
5 If the display of ground returns resembles figure 5–27,
the radar is overstabilized.
Pitch Stabilization In–Flight Check Procedure
Table 5–5
Symmetrical Ground Returns – Good Pitch Stabilization
Figure 5–25