Honeywell PRIMUS 660, Pilot'S Manual

Page: 68 / 162

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
ÁÁÁÁÁ
ÁÁÁÁÁ
1
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
Complete the steps listed in table 5–3.
ÁÁÁÁÁ
ÁÁÁÁÁ
2
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
Place the aircraft between 5 and 10
°
pitch up.
ÁÁÁÁÁ
ÁÁÁÁÁ
ÁÁÁÁÁ
3
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
Note the radar display. If it is correctly stabilized, there
is very little change in the ground returns.
ÁÁÁÁÁ
ÁÁÁÁÁ
ÁÁÁÁÁ
4
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
If the display of ground returns resembles figure 5–26,
the radar is understabilized.
ÁÁÁÁÁ
ÁÁÁÁÁ
5
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
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