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PRIMUS
R
660 Digital Weather Radar System
A28–1146–111
REV 2 7-3
In–Flight Adjustments
Level Fight Stabilization Check
Follow the procedure in table 7–2 to determine if you need to perform
the roll offset adjustment.
Step Procedure
1 Trim the aircraft for straight and level flight in smooth, clear
air over level terrain at an altitude of at least 10,000 feet
AGL.
2 Select the 50–mile range and GMAP mode.
3 Adjust the tilt control until your radar display shows a solid
band of ground returns starting at the 40–mile range arc.
4 After several antenna sweeps, verify that ground returns
follow the range arc closely and are equally displayed on
both sides as shown in figure 7–1. If the ground returns are
not equally displayed on both sides (see examples in
figures 7–2 and 7–3), perform the roll offset adjustment
shown in table 7–3.
Stabilization in Straight and Level Flight Check Procedure
Table 7–2
NOTE: A condition where the strongest ground targets move from
side to side over a period of several minutes, can be caused
by the gyro erection circuits chasing a slow wingwalk in the
flightpath. Roll offset adjustment cannot compensate for this
condition.