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PRIMUS
R
660 Digital Weather Radar System
A28–1146–111
REV 2 7-1
In–Flight Adjustments
7. In–Flight Adjustments
PITCH AND ROLL TRIM ADJUSTMENTS
The PRIMUS
R
660 is delivered from the Honeywell factory or repair
facility adjusted for correct pitch and roll stabilization and should be
ready for use. However, due to the tolerances of some vertical
reference sources, make a final adjustment whenever the radar or
vertical reference is replaced on the aircraft, or if stabilization problems
are observed in flight.
The four trim adjustments and their effects are summarized in table
7–1.
Trim
Adjustment
Flight Condition
Effect On Ground
Return Display (Over
Level Terrain)
Roll offset Straight and level Nonsymmetrical display
Pitch offset Straight and level Ground displays do not
follow contour of range
arcs.
Roll gain Constant roll angle
>20°
Nonsymmetrical display
Pitch gain Constant pitch angle
>5°
Ground displays do not
follow contour of range
arcs.
NOTE: Generally, it is recommended to perform trim adjustments only if noticeable
effects are being observed.
Pitch and Roll Trim Adjustments Criteria
Table 7–1