PRIMUS
r
880 Digital Weather Radar System
A28- 1146- 102- 00
Radar Facts
5-20
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.
Generally, it is recommended to perform trim adjustments only if
noticeable effects are being observed.
Pitch and Roll Trim Adjustments Criteria
Table 5- 4
NOTES:
1. Depending on the installation, not all of the
adjustments shown in table 5- 4 are available. If STAB
TRIM ENABLE programming strap is open, only the
roll offset adjustment is available. If STAB TRIM
ENABLE is grounded, all four adjustments are
available. Consult the installation configuration
information for details.
2. After any adjustment procedure is completed, monitor
the ground returns displayed by the radar during
several pitch and roll maneuvers. Verify that the
ground returns stay somewhat constant during
changes in aircraft orientations. If not, repeat the
adjustment procedure.
3. After the trim adjustment feature is selected, more
than one adjustment can be made. They are available
in the sequence shown in table 5- 4, and can be done
in the sequence of first finishing one adjustment, then
proceeding to do the next by pushing the STAB button.
Summary of Contents for Primus 880
Page 1: ......
