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PRIMUS
R
660 Digital Weather Radar System
A28–1146–111
REV 2 7-15/(7-16 blank)
In–Flight Adjustments
PITCH GAIN ADJUSTMENT
This in–flight adjustment is made in a bank when the ground returns do
not follow the contours of the range arcs during turns. The procedure
is listed in table 7–8.
Step Procedure
1 If two controllers are installed, one must be turned off. If an
indicator is used as the controller, the procedure is the
same as given below.
2 Fly to an altitude of 10,000 feet AGL or greater.
3 Set range to 50 NM.
4 Adjust the tilt down until a solid band of ground returns are
shown on the screen. Then adjust the tilt until the green
region of the ground returns start at about 40 NM.
5 Push STAB (STB) 4 times within 3 seconds. A display with
text instruction is shown.
6 From the roll offset entry menu, push the STAB (STB)
button 3 more times to bring up the pitch gain entry menu.
7 To change the pitch gain value, pull out the GAIN knob and
rotate it. The pitch gain adjustment range is from 90 to
110%.
8 While flying with a steady pitch angle of >5°, adjust so the
contour of the ground returns follow the contour of the
range arcs as closely as possible.
9 When change is completed, push in the GAIN knob. The
display returns to the previous message.
10 Push the STAB button to exit the mode and save the value
in nonvolatile memory.
Pitch Gain Adjustment Procedure
Table 7–8