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PRIMUS
r
880
Digital
W
eather
Radar
System
A28-1146-102-00
Radar Facts
5-30
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 5-10.
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 25 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 20
NM.
5 On the WC controller, select variable gain (pull), WX
and REACT OFF. VAR shows on the display.
6 Push STAB (STB) 4 times within 3 seconds. A display
with text instruction is shown.
7 From the roll offset entry menu, push the STAB (STB)
button 3 more times to bring up the pitch gain entry
menu.
8 To change the pitch gain value, pull out the GAIN knob
and rotate it. The pitch gain adjustment range is from
90 to 110%.
9 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.
10 When change is completed, push in the GAIN knob.
The display returns to the previous message.
11 Push the STAB button to exit the mode and save the
value in nonvolatile memory.
Pitch Gain Adjustment
Table 5-10