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PRIMUS
r
880
Digital
W
eather
Radar
System
A28-1146-102-00
Radar Facts
5-29
ROLL GAIN ADJUSTMENT
This in-flight adjustment is made in a bank when the ground returns do
not remain symmetrical during turns. The procedure is listed in table
5-9.
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 Select STAB (STB) 4 times within 3 seconds. A
display with text instructions is shown.
7 From the roll offset entry menu, push the STAB (STB)
button twice more to bring up the roll gain entry menu.
8 To change the roll gain value, pull out the GAIN knob
and rotate it. The roll gain adjustment range is from 90
to 110%.
9 While flying with a steady roll angle of 10 to 20°, adjust
for symmetrical display of ground returns.
10 When change is completed, push in the GAIN knob.
The display returns to the previous message.
11 Push the STAB (STB) button to go to the next menu
(pitch gain).
Roll Gain Adjustment
Table 5-9