PRIMUS
r
880
Digital
W
eather
Radar
System
A28-1146-102-00
RadarFacts
5-30
PITCH GAIN ADJUSTMENT
Thisin-flight adjustmentis made in abank 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
1If two controllers are installed, one must be turned off.
If an indicator is used as the controller,theprocedure
is the same as given below.
2Fly to an altitude of 10,000 feet AGL or greater.
3Set range to 25 NM.
4Adjust the tilt down until asolid 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.
5On the WC controller,selectvariable gain (pull), WX
and REACT OFF.VARshows on the display.
6Push STAB(STB) 4times within 3seconds. Adisplay
with text instruction is shown.
7From the roll offset entry menu, push the STAB(STB)
button 3more times to bring up the pitch gain entry
menu.
8Tochangethe pitch gain value, pull out the GAIN knob
and rotate it. The pitch gain adjustment range is from
90 to 110%.
9While flying with asteady 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 Pushthe STAB button to exit the mode and save the
value in nonvolatile memory.
Pitch Gain Adjustment
Table5-10