Roll Stabilization Check; In--Flight Roll Offset Adjustment Procedure - Honeywell Primus 880 Pilot's Manual

ROLL STABILIZATION CHECK

You can make an in- flight adjustment when level flight stabilization
errors are detected. This procedure is done by either the WC- 880 or
WC- 884 Weather Radar Controller or the WI- 880 Weather Radar
Indicator. During this procedure, described in table 5- 7, the GAIN
control acts as roll offset control. After the procedure the GAIN control
reverts to acting as a gain control.
Step
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 above ground level
(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 RCT OFF.
6 Select STAB (STB) 4 times within 3 seconds. A
display with text instructions will be displayed. See
figure 5- 23. The radar unit is in the roll offset
adjustment mode.
7 Pull out the GAIN knob to make a roll offset
adjustment. See figure 5- 24 for a typical display. The
offset range is from - 2.0°to +2.0°and is adjustable by
the GAIN knob. The polarity of the GAIN knob is such
that clockwise rotation of the knob causes the antenna
to move down when scanning on the right side.
8 While flying straight and level, adjust the GAIN knob
until ground clutter display is symmetrical.
9 Push in the GAIN knob. When the GAIN knob is
pushed in, the display returns to the previous
message.
In- flight Roll Offset Adjustment Procedure
A28- 1146- 102- 00
PRIMUSr 880 Digital Weather Radar System
Procedure
Table 5- 7 (cont)
Radar Facts
5-25