TM106601_(7/01) 2-
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(9) In step (7), if the terrain band shifts as shown decrease the tilt angle (using the TILT control) is
similar to Figure 2.9-1. Note the new position control. It should not be more than two
degrees in step (4).
(10) If the differences between steps (8) and (4) or steps (9) and (4) are greater than two degrees,
recalibrate the roll stabilization circuitry to the gyro using the following procedure:
(a) Reset the TILT control under the flight conditions of step (4) with stab on. Then roll the
aircraft 20° right.
(b) If the pattern shifts per Figure 2.9-2, slowly adjust the ROLL TRIM potentiometer on the
Radar Control Panel (recessed pot below SRCH button) until the terrain band display is as
shown in Figure 2.9-1. Usually a clockwise adjustment is required.
(c) If the pattern shifts per Figure 2.9-3, slowly adjust the ROLL TRIM potentiometer on the
Radar Control Panel (recessed pot below SRCH button) until the terrain band display is as
shown in Figure 2.9-1. Usually a counterclockwise adjustment is required.
(11) If the pattern shifts per Figure 2.9-4, there is no roll stabilization and the system should be
ground-checked per the post-installation tests of this manual, Paragraph 2.7.3, "Antenna
Stabilization Check".
2.8.2.3 Check Weather Alert Mode
(1) Rotate the Function Select Switch on the Radar Control Panel to the ON position, and adjust the
TILT control to obtain a strong red level ground return.
(2) Select the WXA mode by pressing the WXA button on the Radar Control Panel.
(3) Observe that the red area flashes on and off approximately once per second (the red areas will
flash if the MFD display has the ability to perform this function).
(4) Return the tilt control to the normal position.
2.8.2.4 Check Target Alert
(1) Select the WXA mode by pressing the WXA button on the Radar Control Panel.
(2) Locate a distant red level storm or adjust the TILT control down until a red level ground return
appears near the outer edge.
(3) Reduce the range until the red level return is off the screen, but not more than 25 miles beyond
the selected range.
(4) Observe that the word TGT ALRT flashes on the MFD display.
(5) Return the TILT control to the normal position.
