PRIMUSr 880 Digital Weather Radar System
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 |
| Procedure |
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1 |
| If two controllers are installed, one must be turned off. |
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| If an indicator is used as the controller, the procedure |
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| is the same as given below. |
2 |
| Fly to an altitude of 10,000 feet above ground level |
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| (AGL), or greater. |
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3 |
| Set range to 25 NM. |
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4 |
| Adjust the tilt down until a solid band of ground returns |
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| are shown on the screen. Then adjust the tilt until the |
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| green region of the ground returns start at about 20 |
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| NM. |
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5 |
| On the WC controller, select RCT OFF. |
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6 |
| Select STAB (STB) 4 times within 3 seconds. A |
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| display with text instructions will be displayed. See |
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| figure 5- 23. The radar unit is in the roll offset |
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| adjustment mode. |
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7 |
| Pull out the GAIN knob to make a roll offset |
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| adjustment. See figure 5- 24 for a typical display. The |
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| offset range is from - 2.0°to +2.0°and is adjustable by |
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| the GAIN knob. The polarity of the GAIN knob is such |
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| that clockwise rotation of the knob causes the antenna |
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| to move down when scanning on the right side. |
8 |
| While flying straight and level, adjust the GAIN knob |
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| until ground clutter display is symmetrical. |
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9 |
| Push in the GAIN knob. When the GAIN knob is |
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| pushed in, the display returns to the previous |
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| message. |
| In- flight Roll Offset Adjustment Procedure | |
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| Table 5- 7 (cont) |
A28- 1146- 102- 00 | Radar Facts |
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