PRIMUSr 880 Digital Weather Radar System
PITCH GAIN ADJUSTMENT
This in- flight adjustment is made in a bank 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 |
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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. |
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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 |
| are shown on the screen. Then adjust the tilt until the |
| green region of the ground returns start at about 20 |
| NM. |
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5 | On the WC controller, select variable gain (pull), WX |
| and REACT OFF. VAR shows on the display. |
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6 | Push STAB (STB) 4 times within 3 seconds. A display |
| with text instruction is shown. |
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7 | From the roll offset entry menu, push the STAB (STB) |
| button 3 more times to bring up the pitch gain entry |
| menu. |
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8 | To change the pitch gain value, pull out the GAIN knob |
| and rotate it. The pitch gain adjustment range is from |
| 90 to 110%. |
9 | While flying with a steady 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. |
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|
11 | Push the STAB button to exit the mode and save the |
| value in nonvolatile memory. |
| Pitch Gain Adjustment |
| Table 5- 10 |
Radar Facts | A28- 1146- 102- 00 |
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