Garmin G1000 Nxi System Maintenance Manual page 340

GWX 68 or GWX 70 Functional Check
Operation of the GWX 68 or GWX 70 Weather Radar is accomplished using the MFD/GCU 477.
Refer to G1000 King Air 300 Series Cockpit Reference Guide, listed in Table 1-2, for basic
operation.
Before energizing the equipment, be sure microwave radiation safety
precautions including both fuel and personnel safety considerations have been
observed. These include clearing all personnel to an area beyond the
maximum permissible exposure level (MPEL) boundary. The MPEL for the
GWX 68 is 11 feet and the GWX 70 is 10 feet.
1. On the GCU, turn the large FMS knob to select the Map Page Group then turn the small
FMS knob to select the Map – Weather Radar page.
2. Select the Mode softkey.
3. Select the Standby softkey to initiate the one-minute warm-up period. Verify the radar
enters the standby mode after the warm-up is complete.
4. Select the Mode softkey.
5. Select the Weather softkey. After reading the CAUTION statement, turn the large FMS
knob to select YES. Press the GCU ENT key.
6. Select the STAB softkey to activate or deactivate antenna stabilization. Verify the current
stabilization condition is shown in the upper right of the weather radar display.
7. Select the Back softkey.
8. Select the Vertical softkey.
9. Select the Tilt softkey to activate the cursor in the Tilt field.
10. On the GCU, turn the small FMS knob to select the desired antenna tilt angle. Press the
GCU ENT key. Press the GCU FMS knob to remove the cursor.
11. Select the Gain softkey to activate the cursor in the Gain field.
12. On the GCU, turn the small FMS knob to adjust the gain for the desirable level. Verify
the gain setting is visible in the gain field as a movable horizontal bar in a flashing box
and the line pointer is a reference depicting the calibrated position. Press the FMS knob
to remove the cursor.
13. On the GCU, select the Gain softkey again to recalibrate the gain. Verify 'Calibrated' is
displayed in the Gain field.
14. Select the Mode softkey.
15. Select the Off softkey.
G1000 NXi System Maintenance Manual
King Air 300 Series
190-00716-N1
NOTE
Page 327
Revision 1