Garmin G1000 Nxi System Maintenance Manual page 358

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Obstacle Ahead (2X)
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Obstacle Ahead, Pull Up (2X)
11. Pull the PFD1 PRI and PFD1 SEC circuit breakers, and re-power PFD1 in normal
operating mode.
12. If no other service is to be performed, continue to the return-to-service checks in Section
9.
Functional Check for TAWS-A
1. With the G1000 in Normal Mode, use the GCU FMS knob to select the Map group and
TAWS page on the MFD.
2. Verify that the title at the top of the page reads "Map – TAWS-A Map".
If TAWS has not been enabled, the title will read "Map – Terrain Proximity"
or "Map – Terrain". Refer to Section 3.9.7 for enabling TAWS-A.
3. Press the GCU MENU button and select "Test TAWS System" from the pop-up menu.
Verify TAWS test annunciation is displayed on the MFD and both PFDs.
4. After the TAWS test has completed, verify that "TAWS System Test Okay" is heard over
the cockpit speaker (if selected) and the headsets.
5. Press the GCU MENU button again and select "Inhibit TAWS" from the pop-up menu
and press ENT on the GCU. Verify "TAWS INH" is displayed on PFD 1 and PFD 2.
6. Press the GCU MENU button again and select "Enable TAWS" from the pop-up menu
and press ENT on the GCU. Verify the "TAWS INH" annunciation on the PFDs has
extinguished.
7. Press the GCU MENU button again and select "Inhibit GPWS" from the pop-up menu
and press ENT on the GCU. Verify "GPWS INH" is displayed on PFD 1 and PFD 2.
8. Press the GCU MENU button again and select "Enable GPWS" from the pop-up menu
and press ENT on the GCU. Verify the "GPWS INH" annunciation on the PFDs has
extinguished.
9. Press the GCU MENU button again and select "Flap Override" from the pop-up menu
and press ENT on the GCU. Verify "FLAP OVR" is displayed on PFD 1 and PFD 2.
10. Press the GCU MENU button again and select "Disable Flap Override" from the pop-up
menu and press ENT on the GCU. Verify the "FLAP OVR" annunciation on the PFDs
has extinguished.
11. With a GPS position acquired, shield or disconnect the GPS antennas to remove the
GPS signal. Verify "LOI" shows on the MFD and the "TAWS N/A" and "LOI"
annunciations show on the PFDs.
12. Reconnect or remove the shield from the GPS antennas and verify the MFD "LOI"
indication and PFD "TAWS N/A" and "LOI" annunciations are removed once the GPS
satellites are acquired.
13. Pull the RADIO ALTM circuit breaker. Verify "GPWS FAIL" is displayed on PFD1 and
PFD2.
14. Reset the RADIO ALTM circuit breaker. Verify "GPWS FAIL" annunciations are
removed.
G1000 NXi System Maintenance Manual
King Air 300 Series
190-00716-N1
NOTE
Page 345
Revision 1