System Maintenance Manual

G1000/GFC700 System Maintenance Manual – C90A/C90GT/C90GTi King Air Page 7-43
190-00682-01 Revision F
7.15 TAWS Functional Check
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-B”.
NOTE
If TAWS has not been enabled, the title will read “MAP – TERRAIN PROXIMITY” or “MAP
– TERRAIN”. Refer to section 3.9.7 for TAWS Configuration for configuring TAWS.
3. Press the GCU MENU button and select “Test TAWS” 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.
5. Press the GCU MENU button again and select “Inhibit TAWS” from the pop-up menu and press
ENT on the GCU. Verify “TAWS INHB” is displayed on PFD 1, PFD 2 and MFD.
6. Press the GCU MENU button again and select “Enable TAWS” from the prop-up menu and press
ENT on the GCU. Verify the “TAWS INHB” annunciation on the PFDs and MFD has
extinguished.
7. With a GPS position acquired, shield or disconnect the GPS antennas to remove the GPS signal.
Verify “No GPS Position” shows on the MFD and the “TAWS N/A” and “LOI” annunciations
show on the PFDs.
8. Reconnect or remove the shield from the GPS antennas, and verify the MFD “No GPS Position”
and PFD “TAWS N/A” and “LOI” annunciations are removed once the GPS satellites are
acquired.
9. Pull PFD1 PRI and PFD1 SEC circuit breakers. Re-power PFD1 in configuration mode, and use
the PFD1 FMS knob to select the Audio Alert Configuration page.
10. Ensure cockpit speaker is selected ON. Use the PFD1 FMS knob to highlight each of the
following messages then select PLAY. Verify each of the following audio messages can be
played:
Caution Obstacle (2x) Pull-Up
Caution Terrain (2x) Sink Rate
Don’t Sink Terrain Ahead, Pull-Up (2x)
Obstacle Ahead (2x) Terrain Ahead (2x)
Obstacle Ahead, Pull-Up (2x) Too Low, Terrain
Obstacle (x2); Pull-Up (2x) Terrain (2x); Pull-Up (2x)
Five Hundred
11. Pull the PFD1 PRI and PFD1 SEC circuit breakers, and re-power PFD1 in normal operating
mode.
If no other service is to be performed, continue to the return-to-service checks in Section 8.