G1000 / GFC 700 System Maintenance Manual - 300/B300 Series King Air Page 7-41
190-00716-01 Revision 4
7.20 DME Functional Check
This check verifies that the DME-to-G1000 interface operates correctly.
NOTE
Support for a single Collins DME-42 system is provided as an option in the G1000. If
the DME option is selected, the DME channel one audio level must be adjusted by the
procedure contained within Collins DME-42 Transceiver Repair Manual 523-0772458,
Maintenance Section 523-0772460-006118, to adjust DME channel one audio level.
Recommended nominal DME audio output level is 4.46 Vpp + 0.10 Vpp. Procedure must
be accomplished by an approved repair station.
1. If DME is not displayed, press the PFD softkeys on PFD1 and PFD2, then press the DME softkey.
Verify the DME window is displayed next to the PFD1 and PFD2 HSI.
2. On PFD1 and PFD2, press the BACK softkey then select DME softkeys. Verify the DME TUNING
screen is displayed.
3. On PFD1 and PFD2, use the large FMS knob to select the NAV1, NAV2 and HOLD modes in the
DME field. Verify that the NAV1, NAV2 and HOLD modes can be selected by turning the small
FMS knob.
4. Set NAV1 and NAV2 frequencies to 108.00 and 117.00 respectively.
5. On PFD1 and PFD2, select the DME NAV1 mode. Verify that the DME window display is set to the
NAV1 frequency of 108.00.
6. On PFD1 and PFD2, select the DME NAV2 mode by pressing the ENT softkey. Verify that the
DME window display is set to the NAV2 frequency of 117.00.
7. On PFD1 and PFD2, select the DME HOLD mode by using the FMS knob. Verify that the last
selected NAV frequency of 117.00 remains the same when the NAV2 frequency is changed. Deselect
DME HOLD.
8. On the NAV Test Set, set up a DME test and note the nav frequency. Tune NAV 1 to the test set
frequency and set PFD1 and PFD2 DME MODE to NAV1. Set NAV 2 to a frequency other than the
test set frequency.
9. Verify that the DME distance on PFD1 and PFD2 match the test set.
10. Select, or verify selected, DME and SPKR buttons on GMA1 and GMA2 audio panels to select the
DME audio and select speaker to ON. Verify that the DME audio can be heard over the cockpit
speakers.
11. On PFD1 and PFD2, set the DME mode to NAV2 and verify that the DME distance is dashed out.
12. Tune NAV 2 to the test set frequency. Set NAV 1 to a frequency other than the test set frequency.
13. Verify that the DME distance on PFD1 and PFD2 match the test set.
If no other service is to be performed, continue to the return-to-service checks in Section 8.
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