Dme Functional Check - Garmin G1000 Nxi System Maintenance Manual

DME Functional Check

This check verifies that the DME-to-G1000 interface operates correctly.
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.
14. If no other service is to be performed, continue to the return-to-service checks in Section
9.
G1000 NXi System Maintenance Manual
King Air 300 Series
190-00716-N1
NOTE
Page 350
Revision 1