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G1000 System Maintenance Manual
Page 7-9
190-00903-00
Rev.
A
Marker Beacon Test
Figure 7-2. Marker Beacon Symbology
Using a ramp tester, simulate the outer marker, middle marker and inner marker signals by
following the test equipment manufacturer’s instructions. Verify that each marker audio signal
is present over the headphones and speaker. Verify that the outer, middle, and inner
annunciations appear on the PFD when the corresponding signal is applied. Marker beacon
annunciations appear at the upper left corner of the altitude indicator on the PFD as shown in
Figure 7-1. Operate the MKR MUTE key on the GMA 1347D and ensure that the audio signal is
muted.
7.1.5
GRS 77/GMU 44
Original GRS 77 Reinstalled:
If the original GRS 77 is reinstalled, no software loading is required. This does not include units
that were returned for repair as their software and configuration files are deleted during the
repair testing process.
Original GRS 77s Installed in Opposite Locations for Troubleshooting:
No software loading or calibration is required if the original GRS units are installed in opposite
locations (GRS #1 and GRS #2 in opposite unit racks) for troubleshooting.
New or Repaired GRS 77 Installed:
If a new or repaired GRS 77 is installed, load the following file after removing the Supplemental
Database cards from the bottom slots of each display. Note which card was removed from the
MFD so it may be identified later for reinsertion in the MFD when software and configuration
loading is complete. It contains a FliteChart or Chartview database which is only used by the
MFD. Reinstall all the cards after the software and configuration file loads are complete.
