Garmin G5 Installation Manual page 240

C.3.2 G5 Tool Setup Procedure and operation
Before beginning the survey, ensure that all items listed on the test sequence are in their pre-exercise
states (e.g. control surfaces neutral, flaps up, lights off). Perform the survey by completing the following
steps.
1. Power up the aircraft (master switch, avionics bus, etc.).
2. Connect the test harness to the G5 with a battery installed and an 8-36 VDC/350mA limited
power supply as shown in Figure 6-24 above.
3. Turn the G5 on in configuration mode.
4. Navigate to the "Magnetometer" page.
5. Select "Interference Test...".
6. Follow the instructions displayed on the G5.
7. Select "Start" on the G5.
8. Perform each exercise on the survey sequence sheet. Perform each exercise at its specified
elapsed time and for its specified duration. This will help ensure correct identification of
magnetic field deviation sources after the survey is complete.
9. Monitor the magnetic field deviation percentage throughout the survey. If deviation levels exceed
thresholds, mark the survey sequence exercises during which these deviations occurred.
10. When all exercises in the survey sequence have been completed, the G5 status page will display
the worst case percentage of magnetic interference and the time stamp at which it occurred.
C.4 G5 Data Analysis
The G5 status page will display a "Test status:" of either "Pass" or "Fail" and the worst case percentage
of magnetic interference and the time stamp at which it occurred. Use this time stamp in conjunction
with the completed survey sequence to conclude which item created the highest magnetic interference.
If the test passes, then the location chosen for the test is a valid candidate for mounting the GMU 11. No
further testing is required.
If the test fails, the location chosen for the test should be considered unreliable until the source of
magnetic interference is identified and remedied. Compare the corresponding timestamp with the
prepared test sequence to identify which action produced the problem. If the source of the magnet
interference is not able to be identified or remedied, a new location for testing should be chosen. Repeat
the test until a suitable location is found.
Garmin G5 Electronic Flight Instrument Part 23 AML STC Installation Manual
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Page 240
190-01112-10
Rev. 21