Garmin G5 Electronic Flight Instrument Part 23 AML STC Maintenance Manual 190-01112-11
Rev. 7
Page 43 of 54
the installation or before changing the physical location, perform a Magnetometer Interference
Check in Section 7.5.3 to verify interference is not causing the error.
7. If necessary, modify the installation to rotate the GMU 11 by the amount calculated in the
previous step. When looking down at the GMU 11, rotate clockwise for positive values, and
counterclockwise for negative values.
After physically correcting the GMU 11 installation, repeat the procedures in Section 7.8.1 and Section
7.5.3 and this section.
7.7 Altimeter System Test
If the G5 unit is replaced, in aircraft that are IFR certified, perform an altimeter system test of the G5 in
accordance with 14 CFR Part 43 Appendix E.
7.8 GMU 11
If the GMU 11 is removed and reinstalled or removed and replaced, the procedure in 7.5.3 must be
conducted.
7.8.1 Magnetometer Interference Check
This check is to be used as necessary to help troubleshoot GMU 11 discrepancies that may be related to
interference or when a GMU 11 is moved and the new mounting location needs to be verified for
acceptable interference levels.
With the G5 in configuration mode, initiate the magnetometer interference test procedure by performing
the following steps:
NOTE
All selections made in configuration mode in this section are made on the G5 ID strapped as #1.
In a single G5 installation, Unit ID #1 is always the single G5 unit. In a Dual G5 installation,
Unit ID #1 is the G5 in the Attitude or Turn Coordinator position.
1. Select the “Magnetometer” page group on the G5 #1
2. Select the “Interference Test…” page.
3. Follow the instructions on each page displayed on the G5. Select “Next” to cycle through the
pages and “Back” to go to the previous page.
NOTE
The last page instructs the operator to prepare a detailed test sequence list with precise start and
stop times for exercising all electronic devices. Only the electronic devices that are likely to affect
the operation of the GMU 11 magnetometer need be included in the test sequence. The list of
relevant electronic devices varies from aircraft to aircraft. An example survey sequence form is
located in APPENDIX D .
4. Select “Start” to begin the test procedure.
5. The operator should carry out the actions called for in the prepared test sequence.
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