Magnetic Interference Survey - Garmin G5 Installation Manual

- MAGNETIC INTERFERENCE SURVEY

C.1 Introduction
The magnetic interference survey is used to identify a location within an aircraft with acceptable levels
of magnetic interference where the GMU 11 can be correctly installed. This appendix describes the
materials, precautions, setup, and procedures required to successfully conduct the magnetic interference
survey.
C.2 Required Materials
The following items are required to complete the magnetic interference survey.
DC Power Source
In order to perform the magnetic interference survey, it is required to use a DC power source capable of
supplying 8-36 VDC/350 mA to the G5 and GMU 11 magnetometer for test purposes.
G5
It is required to use a G5 to run the magnetic interference survey. If a G5 with charged battery attached
is used, the G5 does not need to be powered from the DC Power Source.
The GMU 11 will still need power from a DC Power Source. A good temporary power source would be
a 9 VDC battery.
Stopwatch or Watch with a Second Hand
During the survey test sequence, it is required to use a stopwatch, or watch with a second hand, in order
to measure the time for turning equipment on and off.
Magnetic Interference Survey Test Cable
In order to perform the magnetic interference survey, it is required to use a test cable fabricated by the
installer. Fabricate a test cable in accordance with Figure 6-24.
Garmin G5 Electronic Flight Instrument Part 23 AML STC Installation Manual
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Rev. 21