190-02081-03
GFC 600H HFCS Part 27 STC Maintenance Manual
Rev. 3
Page 6-24
6.5 GMU 44( ) Magnetometer
NOTE
Any removal, re-installation, or replacement of the GMU 44( ) requires a magnetic
interference test and recalibration of the AHRS (GRS 79H or GSU 75H and GMC 605H).
Additionally, any removal or addition of electrical components or ferrous materials within
10 feet of the GMU 44( ) will require recalibration of the AHRS units.
NOTE
Do not use magnetic tipped tools for servicing the magnetometer.
The GMU 44( ) is installed on frame bearing 5 in the rotorcraft tail boom. It is mounted on top of existing
flux valve support or using a universal mount (Garmin P/N 011-01779-01). Figure 6-13 and Figure 6-14
show mounting of the GMU 44. The GMU 44B’s location is identical and its installation details are shown
in Figure 6-15.