Consideration For Wing Grounded Lighting Fixtures; Mounting Instructions - Garmin G3X Touch Installation Manual

14.4.1 Consideration for Wing Grounded Lighting Fixtures

The following installation practices are recommended if the GMU 11 is mounted in the wing.
The wing tip lights should not have a power ground referenced to the chassis of the light assembly that
would then be referenced back to the airframe ground via the light assembly mounting.
A dedicated power ground should be used and returned as a twisted pair with the power source back into
the fuselage for a wing mounted GMU 11.
These installation practices will prevent magnetically interfering currents from flowing in the wing skin
that encloses the GMU 11. Electrically isolating the light assembly should not be used as an alternative to
the preceding consideration, unless the isolated light assembly has been analyzed for adequate protection
against direct attachment of lightning.
Refer to Section 14.5 for outline and installation drawings.

14.4.2 Mounting Instructions

After evaluation of the mounting location has been completed and ensuring that requirements are met,
install the unit assemblies.
Mount the GMU 11 in its mounting location, taking care to tighten the mounting screws firmly. Use of
non-magnetic tools (e.g. beryllium copper or titanium) is recommended when installing or servicing the
GMU 11. Do not use a screwdriver that contains a magnet when installing or servicing the GMU 11.
Refer to Section 14.5 for outline and installation drawings.
190-01115-01
Rev. AC
G3X/G3X Touch Installation Manual - GMU 11 Installation
Page 14-4