Page 3-6 G3X Installation Manual – GMU 44Revision E 190-01115-013.8 Mounting InstructionsAfter evaluation of the mounting location has been completed and ensuring that requirements are met,assemble the GMU 44 mounting plate kits according to the dimensions given in Appendix D. Install theunit assemblies.Mount the GMU 44 to its mounting plate, 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 theGMU 44. Do not use a screwdriver that contains a magnet when installing or servicing the GMU 44.The metal components in the GMU 44's connector may slightly affect the magnetic field sensed by theGMU 44. Place the connector at least 2 inches from the body of the GMU 44 to minimize this effect.After attaching the GMU 44's connector to its mate in the aircraft wiring, secure the connector in placeusing good installation practices. This will ensure that any remaining magnetic effect can becompensated for using Calibration Procedure C: Magnetometer Calibration (Section 8.3.3).NOTEIf the GMU 44 is ever removed, the anti-rotation properties of themounting screws must be restored. This may be done by replacing thescrews with new Garmin PN 211-60037-08. If original screws must bere-used, coat screw threads with Loctite 242 (blue) thread-lockingcompound, Garmin PN 291-00023-02, or equivalent. Important:Mounting screws must be brass.3.9 MaintenanceMaintenance of the GMU 44 is ‘on condition’ only. Periodic maintenance of the GMU 44 is not required.