Gsu 73/Gmu 44 Interconnect Harness Fabrication Instructions - Garmin GDU 370 Installation Manual

3.6.1 Consideration for Wing Grounded Lighting Fixtures
The following installation practices are recommended if the required GMU 44 mounting bracket is
located in the wing.
1. 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.
2. 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 44.
These installation practices will prevent magnetically interfering currents from flowing in the wing skin
that encloses the GMU 44. Electrically isolating the light assembly should not be used as an alternative to
item 1 above, unless the isolated light assembly has been analyzed for adequate protection against direct
attachment of lightning.
Refer to Appendix C for outline and installation drawings.

3.7 GSU 73/GMU 44 Interconnect Harness Fabrication Instructions

Table 3-8 lists parts needed for the GMU 44 interconnect harness. Some of the parts for installation are
included in the GMU 44 Connector Installation Kit. Other parts are provided by the installer. Reference
numbers refer to item bubble numbers shown in Figure C-2.4.
Table 3-8. Parts Needed for GMU 44 Installation
Figure B-2.4 Ref
1
2
3, 4, 9
5
6
**Included in G3X Installation Kit (K10-00017-00)
Table 3-9 lists material in the GMU 44 connector kit and the associated reference number, as shown in
Figure C-2.4. The GMU 44 magnetometer has an attached pigtail with male polarity. The harness
connector for the GMU 44 has female polarity.
Table 3-9. GMU 44 Connector Kit (011-00871-00)** Contents, Reference Figure C-2.4
Item
Screw,6-32x.250,PHP,BR,w/Nyl
Conn,Circular,Female,9 Ckt
Backshell,Circular,Kit,SS
Cont,Sckt,Mil Crp,Size 20
**Included in G3X Installation Kit (K10-00017-00)
G3X Installation Manual – GMU 44
190-01115-01
Description
Shield Termination
(method optional)
Shield Extension Wire
GMU 44 Connector Kit**
3-Conductor Cable
2-Conductor Cable
Garmin P/N
211-60037-08
330-00360-00
330-90005-01
336-00022-00
Qty.
GPN or MIL Spec
Included
Parts used depend on method
0
0 M22759/16-22
1 011-00871-00
0 M27500-22TE3T14
0 M27500-22TE2T14
Quantity
3
1
1
10
chosen
Figure C-2.4 Ref
9
4
4
3
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Revision A