Garmin GTP 59 GPS Receiver User Manual


 
G3X Installation Manual – GMU 44 Page 3-5
190-01115-01 Revision A
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 Description
Qty.
Included
GPN or MIL Spec
1
Shield Termination
(method optional)
0
Parts used depend on method
chosen
2 Shield Extension Wire 0 M22759/16-22
3, 4, 9 GMU 44 Connector Kit** 1 011-00871-00
5 3-Conductor Cable 0 M27500-22TE3T14
6 2-Conductor Cable 0 M27500-22TE2T14
**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 Garmin P/N Quantity Figure C-2.4 Ref
Screw,6-32x.250,PHP,BR,w/Nyl 211-60037-08 3 9
Conn,Circular,Female,9 Ckt 330-00360-00 1 4
Backshell,Circular,Kit,SS 330-90005-01 1 4
Cont,Sckt,Mil Crp,Size 20 336-00022-00 10 3
**Included in G3X Installation Kit (K10-00017-00)