Gmu 11 Mounting In Nonmetallic Wingtip - Garmin G5 Installation Manual

- GMU 11 MOUNTING IN NONMETALLIC WINGTIP

D.1 Overview
In some installations it is desirable to mount the GMU 11 magnetometer in the wingtip of a metal
aircraft that has non-metallic (e.g. fiberglass) wingtip covers. If this is the case, the following
requirements must be met:
•
The aircraft must have wingtip navigation lights installed.
•
Heavy overbraid must be installed over the wiring from the GMU to the entry into the wing.
•
The overbraid must be terminated at this wing entry point using a #10 terminal lug and stud.
•
The GMU 11 must be mounted to a metal rib that does not enclose a fuel bay.
•
There must be at least one intermediate rib between the rib that encloses the fuel bay and the rib
on which the GMU 11 is installed.
•
The GMU 11 mounting bracket must be electrically bonded to the wing using fasteners or rivets.
D.2 Materials Required but Not Supplied
The following materials (or equivalents) are required to install the GMU 11 in a non-metallic wingtip:
•
Tinned copper flat braid, 1/4", QQB575F36T0250
•
Electrical tie-down strap, adjustable, MS3367-{1, 2, or 7}-X
•
Terminal lug, #10, insulated, MS25036-108
•
Terminal stud, #10
•
Terminal lug, #8, insulated, MS25036-153
D.3 Overbraid Fabrication and Installation
The length of overbraid required is approximately equal to the length of the GMU 11 service loop
(measured from the wing rib to the collar of P111) plus 4 inches.
Refer to Figure 6-25 and Figure 6-26 while completing the following overbraid installation procedure:
NOTE
It is recommended this procedure is completed prior to terminating wires to connector P111. If
this procedure is completed before assembly of P111, proceed to step 3.
1. Disconnect P111 from the GMU 11.
2. De-pin wires from P111 to facilitate placing overbraid over wire bundle.
3. Slide the overbraid over wire bundle extending from wing rib.
4. Terminate the end nearest the metal wing rib with the overbraid in accordance with one of the
two methods in Section D.3.1 using a #8 terminal lug.
5. Secure the overbraid pigtail to the shield block of P111 when assembling P111 (Refer to Section
4.2.3).
6. Terminate the end nearest the GMU with the overbraid in accordance with one of the two
methods in Section D.3.1 using a #10 terminal lug.
7. Secure the overbraid pigtail to a #10 terminal stud. Refer to Section D.3.2 for stud location
instructions.
Garmin G5 Electronic Flight Instrument Part 23 AML STC Installation Manual
Page 241
190-01112-10
Rev. 21