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190-00906-01 GTX 23 Installation Manual
Rev. C Page 3-2
3.4 Backshell Assembly
The GTX 23 connector kit includes one Garmin backshell assembly. Garmin’s backshells give the installer
the ability to quickly and easily terminate shield grounds at the backshell housing.
Refer to Appendix B for Shield Block Installation Instructions.
3.5 Weight and Balance
Weight and balance computation is required after the installation of the GTX 23. Follow the guidelines as
established in AC 43.13-1B, Chapter 10, Section 2. Make appropriate entries in the equipment list
indicating items added, removed or relocated along with the date accomplished. Include your name and
certificate number in the aircraft records. Section 1.7.1 identifies the weight of the new GTX 23
equipment and the drawings in Appendix D shows the center of gravity.
3.6 Electrical Load Analysis
An electrical load analysis should be completed on each aircraft prior to installation in accordance with
AC43.13-1B, Chapter 11. Use the following values for computation:
Table 3-2 Recommended Crimp Tools (High Density)
Manufacturer
(note 1)
Hand Crimp-
ing Tool
18-20 AWG 22-28 AWG
Positioner
Insertion/
Extraction Tool
(note 2)
Positioner
Insertion/
Extraction
Tool
Military P/N M22520/2-01 N/A M81969/1-04 M22520/2-09 M81969/1-04
Positronic 9507-0 9502-11 M81969/1-04 9502-4 M81969/1-04
AMP 601966-1 N/A 91067-1 601966-6 91067-1
Daniels AFM8 K774 M81969/1-04 K42 M81969/1-04
Astro 615717 N/A M81969/1-04 615725 M81969/1-04
1) Non-Garmin part numbers shown are not maintained by Garmin and consequently are subject to
change without notice.
2) Extracting the #18 or #20 contact requires that the expanded wire barrel be cut off from the contact.
It may also be necessary to push the pin out from the face of the connector when using an extractor due
to the absence of the wire. A new contact must be used when reassembling the connector.
Table 3-3 Unit Power Loads
GTX 23 Input
14 Vdc 28 Vdc
Typical Max. Typical Max.
GTX 23 Main Power 1.6 A 3.1 A 0.85 A 1.6 A