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3.4 Weight and Balance
Weight and balance computation is required after the installation of the GTX 33. 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 1.5.1 identifies the weight of the new GTX 33 equipment
and Figure C-1 in Appendix C shows the center of gravity.
3.5 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:
GTX 33 Input
GTX 33 Main Power
3.6 Final Installation
For final installation and assembly, refer to the outline and installation drawings shown in Appendix C of
this manual.
1. Assemble the connector backshell as described in Section 3.3.
2. Attach the connector to the rear plate using the screws provided in the connector kit.
3. Mount the unit rack to the main system rack or other suitable mounting location using the provided
nutplates or installer supplied screws.
4. Assemble the rear plate into the GTX 33 unit rack using screws provided with the rear plate.
5. Insert the GTX 33 into the rack, noting proper orientation as shown on the installation drawing in
Appendix C.
CAUTION
Do not use excessive force when inserting the GTX 33 into the rack. This may cause
damage to occur to the connectors, unit, and/or unit rack. If heavy resistance is felt during
installation, stop! Remove the GTX 33 and identify the source of resistance.
6. GTX 33/33D Only: Lock the GTX 33/33D in place using the lever-locking handle. Fasten the han-
dle to the GTX 33/33D body using the provided Phillips screw. (Note that some early GTX 33/
33D units use a D-ring ¼-turn fastener)
CAUTION
Start the handle screw into the hole carefully, to avoid cross-threading. Do not apply
torque in excess of 14 in-lbs to the handle screw. The application of torque exceeding
14 in-lbs to the screw will damage the LRU case and/or retaining hardware.
7. GTX 33H/33DH Only: Lock the GTX 33H/33DH in place using the install screw. Tighten the
screw until the connectors are fully mated and the retaining wedge in the rack is fully mated with
the wedge attached to the unit. Tighten to the torque specification shown in Appendix C.
190-00906-00
Rev. F
Table 3-3. Unit Power Loads
14 VDC
Typical
Max.
1.6 A
3.1 A
28 VDC
Typical
Max.
0.85 A
1.6 A
GTX 33 Installation Manual
Page 3-5
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