Installation Instructions

190-01007-A3 GTN 6XX/7XX AML STC Installation Manual
Rev. 4 Page 3-31
3.6.5.1.2 TVS2 Fabrication
1. Cut the TVS leads to 0.75+0.00/-0.10 inches on both sides.
2. Crimp and solder each of the four TVS banded side (cathode) leads to their connector specific
sockets (refer to Figure 3-10), and insert into the 4-pin connector with sockets.
3. Install heat shrink around the four TVSs – this will help to hold them in place during the
following steps.
3.6.5.1.3 TVS2 Assembly Build
Refer to Figure 3-11 while completing the following steps.
1. Solder the four leads at the anode (ground) end of the assembly onto a length of 18 AWG wire.
Attach a terminal lug onto the wire end.
2. Attach an appropriately sized piece of heat shrink to cover the soldered TVS leads and four TVS
pieces. A second appropriately sized (larger) piece of heat shrink should then be attached to
shrink over the 4-pin connector with sockets and back over the four TVSs. These two pieces of
heat shrink should overlap along the entire length of the TVSs.
3. Crimp and solder four 18 AWG wires to their connector specific pins, and insert them into the 4-
pin connector with pins.
4. Attach lengths of 18 AWG to both ends of the fuse and fuse holder assembly.
5. Splice the four wires from the connector with pins to one of the wires attached to the fuse
assembly.
6. Attach a terminal lug onto the 18 AWG coming from the other end of the fuse assembly.
7. Connect the two four-pin connectors together.
8. Ensure that the fuse is installed in the fuse holder.
3.6.5.1.4 TVS2 Assembly Polarity Check
Using a multimeter that is set to the diode mode, check conductivity across the entire TVS2 assembly. In
one direction, the meter should read open and in the other direction it should read 2.0 to 2.5 volts. When
installed in the aircraft, the TVS assembly should be oriented so that it does not normally conduct from
power to ground. The meter should indicate open when the red lead is attached to the power bus terminal
lug, and the black lead is attached to the ground terminal lug. The meter should indicate 2.0 to 2.5 volts
when the red lead is attached to the ground terminal lug, and the black lead is attached to the power bus
terminal lug.
3.6.5.1.5 TVS2 Assembly Installation
Refer to Figure E-4 while completing the following steps.
1. Attach the fuse (power) end of the TVS assembly to the power bus at the specific point detailed in
the drawing.
2. Attach the ground end of the TVS2 assembly to aircraft ground.