Installation guide

Accessory Installation and Configuration
SkyView System Installation Guide - Revision R 15-5
recommendations for wire gauge choice, given wiring run length. It assumes 10 amps of
current.
Run length (in feet)
Gauge
0 to 7
18 AWG
7 to 9
16 AWG
10 to 16
14 AWG
17 to 24
12 AWG
25 to 40
10 AWG
Table 49–From FAA AC 43.13-1B, page 11-30
Probe to Controller Wiring
As mentioned above, it is preferable that the heater controller box be mounted near enough to
the probe that 5 wires between the controller and probe can be connected without extension.
The three mating pairs of colored wires–terminated with Fastons–are used to carry the current
to the heating element in the probe. The 2 white wires are for temperature measurement, and
can be small. If you have mounted the heater controller near the probe and do not need to
extend the wires between the two, simply plug each wire on the controller into its
corresponding like-colored wire from the probe.
If you do need to extend the wires between the probe and the controller, use the
recommended wire size (see Table 49) for your run length. Since extending the wire runs
requires that you cut the connectors off the 5 wires between the probe and controller, splice
the extension wires between the probe and controller using butt splices or other similarly
secure method. The white wires are not polarity-dependent. Additionally, as the white wires do
not carry any significant current, you may extend them with 26 AWG or larger for any run
length.
Controller Power Wiring
Three wires – colored red, black, and white – exit the controller for connection to your
electrical system. Power (between 10 and 15 volts DC) is fed to the controller via the red and
black wires. The maximum current draw of the heated pitot controller/probe is 10 amps. You
must route your own appropriately-sized wires to where the heater controller is mounted. Both
power and ground lines should be able to handle 10 amps with minimal voltage drop, as
recommended in Table 49.
The red wire should be connected through a pilot-accessible switch to the main power source
in the aircraft (limited to 15 volts DC). The switch allows you to manually turn the heater
controller on and off, depending on the situation. Install a 15 amp fuse at any point along the
power line to the heater controller. Remember that even when the controller is powered on, it
only heats the probe the amount necessary to maintain temperature.
The black wire should be permanently connected to ground. Cutting power to the heater
controller should occur via the red power line, not the black ground line.