AP Servo Installation, Configuration, and Calibration
SkyView System Installation Guide - Revision AA 10-15
Connect the External LEVEL Button and/or the External GO AROUND Button to only one
display. The External LEVEL Button and/or the External GO AROUND Button will operate
for all displays in the SkyView system as long as the display the External LEVEL Button
and/or the External GO AROUND Button is wired to is powered on and operating
normally. As a non-flight-critical function, the loss of the External LEVEL Button or the
External GO AROUND Button in some display failures may be acceptable for your
installation.
o Use of the LEVEL function via the SkyView soft keys via any operating SkyView
display is still possible, as well as pushing the LEVEL button on the (optional) SV-
AP-PANEL.
o Use of the GO AROUND function via the SkyView soft keys via any operating
SkyView display is still possible, as well as pushing and holding the UP button on
the (optional) SV-AP-PANEL.
Install a diode for each individual display’s connection to the External LEVEL button
and/or the External GO AROUND button. The diode should be installed with the cathode
end (painted band on the diode) oriented towards the External LEVEL button, and
should be installed in-line with the contact wire between the SkyView display and the
External LEVEL button and/or the External GO AROUND button. One diode is needed per
button, per display. Any diode will work for this application. An example diode is the
very common 1N914, available from Radio Shack (P/N 276-1122). With a diode installed
for each display, the External LEVEL Button and/or the External GO AROUND button will
work correctly with any combination of displays powered on and powered off.
Use a multi-pole pushbutton (momentary, normally open / push to close) for the
External LEVEL Button and/or the External GO AROUND button. With this option, run
each display's connection to a different pole on the pushbutton. With the multi-pole
pushbutton installed, the External LEVEL Button and/or the External GO AROUND
Button will work correctly with any combination of displays powered on and powered
off.
Wire Sizing
While it is beyond the scope of this installation guide to advise on specific types of wiring for a
particular aircraft, choice of wiring should be sized to 1) minimize voltage drop over the length
of the particular wiring run, and 2) conduct the amount of current required by the subsystem
without the wiring becoming warm to the touch. Appendix C: Wiring and Electrical Connections
contains information and suggested resources for wiring and electrical connections. Generally,
20 AWG wire is a suitable gauge for the servo power / ground wires for lengths up to 20’ of
wire.
Wiring Installation
Care should be taken such that aircraft wiring is not subjected to chafing, excessive flexing, or
connections/junctions subjected to excessive vibration which may cause the
connection/junction to fail or short-circuit.
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