VAL Avionics NAV 2000 User's Guide download pdf (Page 159)

SkyView Pilot’s User Guide - Revision Q 8-1

8. Autopilot Operation

This chapter guides you through the functionality, symbology, and operation of the SkyView

Autopilot. It assumes that the Autopilot servos have been properly installed, calibrated, tested,

and tuned according to the procedures in the SkyView System Installation Guide. For

instructions on how to change Autopilot controls see the SkyView System Installation Guide.

Autopilot Safety Features

Servo Failsafe

The Dynon Avionics Autopilot is designed with multiple failsafe features to ensure that the

autopilot can always be disabled, even in the event of electronic or mechanical failure.

First, the required disconnect switch commands the servos to disengage directly, ensuring that

the pilot can always override SkyView’s commands.

Next, the Autopilot servos are designed so that the pilot can always overpower them and move

the control stick/yoke manually with minimal force, even when the servo is operating at its

highest torque output capability.

When the servos are not receiving power, they revert to their normal power-off state. Thus,

simply opening the Autopilot circuit breaker or fuse on in the aircraft will completely inhibit the

Autopilot servos from controlling the airplane.

However, SkyView does continuously look for the presence of powered-up servos, even when

the autopilot is disengaged, and will show an error condition if they are not communicating

with the rest of the system. Therefore, Dynon Avionics recommends that the servos be

powered on whenever SkyView is powered on in routine operation. When the servos are

receiving power but the autopilot is not engaged, the servos draw negligible power.

Finally, in the unlikely event of an internal catastrophic failure of the servo, moderate but firm

force on the control/stick yoke will physically decouple the servo internals from its link to the

aircraft control surface. This action breaks a specially-designed shear screw which is designed to

yield in this scenario to preserve positive pilot control of the aircraft.

Level Mode

The autopilot’s Level Mode (or Straight and Level Mode) will immediately attempt to reach zero

vertical speed and a roll angle of zero. It will not attempt to fly the aircraft to any previous

altitude or track and it will not respect any bug inputs. When activated, Level Mode will cause

the autopilot to engage if it was not already engaged.

Level mode can be activated in two ways:

 The LEVEL Autopilot menu button as described in the following sections.

 An optionally-installed external Level button (see the SkyView System Installation Guide

for connection details)

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VAL Avionics NAV 2000 User's Guide Page 159