SV-ADAHRS-200/201 Installation and Configuration
5-22 SkyView System Installation Guide - Revision AA
AOA CALIBRATION
If a Dynon Avionics AOA/Pitot Sensor is installed, familiarize yourself with the AOA calibration
procedure before flight by reading through the instructions in the AOA Calibration Wizard:
SETUP MENU > HARDWARE CALIBRATION > ADAHRS CALIBRATION > AOA CALIBRATION.
Once you are flying straight and level at a safe altitude for stalls, go into the AOA Calibration
Wizard (IN FLIGHT SETUP MENU > AOA CALIBRATION…) and follow the onscreen instructions to
calibrate angle of attack while in flight.
ZERO PRESSURE IAS/AOA CALIBRATION
This calibration routine samples Pitot, Static, and AOA pressures in a windless environment to
allow SkyView to provide the best possible Indicated Airspeed (IAS) readings at very low
airspeeds, and the best possible Angle of Attack (AOA). Ideally, perform this calibration before
performing an (in-air) AOA calibration. After performing these two steps, in the future,
performing a ZERO PRESSURE IAS/AOA CALIBRATION should restore both airspeed and AOA
performance without requiring a full AOA calibration.
It is important that this calibration is done in an absolutely windless environment, such as a
closed hangar. Additionally, before performing this calibration, cover the Pitot, Static, and AOA
ports with a sock or cloth to minimize airflow WITHOUT putting any air pressure on the Pitot,
Static, or AOA ports.
Performing Pitot/Static Checks
Background
Dynon Avionics SV-ADAHRS-200/201 use airspeed in the calculation of attitude (or GPS ground
speed when airspeed is unavailable). The internal rate sensors are monitored and calibrated in
flight using feedback from the accelerometers and from airspeed to achieve a highly accurate
attitude solution.
When a pitot or static test is performed the sensors in the SV-ADAHRS-200/201 are being
exposed to dynamics that are impossible to achieve in a real aircraft flight environment,
namely, large airspeed changes without the accompanying accelerations and rotations. This
false condition will cause a well-calibrated unit to incorrectly adjust its calibration.
Furthermore, when a unit is in a test situation a change in applied pitot or static pressure will
cause the attitude to pitch up or down. This is expected.
Performing the following pitot and static test procedure to a Dynon Avionics SV-ADAHRS-
200/201 will prevent problems with the unit’s performance in flight.
Pitot/Static Test Instructions
Basic Principles
Ensure SkyView is warmed up during each test reading.
SkyView should be powered off when changing pressures.
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