VAL Avionics NAV 2000 Guia de Instalação descarregar pdf (Página 269)

SkyView System Installation Guide - Revision R 15-1

15. Accessory Installation and Configuration

This chapter contains information regarding installation and configuration of various Dynon-

supplied accessories for the SkyView system.

Angle of Attack Pitot Probe Installation and Configuration

This section walks you through the general steps to install and calibrate both the heated and

unheated versions of the AOA/Pitot Probe. The heated probe consists of a heater controller

module and a probe while the standard version is a probe only.

While the probe senses standard pitot pressure, allowing it to work with any standard airspeed

indicator, its AOA functionality is designed specifically to work with Dynon’s EFIS series of

products. Do not expect it to work properly with another AOA system.

To ensure accuracy, it is very important that you install the probe correctly and

perform the specified calibration steps. We recommend that you read and

understand this entire section before proceeding with the installation.

Dynon’s Heated AOA/Pitot Probe is nickel-plated. Do not polish the probe as this

will cause the finish to come off.

AOA Calculation: Principles of Operation

Dynon Avionics’ AOA/Pitot probe performs two functions: airspeed sensing and angle of attack

sensing. These functions require two pressure ports on the tip of the probe. The normal pitot

pressure port is on the front face of the probe and is designed to be insensitive to angle of

attack. The second pressure port is located on an angled surface just under the pitot port and is

designed to be very sensitive to AOA. The SkyView system then uses the difference between

these two pressures to calculate the current angle of attack.

Heating: Principles of Operation

The heated version of Dynon’s AOA/Pitot Probe utilizes a nichrome heating element whose

temperature is accurately measured and regulated by the heater controller. This controller–

located in an enclosure which can be mounted in a wing or elsewhere–regulates the heat at the

tip of the probe to a constant temperature. There are several advantages to this: lower power

consumption, increased heating element lifespan, and a much cooler pitot on the ground when

de-icing is not necessary. This unique technique ensures that the pitot can be rapidly de-iced

when required, but does not needlessly waste electricity when not in icing conditions.

The probe operates at a fairly hot temperature. During normal operation, it

regulates its internal temperature to about 70°C to 80°C. You can verify nominal

operation by touching the end of the pitot farthest from the snout after one

minute of operation. It should be warm.

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VAL Avionics NAV 2000 Guia de Instalação Página 269