Avionics Report

May 2015 Issue

Aspen AoA Upgrade: Self-Contained, Simple

Aspenís new software-based angle-of-attack system uses AHRS, air data and GPS input. This eliminates mechanical sensors and a complex installation.

The way we see it, all PFD (primary flight display) systems should include angle-of-attack sensing and display as a standard function. After all, nearly all of the data thatís required for computing a stalled condition can be acquired from the PFDís air data computer and AHRS sensor.

This is partly how Aspen Avionics is adding angle-of-attack functionality to its Evolution PFD and MFD displays. By throwing aircraft-specific programmable software in the mix, the Evolution AoA system is able to compute stall condition for wing flap configurations without referencing an external flap position sensor.

The result is a simple AoA upgrade that doesnít require the costly installation of additional sensors, other than what is already included in an Aspen PFD/MFD setup.

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