Avionics Report

February 2012 Issue

Compass Replacement: Two Viable Options

Precision’s proven PAI-700 offers an easy-to-steer presentation. The drawback is the finicky installation where a mistake can render it useless.

Mag compasses live hard lives. They bake in the sun-splashed heat of the windscreen. They sustain endless amounts of airframe vibration, which not only makes them a challenge to read with accuracy but also contributes to ultimate failure. You probably don’t think much about the compass in your aircraft until it spews its fluid all over the instrument panel and you realize FAR 91.205 requires you to fix it. Replacement options are slim and while a vertical card model is considered a step above the traditional whiskey design, installation technique is critical, and surprisingly expensive.

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