Each system has its strength and its weakness, and characteristics. Western Avionics is quite familiar with these matters so don't hesitate to phone for help when something is crazy. For example there are KEA346 altimeters in Pilatus, Beech and Carvan aircraft in your fleets. This $21,240 altimeter is a Japanese servoed altimeter with very high reliability and one annoying weakness. It has a $3000 encoder that costs another $3000 to change out. And some of the production develops a most intermittent failure during climbs and descents. We know why. Talk to us - we'll save you money.