Avionics Report

August 1998 Issue

Watch That Altitude

Three inexpensive electronic watchdogs that keep track of altitude excursions and nag you to put the gear down.

Elbert D. Botts decided that white lines painted on the surface of the road werenít effective at night or in the rain, so he invented Bottsí Dots: Raised pavement marker dots that separate highway lanes. The rumble of tires they create is supposed to alert you if you wander out of your chosen lane.

Thatís the principle behind altitude alerting systems. You dial a target altitude into the device and it beeps or chimes if you wander off your assigned altitude. Big-dollar jets and sophisticated autopilots have this feature as standard equipment and itís usually is part of an altitude pre-select system. (See sidebar, page 20.)

For the rest of us, thereís the Icarus AltAlert 3070G,...

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