Mechanical altimeters, though ingenious, are barometers susceptible to various inherent errors arising from their internal mechanics (e.g., wear, scale, installation, hysteresis) and how they react to ...

The thing is, all altimeters work off barometric pressure. That’s how the gadgets know you’re going up or down changing air pressure as you ascend or descend pushes in or pulls out a tiny membrane ...

A three-day National Transportation Safety Board hearing on the deadliest U.S. aviation accident in decades dug into problems with altimeters,... Three days of hearings held by federal investigators ...

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