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Altimeters: Asked and Answered


In our last issue, we featured a question from WOA member Gennaro Avolio, WOA 551224, about the pointers on an altimeter that ride the outer edge of the display face.

Several readers responded via Facebook and e-mail, including Clyde Zellers, WOA 1393, who provides the answer.

And the answer is:

The little pointer shows tens of thousands of feet. We all know the big pointer shows hundreds of feet to within 20-foot increments. The smaller pointer shows thousands of feet, but the smallest pointer shows every 10,000 feet in increments. That would be the only way a pilot can see when they are at 15,000 or 23,000 feet.

So when the big pointer goes around once, the little pointer will be at 1 and the big hand on 0. But when the big pointer goes around 10 times, then the big hand is on 0, the little hand on 0 but the littlest hand on 1. Thereby showing 10,000 feet of altitude.

Just take the knob and keep turning it until the big hand goes around 10 times and you'll see the little bitty hand arrive at the 1 o'clock position.

By the way... it looks as though the altimeter on the right needs to be sent out to be recalibrated, as the littlest pointer is off for a 200-foot altitude setting.

Clyde Zellers, WOA 1393
Springfield, Illinois


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