Under Pressure

QNH, ALSTG, low pressure, high pressure... The atmosphere exerts a highly variable pressure on us, but we need to accurately know that pressure to stay safe.

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Dialing in the altimeter setting is perhaps one of the most universal, timeless rituals of aviation, spanning decades, continents, and cultures, and tying all pilots to one another. This underscores the importance of atmospheric pressure and its effect on flight safety. But how much do you know about where those numbers come from? In this […]
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