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What causes altimeter settings to change from one airport to the next?
Wiki User
∙ 13y ago
altimeter settings change from one airport to another due to the fact that each airport is experiencing its own form of pressure. airports close together will most likely have the same altimeter setting give or take. airports that are farther apart will have a noticeable change in altimeter settings due to the fact that one may be in a high pressure area and one may be in a low pressure area. it all depends on the current weather.
Wiki User
∙ 13y ago
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In order to answer your question, first I will briefly explain how an altimeter works. An altimeter senses current atmospheric pressure, and converts it into an altitude reading. The lower the pressure, the higher altitude it will show. In aviation, the pilot needs to select the correct altimeter setting before takeoff and during flight in order to get a correct reading. This is required because the pressure at sea level changes based on weather conditions. For example, if I parked my aircraft at an airport, then came back the next morning, my altimeter would give me a different reading than before because the weather conditions changed slightly overnight. I would then have to change the altimeter to the current local altimeter setting. The local altimeter setting is defined as the atmospheric pressure at Mean Sea Level (MSL) in inches of mercury. Once the altimeter has the pressure at sea level, it can give an accurate reading of the current altitude. Air Traffic Control keeps pilots updated on the local altimeter settings as they fly. The other way to calibrate an altimeter, this only works on the ground, is to turn the pressure selector until the altimeter show the elevation of the airport you are currently at. At this point, the pressure shown is the local altimeter setting.
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