What altitude corresponds to an altimeter setting of 28.92?

To determine the altitude corresponding to an altimeter setting of 28.92 inches of mercury, it's important to understand that the altimeter setting indicates the atmospheric pressure at sea level. As the altimeter setting decreases, the altimeter will read a higher altitude than the actual altitude because it assumes that the air pressure is standard.

In the aviation context, standard atmospheric pressure at sea level is commonly set at 29.92 inches of mercury. Therefore, when the altimeter setting is lower than this standard value, such as at 28.92 inches, the aircraft's altimeter would show a higher altitude reading than the true altitude.

The difference in inches of mercury equates to changes in pressure, which can be converted into altitude using the rule of thumb that for every inch of mercury, an altitude change of approximately 1,000 feet occurs. In this case, a difference of 1 inch from the standard setting of 29.92 to 28.92 means a potential reading of about 1,000 feet higher than actual altitude.

Thus, if the aircraft is at an actual altitude around 1,500 feet, the altimeter would display about 2,500 feet under these conditions, leading to the conclusion that an