What action should a pilot take when passing from the Standard Pressure Region into the Altimeter Setting Region?

When a pilot transitions from the Standard Pressure Region into the Altimeter Setting Region, it is crucial to obtain the current altimeter setting before entering the new airspace. This is vital for ensuring accurate altitude readings, which contribute to safe vertical separation from other aircraft and compliance with air traffic control requirements.

In the Standard Pressure Region, the altimeter is typically set to 29.92 inches of mercury, which corresponds to standard atmospheric pressure. However, when pilots enter the Altimeter Setting Region, local atmospheric pressure can vary, so it’s essential to use the current altimeter setting for that area. This setting is usually provided by air traffic control or obtained from nearby weather stations.

Setting the altimeter based on previous altitude does not account for local pressure variations and could lead to altitude distortions that may compromise safety during flight. Contacting ATC is also relevant, but the act of obtaining the most current altimeter setting ensures that the pilot can maintain their altitude in relation to other aircraft and terrain, maintaining safe operations within controlled airspace.