CPL Ground Theory Practice Exam 2025 – Complete Preparation Resource

The function of the altimeter in an aircraft is to measure altitude above mean sea level. This instrument is vital for pilots as it provides critical information about the aircraft’s current height relative to sea level, which is essential for maintaining safe flight operations, particularly during takeoff, landing, and navigation.

The altimeter works based on changes in atmospheric pressure; as an aircraft ascends or descends, the pressure changes, and the altimeter translates these changes into an altitude reading. Accurate altitude measurement helps pilots avoid obstacles, adhere to air traffic control regulations, and ensure safe separation from other aircraft.

Understanding this function is crucial for effective flight management, as altitude affects everything from fuel efficiency to collision avoidance. Other functions listed, such as monitoring cabin pressure or indicating fuel levels, are handled by different systems and instruments, each serving distinct roles in overall aircraft operation.