What is the purpose of the static system in an aircraft?

The purpose of the static system in an aircraft is to provide static pressure for altitude indication and temperature readings. The static system consists of ports that measure the ambient atmospheric pressure surrounding the aircraft, which is then utilized by various instruments, such as the altimeter and the airspeed indicator, to provide accurate data regarding altitude and other flight parameters.

The altimeter relies on the differences in static pressure to determine the aircraft's altitude above sea level. This pressure data is crucial in ensuring the pilot has an accurate understanding of their flight altitude, which is essential for safe operation and navigation. Additionally, temperature measurements can also be derived from static pressure under certain conditions, helping inform the performance of the aircraft and its systems.

The other choices relate to different systems within the aircraft that serve distinct functions. For example, measuring airspeed involves the dynamic pressure from the air flowing into the pitot tube, which is separate from the static pressure measured by the static system. Additionally, hydraulic systems are part of the flight control mechanisms and not related to atmospheric pressure measurement. Similarly, electronic navigation relies on different technologies and systems that do not pertain to the static pressure measurements provided by the static system.