What is required after the replacement of components connected to the pitot-static system?

When components connected to the pitot-static system are replaced, a leak test is necessary to ensure the integrity of the system. This is crucial because any leaks could compromise the accuracy of the airspeed indicator, altimeter, and vertical speed indicator, which all rely on stable pressure readings from the pitot-static system.

Conducting a leak test helps verify that there are no gaps or faults in the installation that could lead to erroneous instrument readings. This is typically achieved by applying a specific pressure to the system and monitoring that pressure for any drop, indicating a leak.

While a pressure check assesses the system's ability to hold pressure, it is the leak test that specifically targets the connections and components just replaced. A weight and balance check is relevant in many maintenance scenarios, but it is not directly related to the pitot-static system. Similarly, while functional testing of the instruments is important, it often follows after confirming that the system has no leaks. Therefore, the requirement after replacing components connected to the pitot-static system is the leak test to ensure operational safety and accuracy.