What is the main concern when using tools inside a pitot-static system?

The primary concern when using tools inside a pitot-static system is the possible obstruction of sensing holes. The pitot-static system relies on its sensing holes to accurately measure dynamic and static pressures, which are crucial for the aircraft’s speed, altitude, and other important flight parameters.

If foreign objects, debris, or even the tools themselves obstruct these holes, it can disrupt airflow and pressure readings. This obstruction can lead to erroneous instrument readings that can affect the aircraft's performance and safety. Therefore, ensuring that the sensing holes remain clear and free from obstruction is vital for the accurate operation of the pitot-static system.

Other possible concerns, such as incorrect installation or damage to electrical components, while relevant in a general maintenance context, do not pertain specifically to the direct impact on the core function of the pitot-static system. Similarly, loss of pressure calibration is less about the immediate concern of obstruction during tool usage and more about broader maintenance practices.