Why should you avoid cleaning obstructions from the sensing holes in a pitot-static system with a tool?

The correct answer highlights that the sensing holes in a pitot-static system are aerodynamically critical. These holes play a vital role in the accurate measurement of airspeed, altitude, and vertical speed. Any alteration to their shape, size, or orientation—whether from using a tool or other means—can disrupt the airflow through the system, leading to erroneous readings and compromising flight safety.

Maintaining the integrity of these holes is essential for the proper functioning of the air data system, as they are designed to capture pressure differences that are crucial for the instruments to provide reliable information. Therefore, caution must be exercised when addressing any obstructions to ensure that the critical aerodynamic characteristics are preserved. This focus on preserving the design and function of the pitot-static system underscores the importance of proper maintenance techniques that do not interfere with the system’s operational parameters.