What is an acceptable limit for a static system leakage check noted in aviation regulations?

In aviation regulations, the acceptable limit for a static system leakage check is 10 feet. This limit is derived from the requirement that any static pressure system in an aircraft must maintain its pressure integrity within a very tight tolerance during operational conditions.

The static system's primary function is to provide accurate altitude and airspeed readings, which are critical for safe flight operations. Even a small leak can lead to significant inaccuracies in these readings. The 10 feet limit ensures that the system can maintain a reliable reference point for altitude measurement, thereby ensuring pilot and aircraft safety.

Limits like 50, 100, or 200 feet would be too permissive and could allow for discrepancies in static pressure readings that could potentially affect flight safety and performance. Thus, adhering to the 10 feet guideline is essential for maintaining the precision necessary for aircraft instrumentation.