What is the specification for approved fuels in terms of usage tolerance?

The approved fuel specification regarding usage tolerance is set to 0.15%. This tolerance indicates the acceptable deviation in fuel composition that can still be safely used within the aircraft's systems without adversely affecting performance or safety. Ensuring that the fuel meets this specification is crucial for maintaining engine efficiency, airframe integrity, and overall operational safety.

Fuel that falls outside of this tolerance level could lead to performance degradation, potential engine reliability issues, or even unsafe flying conditions. Therefore, adherence to the 0.15% specification is essential for any operating procedures involving fuel management, ensuring the aircraft operates within its designed parameters and continues to perform reliably.