What does the acronym SCA stand for in aviation?

The acronym SCA in aviation stands for Student Certificate of Authorization. This document is crucial as it allows a student pilot to begin solo flight operations, signifying that they have met specific training requirements and are deemed capable of flying solo under certain conditions. The SCA is issued by a flight instructor who has evaluated the student’s competency and readiness to fly independently. Thus, obtaining this certificate is an important milestone in a student pilot's journey toward becoming a fully licensed pilot.

Other choices relate to certificates or agreements that do not accurately reflect the necessary authorization for student pilots to conduct solo flights, which is why they do not apply in this context.