Who are the only individuals allowed to train crew members?

The correct choice emphasizes that standardization crew members are specifically designated individuals responsible for training crew members. Their training and authority ensure consistency and adherence to established protocols, procedures, and policies within an aviation context. Standardization crew members typically possess the necessary experience and knowledge to effectively convey the operational standards required for safe and efficient aircraft operations. Their role is crucial since they help maintain the quality and uniformity of training across the crew members, which is vital for flight safety and performance.

While other roles like flight medics, unit trainers, and flight instructors may contribute to various aspects of crew training, standardization crew members are explicitly authorized and trained to focus on the comprehensive training of crew members. This specialization places them at the forefront of ensuring that all crew members are up to standard with the current operational guidelines and best practices in aviation.