When is it appropriate to recommend a trainee for additional skill levels?

Recommending a trainee for additional skill levels is appropriate once they are fully trained on all duty positions. This ensures that the individual has gained comprehensive knowledge and experience in their role, demonstrating that they are competent and capable of handling the various responsibilities associated with those positions.

Being fully trained on all duty positions equips the trainee with the necessary skills to perform effectively, make informed decisions, and respond appropriately in various scenarios. It also indicates that they have achieved a level of proficiency that justifies further advancement in their career development.

In contrast, the other options do not sufficiently capture the essence of readiness for additional skill levels. Merely completing a set period, exhibiting leadership qualities, or finishing a written test does not necessarily mean the individual has the hands-on experience and understanding required to advance. True competency in aviation resource management hinges on practical training and comprehensive readiness across all relevant duties.