What requirement must be met for an instructor when applying for an additional rating?

For an instructor to apply for an additional rating, having experience as pilot in command is a critical requirement. This experience ensures that the instructor possesses the necessary practical knowledge and skills to effectively teach and evaluate students in the additional rating. Pilot-in-command experience provides insight into the responsibilities that come with operating an aircraft, which is fundamental when instructing others on those same responsibilities.

While aspects like simulator training, holding a ground instructor certificate, or completion of a teaching methodology course can enhance an instructor's qualifications and abilities, they are not strict prerequisites for applying for an additional rating. The primary focus is on the actual experience in command of an aircraft, as it directly relates to the instructor's capability to not only cover theoretical aspects but also provide real-world insights and practical knowledge during instruction. This makes pilot-in-command experience essential when expanding an instructor's credentials with additional ratings.