What is the type of training required by flight crew members who have not served in a similar capacity on another airplane in the same group?

Initial training is the correct answer for the type of training required by flight crew members who have not served in a similar capacity on another airplane in the same group. This training is specifically designed for crew members who are stepping into a new role or airplane type for the first time. It encompasses a comprehensive overview of both aircraft systems and operating procedures, ensuring that crew members are thoroughly equipped with the necessary knowledge and skills to operate the aircraft safely.

Initial training typically includes both classroom instruction and practical hands-on experience, which is critical for new crew members to familiarize themselves with the specifics of the aircraft they will be operating. This includes understanding aircraft systems, performance characteristics, emergency procedures, and regulatory requirements.

In contrast, upgrade training is focused on crew members who are advancing to a higher role or authority within the same aircraft type or group. Transition training pertains to crew members who are moving from one aircraft type to another within the same category, while advanced training generally refers to specialized training for experienced crew members aiming to enhance their skills further. Each of these options serves different purposes, and initial training stands out as the necessary step for those entering a new aircraft category for the first time.