Final answer:
NAMP refresher training is typically needed when personnel haven't performed their duties for over 90 days or when significant changes in equipment, procedures, or regulations occur.
Step-by-step explanation:
When is NAMP refresher training required to be conducted? The Naval Aviation Maintenance Program (NAMP) specifies that refresher training is typically required when personnel have not performed core tasks associated with their aviation maintenance duties for a period of more than 90 days. However, this can vary depending on the specific guidelines of a command or the requirements of a particular military service branch. Refresher training is also mandated when there is a significant change in equipment, procedures, or regulations that could impact maintenance operations. This ensures that maintenance personnel are always up-to-date with the most current practices, thus maintaining the readiness and safety of aviation resources.