C-1. Jumpmasters must conduct a jumpmaster duty within 180 days of their last JM duty to remain current. JM duties from rotary-wing aircraft that require the jumper to exit from a seated position (UH-60 Blackhawk) do not count toward a JMs currency. JMs that lose currency must complete jumpmaster refresher training prior to conducting their next JM duty.C-2. Nonstandard aircraft such as the CASA 212 and rotary-wing aircraft such as the CH-47, will count towards a JMs currency as long as the previous JM duty was executed from a high-performance aircraft. If the previous duty performed for currency was from a nonstandard or rotary-wing aircraft, the following duty performed for currency must be from a high performance aircraft. (See table C-1.)