TM 9-2320 -209 -10-2/T0 36A12-1B-1091-2 Table 4-1. Operator/Crew Preventive Maintenance Checks and Services for Special Purpose Kits NOTE : These checks are to be made in the order listed, within designated interval. B-Before operation A-After operation M-Monthly D-During operation W-Weekly 4-2 Change 1