TM 9-2320-209-10-2 Table 1-5. M109A3, Operator/Crew Preventive Maintenance Checks and Services for M109A2, M185A2 and M185A3 Shop Van and Instrument Repair Trucks - Cont 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 1-25