large commercial systems require the same kind of maintenance philosophy as military systems. See also ARP4761 Block diagram Reliability engineering System safety External links OPNAV Instruction 4790.13A, Maintenance of Surface Ship Electronic Equipment, Department of the Navy OPNAV Instruction 4790.4E, Ships' Maintenance and Material Management (3-M) System Policy, Department of the Navy (periodic maintenance) OPNAV Instruction 4790.16A, Condition-Based Maintenance Policy, Department of the Navy OPNAV Instruction 4700.7L, Maintenance Policy For United States Navy Ships, Department of the Navy OPNAV Instruction 3000.12A, Operational Availability Of Equipments And Weapons Systems, Department of the Navy OPNAV Instruction 3500.39C, Operational Risk Management, Department of the Navy OPNAV Instruction 3501.316B, Policy For Baseline Composition And Basic Mission Capabilities Of Major Afloat Navy And Naval Groups, Department of the Navy OPNAV Instruction 3501.383, Fleet Readiness Reporting Guidance, Department of the Navy OPNAV Instruction 8000.16C, Naval Ordnance Maintenance Management Program, Department of the Navy OPNAV Instruction 9070.1, Survivability Policy For Surface Ships Of The U.S. Navy, Department of the Navy References Quality assurance