Comparison of Army Aviation maintenance methods via discrete event simulation

Army Aviation utilizes two distinct types of overhaul maintenance schedules on its rotary wing aircraft, Phase Maintenance and Progressive Phase Maintenance. All but one aircraft, the OH-58D Kiowa Warrior, use Phase Maintenance. This aircraft has both the highest operational readiness rate and average flight hours in the Army´s rotary wing fleet. The Army values uniformity in maintenance procedures across its fleets; however this inconsistency has existed for two decades. This study models the value and tradeoffs of one method versus the other using discrete event simulation. Progressive Phase Maintenance offers more efficiency in terms of time available for missions and may be applicable other airframes. Using the airframe specific Aeronautical Equipment Maintenance Management Policies and Procedures Training Manual and a operational data set from a deployed aviation unit, this study compares the two overhaul maintenance schedules in terms of operational readiness. The effectiveness of each method is measured in the amount of time each airframe is for missions.