John DeGreen, NASA,

NASA is committed to a strategy for facilities maintenance and operation that supports the safest, most cost-effective blend of reliability-centered maintenance (RCM) techniques, sustainability practices, and safety procedures.

NASA has established a tiered maintenance strategy which provides a framework for Centers to allocate their annual resources to critical assets. The Tiers are broken down into four levels. These requirements fall under the application of RCM, which incorporates practices such as Condition Based Maintenance (CBM), Preventive Maintenance (PM) / Scheduled Maintenance, and Reactive Maintenance (R-M). Facilities are assigned to the appropriate Tier based on the assigned scores assigned by the missions called the mission relevancy score. Centers are required to perform minimum maintenance service levels defined for collateral equipment within the facilities in each Tier. Managing to tiered maintenance requirements ensures NASA’s most mission relevant equipment assets are available and reliable providing limited resources to the right assets and the right time.