Differentiate 'maintenance, repair, and overhaul' (MRO) in sustainment.

• A. Maintenance prevents failure, repair fixes after failure, and overhaul restores assets to like-new condition to extend life.
• B. MRO only covers manufacturing processes.
• C. MRO stands for Major Resource Overhaul unrelated to maintenance.
• D. Maintenance and repair refer to the same activity, with no distinction.

Answer: (A)

Understanding MRO in sustainment means seeing how each activity serves a different purpose in keeping equipment ready. Maintenance is the proactive work that prevents problems before they occur—regular inspections, lubrication, part replacements, and condition monitoring aimed at reliability and uptime. Repair is the corrective work done after a fault or failure is detected, aiming to restore function as quickly as possible and return the asset to service. Overhaul is the more extensive refurbishment that brings an asset back toward like-new condition, often involving disassembly, thorough inspection, major component replacement, and reassembly to reclaim full performance and extend the asset’s life. In sustainment, these activities together—preventing issues, fixing what fails, and refreshing assets—keep systems available and capable over time. The description that maintenance prevents failure, repair fixes after failure, and overhaul restores assets to like-new condition to extend life captures this progression and purpose. The other statements miss essential aspects: manufacturing processes aren’t what MRO encompasses, MRO isn’t a separate Major Resource Overhaul concept unrelated to maintenance, and maintenance and repair are distinct activities, not the same.