Which KPI is commonly used in ARM?

• A. Flight hours per aircraft
• B. Mission Capable (MC) rate
• C. On-time departure rate
• D. Maintenance backlog days

Answer: (B)

In ARM, fleet readiness is tracked with a metric that directly shows how often aircraft are able to perform the required mission. The Mission Capable rate reflects the proportion of aircraft that are ready to fly when needed, tying together maintenance status, availability, and reliability into a single, actionable measure. This makes it the most useful KPI for guiding maintenance priorities, scheduling, and resource allocation, because it directly answers: are we actually able to execute the mission with the aircraft we have?

Flight hours per aircraft gauges utilization and workload, not whether the aircraft are ready to fly. On-time departure rate focuses on operational punctuality, which can be influenced by many non-maintenance factors. Maintenance backlog days indicate outstanding work but don’t by themselves show how much of the fleet is currently capable for missions.