Definition
Maintenance, Repair, and Overhaul refers to both the activities and the organisations involved in keeping aircraft airworthy throughout their operational life. MRO organisations are certified by aviation authorities — holding an FAA Part 145 Repair Station Certificate, EASA Part-145 Approval, or equivalent national authorisation — to perform maintenance tasks ranging from routine inspections and component replacements to major structural repairs and complete engine overhauls. The MRO industry is segmented into several categories: airframe heavy maintenance (structural inspections and modifications), engine MRO (overhaul and repair of turbine and piston engines), component MRO (repair and testing of individual parts like avionics, landing gear, and instruments), and line maintenance (routine checks and minor repairs performed between flights). Flight schools primarily interact with line maintenance and component-level MRO services, though engine overhauls represent a major periodic expense. For flight schools with in-house maintenance capabilities, the school's maintenance department effectively functions as an MRO for its own fleet. Schools without in-house maintenance contract with external MRO providers for everything from 100-hour inspections to engine overhauls and propeller servicing. The choice between in-house and outsourced maintenance significantly affects cost structure, turnaround times, and fleet availability.
Why It Matters for Flight Schools
Flight schools are heavy consumers of MRO services because their aircraft accumulate hours rapidly. A busy training aircraft may fly 800 to 1,200 hours per year, requiring frequent 100-hour inspections, annual inspections, and component replacements. Engine overhauls — typically required every 1,800 to 2,000 hours for common training aircraft engines — represent one of the largest single maintenance expenses a flight school faces. The relationship with MRO providers directly impacts fleet availability. A maintenance provider with fast turnaround times and reliable parts sourcing keeps aircraft in the air and generating revenue. Conversely, an MRO that consistently delivers late or experiences parts delays can create scheduling chaos and revenue loss for the flight school.
How Aviatize Handles This
Aviatize integrates MRO coordination into its maintenance control and maintenance execution modules. The platform tracks maintenance work orders sent to external MRO providers, monitors estimated completion dates, and updates aircraft availability status in the scheduling system as work progresses. For schools with in-house maintenance teams, Aviatize provides work order management, parts inventory tracking, and labour hour logging that streamline the internal MRO workflow. The platform forecasts upcoming major maintenance events — such as engine overhauls based on accumulated Hobbs time — giving school owners advance notice to budget for these significant expenses and plan fleet rotations to minimize operational impact.