Definition
The collective term for all work performed to keep an aircraft and its components airworthy. Maintenance covers routine inspections and servicing to prevent failures; repair restores a damaged or worn item to a serviceable condition; and overhaul is the complete disassembly, inspection, reconditioning, and reassembly of a component to return it to a specified standard, often as if new.
Plain English
The full range of work that keeps aircraft safe to fly: regular check-ups, fixes when something breaks or wears out, and full rebuilds of major parts like engines.
Context Anchor
You may see this term in maintenance records, aircraft ownership discussions, repair station information, and aviation business or safety reports.
Derivation
Maintenance comes from words meaning to hold or keep something in a certain condition. Repair comes from a word meaning to restore or make ready again. Overhaul means a more thorough taking-apart, checking, and rebuilding. Together, the phrase separates routine upkeep, fixing faults, and deeper restoration work.
Why Pilots Care
Proper Maintenance, Repair, And Overhaul ensures the aircraft meets legal airworthiness standards and operates safely, directly protecting the pilot, passengers, and anyone on the ground.
Intuition Check
Do not read this as just three ordinary jobs listed together. In aviation, Maintenance, Repair, And Overhaul names the whole system of approved work that keeps aircraft safe, usable, and legal to fly.
Example Sentence 1
The flight school sends its engines to an approved MRO facility for overhaul every 2,000 hours.
Example Sentence 2
After the engine reached its recommended time in service, it was sent for a complete Maintenance, Repair, And Overhaul at a certified facility.