Definition
A maintenance task in which an aircraft engine is disassembled, inspected, repaired, reassembled, and tested to restore it to a specified airworthy condition in accordance with the manufacturer's overhaul manual and applicable regulations.
Plain English
Taking an aircraft engine apart, checking and fixing every part, putting it back together, and testing it to confirm it runs safely and correctly.
Context Anchor
You may see this phrase in maintenance training, aircraft logbooks, engine time discussions, and decisions about whether an aircraft is ready for continued operation.
Derivation
From the verb 'overhaul,' originally a nautical term meaning to haul rigging over and inspect it thoroughly. The sense carried into mechanical work: take the whole thing apart, look at every piece, and put it back together correctly.
Why Pilots Care
Engine overhaul status directly affects airworthiness, resale value, and reliability. Pilots and owners track time since overhaul to plan maintenance, comply with regulations, and judge the condition of an engine before flight or purchase.
Intuition Check
Do not read overhaul as simply “improve” or “tune up.” In aircraft maintenance, to overhaul an aircraft engine means a defined, thorough process of taking it apart, checking it, repairing it as needed, reassembling it, and testing it.
Example Sentence 1
After the engine reached its recommended hours, the owner sent it to a certified shop to overhaul the aircraft engine before returning it to service.
Example Sentence 2
Following the decision to overhaul an aircraft engine, the shop performed a full test run before returning the airplane to service.