Maintenance, repair, and overhaul, or shortened MRO is a phrase broadly used to describe aircraft maintenance activity. The MRO has today become an indispensable part of the airline industry.
It is a fundamental requirement to secure that aircraft are maintained in pre-determined conditions of airworthiness to securely carry passengers and cargo. When thinking about aviation maintenance and repair companies, MRO is probably the first thing that comes on mind.
Depending on the scope of the permission, they may do a line or basic maintenance and may be narrowed to a set of duties they are authorized to execute.
Base maintenance companies are usually very large companies, which own a hangar required for base maintenance and engaging a large group of people for performing base maintenance responsibilities. They carry out heavy and structural checks, that can last from a few weeks to several months and can cost several million dollars.
Line maintenance companies usually provide minor repairs between two flights. They are rather pretty small and mobile companies maintaining replaceable units of an airplane. The repairs they perform are on daily basis, and therefore it is necessary they are always close to the airport. Line maintenance must be in constant alert in the case of a breakdown on one of the planes.
As you can see airlines and aircraft companies now more than ever need highly-skilled, reliable and certified mechanics in order to maintain their fleets high criteria and assure any overhauls and maintenance is given out to the supreme level.