Have you ever wondered where the aircraft maintenance is carried out and by who? And how is it carried out?
Each of us has some kind of experience with cars. We all know that when we reach certain mileage intervals, it is necessary to subject the vehicle to a check to continue to keep it efficient and to keep working as the years' pass.
The same goes for airliners and civil aviation aircraft.

First of all, the onboard sensors help to get a global idea of the overall health of the aircraft and many minor interventions are carried out frequently. This happens in particular with the inspections of the wheels of the trolleys, the fluid levels of the hydraulic systems...
Alongside these procedures, we find the scheduled coupons, based on the hours of flight performed, the cycles performed, the old age of an aeroplane.
These controls are defined as Check and are divided into four levels, from A to D.
The closer we get to D, the longer and more thorough these checks are.


Let's see in detail:
• A Check: it takes place approximately every 10 weeks. All filters are replaced and the most important moving parts are lubrificated, such as the control surfaces. Emergency equipment is inspected;
• B Check: it traditionally belonged to older generation aircraft. On the more modern ones, the check is released in the following steps;
• C Check: it is carried out every 18 months and lasts an average of 3 weeks. The aircraft systems are tested. If necessary, they are disassembled, inspected and reassembled;
D Check: it is the most thorough inspection. It is carried out every 6 years. At this stage, the plane is completely disassembled in all its parts. The inspection is carried out and the metal structure is the only part left in view because it will be carefully examined for any stress or other damage.