One of the many features of the FSAirlines system is the ability to maintain your planes, making them more or less vulnerable to failures and damage. With each flight the status of an aircraft gets lower so it's a good advise to repair your aicraft on a regular basis to prevent bad failures during flight.
On FSAirlines your aircraft is repaired during the regular checks you can initiate buy clicking on the maintenance-button on the fleets page. Depending on the aircraft status a different check must be done but your aircraft will always be returned at 100%.
|A-Check||95% - 100%||1 day||3% of value as new|
|B-Check||75% - 95%||3 days||20% of value as new|
|C-Check||40% - 75%||7 days||50% of value as new|
|D-Check||0% - 40%||14 days||80% of value as new|