Aircraft maintenance is the performance of tasks required to ensure the continuing airworthiness of an aircraft or aircraft part, including overhaul, inspection, replacement, defect rectification, and the embodiment of modifications, compliance with airworthiness directives and repair.
We know time is running when your plane is grounded for technical reasons: the problem has to be diagnosed, qualified personnel, tools and spare parts have to be provided. Logistics just has to work hand in hand.