A substantial sector of the company is devoted to the repair and overhaul of a wide range of aircraft and engine equipment for the Italian Defence Administration and other customers. In addition to the company's products and to equipment of similar nature produced by foreign suppliers, this activity also covers fuel, hydraulic and lube oil engine pumps, propeller controls, flight controls, anti-skid systems, aircraft in-flight refuelling systems, environmental control equipment, anti-g valves, etc.

Prompt quality service has earned the company a reputation of excellence within the aerospace community. The entire repair and overhaul process is documented from the receiving report, listing defects and customer requirements, to the final release certificate. Secondo Mona maintains an up-to-date library of original manufacturers component maintenance manuals, bulletins and engineering drawings through specific service agreements with the original manufacturers.