Thunder Aviation Services of Chesterfield, Mo., received certification of its aviation repair station as an EASA-approved maintenance organization. Based at Spirit of St. Louis Airport, the company is a full-service FBO offering extensive maintenance and avionics programs ranging from major inspections and heavy maintenance to prepurchase evaluations and powerplant HSI and inspections. With more than 100,000 sq ft of hangar space, the company can handle most business aircraft.