def METHOD_NAME(sandbox):
    _fdm = jsbsim.FGFDMExec(root_dir=os.path.join(sandbox(), ''))
    path = sandbox.path_to_jsbsim_file()
    _fdm.set_aircraft_path(os.path.join(path, 'aircraft'))
    _fdm.set_engine_path(os.path.join(path, 'engine'))
    _fdm.set_systems_path(os.path.join(path, 'systems'))
    return _fdm