A USB device for secure data loading to a system component, such as of an aircraft. The USB device is operable in a mass storage mode and in a non-mass storage mode. The USB device initially operates in the non-mass storage mode upon startup and comprises a storage for storing data to be loaded to the system component, a processor and a memory, wherein the memory contains instructions executable by the processor such that the USB device is operable to perform a security check on the data to be loaded to the system component, and switch, upon the security check, from the non-mass storage mode to the mass storage mode to provide the data for loading to the system component.