A standard certificate of airworthiness is a permit for commercial passenger or cargo operation, issued for an aircraft by the civil aviation authority in the state/nation in which the aircraft is registered. For other aircraft such as crop-sprayers, a Special Airworthiness Certificate (not for commercial passenger or cargo operations) must be issued. A certificate of airworthiness (CoA), or an airworthiness certificate, is issued for an aircraft by the civil aviation authority in the state in which the aircraft is registered. The CoA attests that the aircraft is airworthy insofar as the aircraft conforms to its type design. Each certificate is issued in one of a number of different categories when the aircraft is registered in the name of the owner. Thereafter, a yearly currency fee is payable to renew the CoA. If this fee is not paid when due, the certificate expires and the owner must apply again for the certificate. The CoA can only be issued when a maintenance release or certificate of release to service (CRS) from the maintenance facility declares that the maintenance due has been carried out and the aircraft is then certified as being airworthy. In the US, Australia and some other countries a CoA is classified as either a standard airworthiness certificate or a special airworthiness certificate. A standard airworthiness certificate is an airworthiness certificate issued for an aircraft by the civil aviation authority in the state in which the aircraft is registered. A standard airworthiness certificate is one of the certificates that are mandatory if an aircraft is to be used in commercial operations. In the US, Australia and some other countries, a standard airworthiness certificate is issued in one of the following categories: Commuter Normal Utility Acrobatic Manned free balloons Special class of aircraft The airworthiness certificate must be carried on board the aircraft and must be presented to a representative of the aviation authority upon request.