re-issue or re-validation of that aircraft's standard airworthiness certificate. In contrast to a standard airworthiness certificate, an aircraft may be issued with a special airworthiness certificate. Examples of aircraft which are not eligible for standard airworthiness certificates but may be eligible for special airworthiness certificates include agricultural aircraft, experimental aircraft, and some ex-military aircraft. Special airworthiness certificate A special airworthiness certificate is an airworthiness certificate that is not sufficient to allow an aircraft to be used in commercial passenger or cargo operations. In the United States a Special Airworthiness Certificate is issued in one or more of the following categories: See also Type certificate Joint Aviation Requirements Notes References The Code of Federal Regulations Title 14, Volume 1, Part 21 External links UK Civil Aviation Authority Sri Lanka Aviation licenses and certifications Aircraft maintenance