21. It was not a success, failing to obtain its certificate of airworthiness because of insoluble spinning characteristics. 22. A certificate of airworthiness is issued when the aircraft is registered in the name of the owner. 23. Once the changes are completed on each individual aircraft the regulatory authorities can return its certificate of airworthiness . 24. In Canada the Europa is an amateur-built aircraft and qualifies for a " Special Certificate of Airworthiness ". 25. Its certificate of airworthiness was last renewed on 4 November 1987 and was valid until 30 November 1988. 26. The aircraft's Certificate of Airworthiness had last been renewed in November 1928 and was valid for a year. 27. The Pouss Pou first flew in August 1980 and obtained its Certificate of Airworthiness on 21 July 1981. 28. Once the changes are completed on each individual aircraft the regulatory authorities can return its Certificate of Airworthiness . 29. The first certificate of airworthiness for an electric powered aircraft was granted to the Lange Antares 20E in 2003. 30. It flew again in 1947 and was delivered to British Air Transport at Redhill, gaining a Certificate of Airworthiness .
