Marshall of Cambridge Aerospace have revoked the type certificate for all Slingsby Firefly T67 variants. on 13th May 2019 EASA issued a Specific Airworthiness Specification EASA.SAS.A.390 for the purposes of the issue of a Restricted Certificate of Airworthiness. All T67 aircraft must be transferred to the restricted certificate before 13th May 2020. See link below. https://www.easa.europa.eu/document-library/specific-airworthiness-specifications/easasasa390