# Commission Regulation (EU) No 748/2012 of 3 August 2012 laying down implementing rules for the airworthiness and environmental certification of aircraft and related products, parts and appliances, as well as for the certification of design and production organisations (recast) (Text with EEA relevance), Division (a): A type-certificate and restricted type-certificate shall be issued for an unlimited duration. They shall remain valid subject to:

Extent: E+W+S+N.I.

1..the holder remaining in compliance with this Annex 1 (Part 21); and
2..the certificate not being surrendered or revoked under the applicable administrative procedures established by the CAA.

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Source: https://www.legislation.gov.uk/eur/2012/748/annex/I/section/A/division/subpart+b/division/21.a.51/division/a (the official version)
Page: https://openlegislation.uk/eu-regulation-2012-748/annex-I/section-A/division-subpart+b/division-21.a.51/division-a
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.