EASA REGULATION (European countries)
Airworthiness and certification can be done in different ways, depending on the “type” of sailplane:
EASA used sailplane,
EASA new sailplane,
Annex I type sailplane (non EASA type of sailplane).
Certified EASA sailplanes require valid Certificate of Airworthiness (CofA).
If the sailplane is modified, CofA is not valid anymore.The following options are possible to make the saiplane airworthy again:
Initially EASA Permit to fly (PtF) can be arranged based on EASA Approval of flight conditions. One of the conditions EASA requires to issue an Approval of flight conditions is that the application for certification project is applied to EASA by DOA or ADOA organization.
LZ design does not yet hold a DOA or ADOA certificate, so we cooperate with other companies, and sailplane manufacturers which are usually certified as ADOA.