This is a simplified design organisation approval. It can be used a derogation to the requirement to hold a Part 21 Subpart J DOA for certain simpler certification projects and is the default design organisation approval necessary for applicants for UK Technical Standard Order Authorisations (UKTSOA), with the exception of UKSTOA for APU.
The ADOA does not include any privileges, except when issued to support UKTSOA, the ADOA Holder may classify and approve certain minor changes to its approved equipment.
The process for the application for DOA and ADOA is detailed below.