Part 21 defines what a Design Organisation must demonstrate. It does not define how.
That flexibility is intentional and it has been pushed even further since the inception of the "new" Part 21 Light. EASA recognises that a ten person Ultralight manufacturer and an OEM with 200 engineers need different internal processes. Your Manual describes your specific approach, and the Authority accepts or questions it during oversight.
What this means in practice is that two DOAs can both be fully compliant with Part 21 while operating very differently internally. Compliance is a demonstrated outcome, not a prescribed method.
The implication for DOA managers is important: the question is not only "are we meeting the regulatory requirements?" but "can we demonstrate it clearly, quickly, and consistently — across products and projects, across audits, across staff changes?"
A DOA that can answer yes to the second question is a fundamentally more resilient organisation than one that can only answer yes to the first.
This is what separates the DOAs that find audits routine from those that find them stressful — not the quality of their engineering, but the quality of their compliance infrastructure.
If your Authority called an unannounced oversight visit tomorrow — how long would it take your team to demonstrate compliance with a specific requirement from your last approval? Minutes, hours, or a conversation with the right engineer first?
Hashtags: #Part21 #EASA #DesignOrganisation #Airworthiness