Because Part-IS is now in force, non-compliance is treated as a regulatory matter. During an audit, a national aviation authority can raise findings and require a corrective action plan. Continued failure to address those findings can lead to increased oversight, financial penalties depending on the jurisdiction, and in serious cases restrictions or suspension of your approvals, which can affect your ability to operate.
There is also the reputational side. If a security incident happens alongside weak governance, the damage to trust can outlast any fine. The practical takeaway is to keep your ISMS active and auditable rather than treating it as a one off project. Tools such as AeroScan can help by scanning your IT infrastructure and producing a clear list of action items, which makes ongoing compliance much easier to demonstrate.
