Read the label before the sales listing.
A weight or model name alone does not establish a class mark. Check the aircraft, declaration and manufacturer’s information for the exact variant. A marketplace description saying “compliant” is not a substitute for that evidence.
UK MARK
UK0–UK6
Use the UK class entry in the CAA’s operating and RID guidance.
EU MARK
C0–C6
Read the transitional operating guidance and check the applicable RID conditions.
The 2028 change.
The CAA says European C aircraft can be flown as the corresponding UK class until 31 December 2027. From 1 January 2028, they follow legacy operating treatment unless their status changes through an appropriate manufacturer process.
Why our date finder asks you to check C-marked aircraft
The CAA’s class page describes equivalent operating treatment, while its RID timetable uses UK class labels and describes legacy aircraft differently. Our finder does not resolve that distinction by guessing. Check both sources and your manufacturer’s current UK instructions; ask the CAA if your exact case remains unclear.
A DIY replacement sticker does not establish a new class. Ask the manufacturer about any supported retrospective marking process.
Sources & review.
Official guidance behind this answer
Source review: 26 October 2026. Our practical checklists are editorial aids. Check the current source and your operation’s conditions before making a flying decision.