Safety fixes for Diamond aircraft expand after production defects found

The US aviation regulator is tightening maintenance requirements for Diamond-brand small aircraft after discovering that fuel tank connection problems continued appearing in newer production models even after an earlier safety order. Pilots and owners will now need to inspect and replace more affected parts across a wider range of aircraft, closing a gap the original fix missed.

This signals that the original safety directive didn't fully solve the problem — additional defective parts kept being installed during manufacturing after the fix was issued. When regulators have to re-issue and expand a safety order, it often means the root cause (how those parts were being made or installed) wasn't actually addressed, only the symptom (replacing bad parts that already got into planes).