A specific airplane part must now be replaced, not just inspected

US aviation regulators are proposing a new rule that requires airlines to replace a specific part on ATR72 airplanes. This part, a main landing gear hinge pin, has been rupturing, and the new rule means airlines cannot just inspect it, they must replace it.

This change means airlines operating ATR72 planes can no longer rely on inspections to manage the risk of a critical part failure. Instead, they must proactively replace the part, which shifts the cost from potential accident recovery to mandatory maintenance. This is a common pattern in aviation safety: when a part shows a consistent failure mode, regulators move from detection to prevention.