The FAA has issued a new rule replacing previous airworthiness directives for ATR72 airplanes. This rule mandates incorporating updated airworthiness limitations to prevent fatigue cracking that could compromise the airplane's structure. The updated limitations are based on European Union Aviation Safety Agency guidelines and apply to certain ATR72 models, excluding those with certificates issued after December 12, 2019. The new requirements must be implemented by March 31, 2021, with specified compliance details and options for alternative approaches.
Simple Explanation
The FAA has made a new rule to keep certain airplanes safe by updating some important rules they must follow, just like how a car needs regular check-ups to stay safe. These updates will help make sure the planes are strong enough and won't break, and they need to follow these rules by the end of March 2021.