NTSB Issues Recommendation A-12-009 to National Air Racing Group Unlimited Division

The National Transportation Safety Board (NTSB) has issued a safety recommendation, designated as A-12-009 and identified by NTSB number WPR11MA454. This directive is addressed specifically to the National Air Racing Group Unlimited Division. The core requirement mandates that aircraft owners operating within the unlimited class must provide a comprehensive engineering evaluation for any aircraft undergoing major modifications. These evaluations are required to include flight demonstrations and analysis conducted within the anticipated flight envelope of the aircraft. The recommendation explicitly identifies structural changes or modifications to flight controls as examples of major modifications that trigger this requirement, ensuring that safety standards are maintained through rigorous technical assessment before such modified aircraft are flown.