What is double-checking, and how will it be affected?
An aircraft builder documents his or her compliance with the 51% Rule by checking off the construction tasks that he or she has done. When both the builder and the factory or commercial builder assistance provider check off the same task, it is called “double-checking.” For some complex or quick-build kits, double-checking has been commonly used to credit both parties equally for this work. However, some FAA statements have suggested that it may either prohibit double-checking or assign more accurate contribution proportions, such as 60/40, 80/20, etc.
