EAA Comments On NavWorx Airworthiness Directive
FAA Airworthiness directives (AD) are issued when the FAA finds a condition that renders a type-certificated airplane un-airworthy. Sometimes ADs require immediate action, and at other times they may take place over a prescribed time span or require periodic inspections. However, the position has been taken for some time that they commonly do not apply to aircraft certified as experimental.