A proposal is not in force. If adopted, it becomes an AD, usually with changes. Only the Federal Register edition is official.
Summary
We propose to adopt a new airworthiness directive (AD) for the products listed above. This proposed AD would require revising the maintenance program to update inspection requirements to detect fatigue cracking of principal structural elements (PSEs). This proposed AD was prompted by a new revision to the airworthiness limitations of the maintenance planning document. We are proposing this AD to ensure that fatigue cracking of various PSEs is detected and corrected; such fatigue cracking could adversely affect the structural integrity of these airplanes.