Notice of Proposed Amendment, what will this mean in plain English?
It means that should there be no adverse comment from any interested parties before the closing date for review, then the proposed changes will be introduced within a future amendment of JAR OPS (or whatever the NPA refers to). If there is comment and feedback, it is reviewed and possibly changes made, before implementation.
Until the NPA is implemented, you operate to the existing vesrion of OPS-3
If you are not required to operate PC1, you can operate PC2, simple!