[harrison987]

I am confused by the reason for the 2 production plates on the fuselage side.

It was already proven that the second plate did not indicate an older airframe updraged to G-10, as all G-10's were made new.

JaPo's G-10/U4 book explains it indicated "changes" at time of production, but the book does not explain the types of changes.

Were these "changes" possibly repairs done to damaged machines which had not yet left the hands of the manufacture - such as a replacement part after a failed test-flight or damaged while in transport?

The G-10 did have some upgrades as the months went on, but I do not think enough to warrant a second plate.

Can anyone clarify this?