Surely the pitch of the propellor is a function of the Sensenich Part number and the same part number applies to all serial numbers of the Archer 11 according to the TCDS. Where does the suggestion of a 62" pitch on later aircraft come from?
Ah - found the reference here:
http://www.sensenich.com/files/docum...1349891787.pdf
The determination of what's currently allowed will be the IPC. I did a trawl of the UK CAA AAN database and couldn't see any existing approval for the suggested change.