Not sure if one is required. I believe a float kit may have been
offered for the 120/140 as a factory option, so it may be covered in the
original type certificates. If you are not a member of the
International Cessna 120/140 Association, I would suggest joining them.
They have somewhere around 1500 members and many very knowledgeable in
these matters. Try http://www.cessna120-140.org/

Scott
1947 Cessna 140


Chris wrote:
Does anyone know if an stc exists for float attachments for a 1946
Cessna 140?