[hew]

None on the 337 that I know of but very few have been done, 400 series, a different matter. This is really a butt protecting exercise. If Cessna failed to tell you that there could be a problem then a legal feeding frenzy would ensue if something did fail. You are lucky in the US in that if the aircraft is for private use you don't have to do the SID's. In Australia our CAA says "aircraft shall be maintained according to the manufacturers specifications". If Cessna says the SIDs have to be done then even a humble private 152 has to be done. A big expense for everyone so Cessna doesn't get sued and in our case the CAA is off the hook also.