Originally Posted by
de727ups
I looked up the TCDS for the 172N. I had a seaplane, so that's where I got the 30 degrees of flaps, from. The landplane did have 40 degrees. The P models and newer had 30 degrees.
There's also some places that put a strip of metal preventing flap extension past 30 degree's also. Not a bad idea really. Most training/rental pilots really don't need to be using it IMO. If you need that level of flap extention, you probably need to consider another approach or alternate.