G.R. Patterson III wrote:

In a Cessna if you try to use a zero flap airspeed with flaps 20 you
will wonder why you have to hold it on the ground to keep it from
flying. Having the flaps stuck at 20 is no emergency.


Neither is having a door pop open but, look how many pilots that has killed.
Anything you are not prepared to deal with is a hazard.

Not checking retraction of flaps at 20 degrees is pretty far down the list
of dangers. However, not being in the habit of checking bumps it way up
when you use 30 or 40 in a tight spot.

--

Roger Long