|Quoting BigJimFX (Reply 7):|
Not to mention that a panicky go-around would raise all flaps instead of the checklist recommended "Full throttle, flaps 20, Climb speed, positive rate, flaps 10, positive rate, Vy or Vx Flaps up.
Some will, but have you ever seen an extremely flipped out student? They might freeze at a very critical moment; one where you have a very high rate of descent and not really enough time or altitude to properly arrest it without skipping a few heartbeats and a few very quick prayers.
With 40 degrees of flaps, you have a very high rate of descent. Sometimes people changes their mind when they're so close to the ground that they suddenly want to start climbing, no matter what... and if you just blindly move that lever back to zero, you will lose some extra altitude until the plane stabilizes in its new configuration.
That might not be altitude you may have available to spare. It is also a lot harder to climb out of a balked or aborted landing while 40 degrees of flaps is still selected.
It's hard enough with 30, but more realistic then, as you yourself noted and I can personally attest to.
Cessna also made this change concurrently with an engine upgrade for a little extra horsepower. So, between limiting to 30 degrees of flaps and some extra engine power, you basically have a performance boost.
Along with lessened risk of a student crashing. Most students or certificated pilots will not crash, but there's always situations or days where everything just goes wrong. Cessna, I believe, also wanted to limit their exposure to legal liability.
Cessna actually halted production of their GA
planes for years until the 17 year liability rule was passed into law, for this reason. (Expensive lawsuits.)