Second Stage Climb Gradient?

"Bill" wrote in message
m...
I was told by a co-worker that a new Part 91-mandatory compliance reg
has come out, requiring all airplanes to meet a min. climb gradient of
2.5% for second stage climb gradient, unless published otherwise.

Sure doesn't sound like anything that would show up in Part 91. There's
basically nothing in Part 91 that requires an airplane to be able to climb
at all.

I assume that you don't really mean this applies for all flights, and that
this is some sort of commercial/IFR departure procedure thing?

Pete