wrote in news:
http://makeashorterlink.com/?S3CF25F9C

However the current FAR Part 23 gust requirements have changed
from those (30 fps) shown on the posted Flight Envelope. The current
requirements are as below.

Section 23.333: Flight envelope.
(c) Gust envelope.

(1) The airplane is assumed to be subjected to symmetrical vertical gusts
in level flight. The resulting limit load factors must correspond to the
conditions determined as follows:

(i) Positive (up) and negative (down) gusts of 50 f.p.s. at VC must be
considered at altitudes between sea level and 20,000 feet. The gust
velocity may be reduced linearly from 50 f.p.s. at 20,000 feet to 25 f.p.s.
at 50,000 feet.

Bob Moore