As another poster said, it could have been due to a windshield crack. (BTW,
on a 727 there is no restriction if an outer pane only is cracked. A
pressurization limitation of 5PSID and 2 PSID would be imposed in the event
of inner or both panes cracked, respectively).

Another reason for a speed limitation (on the B727) include inop Yaw Dampers
(270K to 350K depending on altitude)
"Thomas J. Hammond" wrote in message
...
A Canadair RJ-200 pilot reported a 250 KIAS speed restriction due to
structural reasons.

Can anyone provide more detailed info on the RJ-200 problem???