"Ramapriya" wrote
As far as I know (which isn't much), limitations on taxi speeds are
specified generally by airlines rather than aircraft manufacturers.
I'm aware of at least 3 Middle East airlines that specify this as part
of their SOPs.

Ramapriya, a typical airline pilot is subject to several sources of
rules and regs, FAA Part 121 and Parts 61/91, the FAA approved AFM from
the manufacturer, the AIM, and finally, the whims of the Chief Pilot.
Normally, pertinate portions of all of these directives are combined
into a single document called the SOP or AOM (Aircraft Operations Manual).

After a while, the average pilot who has only flown under that airline's
system, looses sight of just where any single directive in the SOP/AOM
came from and it really doesn't matter, since his SOP/AOM has the same
effect as the FARs for his operations.

This is of course how it works in the USofA system.

Bob Moore