5.3.1 The Administration should prescribe, if
appropriate, limits of safe use of any of the directional control
devices, if necessary, following a demonstration, and be satisfied
by such demonstration that all systems as fitted and limited are effective
within the permitted speed ranges in all conditions for which the
craft is to be certificated.
5.3.2 The Administration should determine by demonstration
any adverse effects upon safe operation of the craft in the event
of an uncontrollable total deflection of any one steering device,
and should prescribe any limitation on the operation of the craft
as may be necessary to ensure that the redundancy or safeguards in
the systems provide equivalent safety.