Sec. 25.581 - Lightning protection.
(a) The airplane must be protected
against catastrophic effects from lightning.
(b) For metallic components, compliance
with paragraph (a) of this section may be shown by --
(1) Bonding the components properly to
the airframe; or
(2) Designing the components so that a
strike will not endanger the airplane.
(c) For nonmetallic components,
compliance with paragraph (a) of this section may be shown by --
(1) Designing the components to minimize
the effect of a strike; or
(2) Incorporating acceptable means of
diverting the resulting electrical current so as not to endanger the
[Amdt. 25-23, 35 FR 5674, Apr. 8, 1970]