Sec. 23.929 - Engine installation ice protection.
Propellers (except wooden propellers)
and other components of complete engine installations must be protected
against the accumulation of ice as necessary to enable satisfactory
functioning without appreciable loss of thrust when operated in the icing
conditions for which certification is requested.
[Amdt. 23-14, 33 FR 31822, Nov. 19, 1973, as
amended by Amdt. 23-51, 61 FR 5136, Feb. 9, 1996]