"Saryon" wrote in message ...
FWIW, my 172S POH specifically states "Flight into known icing
prohibited" in the limitations section. Is doing something
specifically mentioned as prohibited in the POH actionable?

Absolutely.
91.9 Civil aircraft flight manual, marking, and placard requirements.
(a) Except as provided in paragraph (d) of this section, no person may operate a civil aircraft without complying
with the operating limitations specified in the approved Airplane or Rotorcraft Flight Manual, markings, and
placards, or as otherwise prescribed by the certificating authority of the country of registry.