Section 246. Penalties for violation of the foregoing provisions

A person
  who violates any of the foregoing provisions of this  article  shall  be
  guilty  of  a  misdemeanor and punishable by a fine of not more than one
  hundred dollars, or by imprisonment for not more than  ninety  days,  or
  both.  Failure  by  an  operator  to  exhibit his pilot certificate upon
  proper demand or failure to show the aircraft  registration  certificate
  upon  proper  demand  shall be presumptive evidence that the operator is
  not duly licensed or that the aircraft is not duly registered under this
  article. That an act or omission with respect  to  rules  set  forth  in
  subdivision  six  of  section two hundred forty-five was done or made in
  accordance  with  regulations  affecting  aircraft  subject  to  federal
  aviation  regulations, or that a landing or take-off from or on a public
  street or highway  was  done  with  consent  of  local  authorities  and
  approval of the administrator of the federal aviation agency, or that an
  act  or  omission  which  would otherwise be a violation of a prescribed
  rule was an authorized deviation under subdivision eleven of section two
  hundred forty-five, shall be matters of defense.