30. Amendments

Amendments to these Rules shall be approved by each of:

  1. the World Council,
  2. the Advisory Council,
  3. at least two thirds of the membership replying in writing to the International Office of the Class in response to a postal ballot published by the International Office of the Class. Only those postal votes returned to the International Office within 6 months from the date of publication of the rule change shall be valid, and
  4. the ISAF.