305.333.  Tax levy — rate — procedure to adopt — election, when — ballot form — use of revenue. — 1.  The board of directors of any county airport authority may levy, if a majority of the voters voting thereon approve, in addition to all other taxes heretofore approved, a tax of not more than twenty-five cents per one hundred dollars of assessed valuation to be used for the support of the authority.

  2.  The proposition to levy the tax authorized by subsection 1 of this section may be submitted by the board of directors at the next regular municipal or school election conducted by the county clerk in such county or at a special election called for the purpose, or upon petition of two hundred registered voters of the county.  A separate ballot containing the question shall read as follows:

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If a majority of the qualified voters casting votes thereon be in favor of the question, the board of directors shall accordingly levy a tax in accordance with the provisions of this section, but if a majority of the voters casting votes thereon do not vote in favor of the levy authorized by this section, no tax shall be levied.

  3.  Funds derived from the tax which may be levied pursuant to this section may be used to pay the principal and interest of any revenue bonds which may have been issued by the authority, or for any other purpose within the powers of the authority.