Sec. 506. **[**46 App. U.S.C. 1156**]**
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## Sec. 506 **[**46 App. U.S.C. 1156**]** Every owner of a vessel for which a construction-differential subsidy has been paid shall agree that the vessel shall be operated exclusively in foreign trade, or on a round-the-world voyage, or on a round voyage from the west coast of the United States to a European port or ports which includes intercoastal ports of the United States, or a round voyage from the Atlantic coast of the United States to the Orient which includes intercoastal ports of the United States, or on a voyage in foreign trade on which the vessel may stop at the state of Hawaii, or an island possession or island territory of the United States, and that if the vessel is operated in the domestic trade on any of the above-enumerated services, he will pay annually to the Secretary of Transportation that proportion of one twenty-fifth of the construction-differential subsidy paid for such vessel as the gross revenue derived from the domestic trade bears to the gross revenue derived from the entire voyages completed during the preceding year.
The Secretary may consent in writing to the temporary transfer of such vessel to service other than the service covered by such agreement for periods not exceeding six months in any year, whenever the Secretary may determine that such transfer is necessary or appropriate to carry out the purposes of this Act. Such consent shall be conditioned upon the agreement by the owner to pay to the Secretary upon such terms and conditions as it may prescribe, an amount which bears the same proportion to the construction-differential subsidy paid by the Secretary as such temporary period bears to the entire economic life of the vessel.
No operating-differential subsidy shall be paid for the operation of such vessel for such temporary period.