(a) Period of time No alien crewman shall be permitted to land temporarily in the United States except as provided in this section and sections 1182(d)(3), (5) and 1283 of this title. If an immigration officer finds upon examination that an alien crewman is a nonimmigrant under paragraph (15)(D) of section 1101(a) of this title and is otherwise admissible and has agreed to accept such permit, he may, in his discretion, grant the crewman a conditional permit to land temporarily pursuant to regulations

It shall be unlawful for any person, including the owner, agent, consignee, charterer, master, or commanding officer of any vessel or aircraft, to pay off or discharge any alien crewman, except an alien lawfully admitted for permanent residence, employed on board a vessel or aircraft arriving in the United States without first having obtained the consent of the Attorney General. If it shall appear to the satisfaction of the Attorney General that any alien crewman has been paid off or discharged in

A Form I-184 is valid until revoked. It shall be revoked when an immigration officer finds that the crewman is in the United States in willful violation of the terms and conditions of his or her permission to land, or that he or she is inadmissible to the United States. On revocation, the Form I-184 shall be surrendered to an immigration officer. No appeal shall lie from the revocation of Form I-184. 8 C.F.R. §252.4 62 FR 10388, Mar. 6, 1997