61 STAT.] SIAM--AIR SERVICE FACILITIES-MAY 8, 1947 devoted to the aeronautical communication service will be devoted exclusively to that service and will not be diverted to the general com- munication service. V. To provide English speaking operators at air-to-ground and con- trol tower communication positions until regulations covering such voice transmissions are promulgated by the Provisional International Civil Aviation Organisation and further, until such regulations are promulgated, to grant permission to a representative of the United States air carriers authorised to serve an aerodrome to enter its con- trol tower and, when in the opinion of the representative a case of necessity exists, to talk to the pilot of any United States aircraft flying in the vicinity of the aerodrome. VI. To select radio frequencies for air-to-ground and control tower operations at an aerodrome only after coordination with the United States air carriers using the aerodrome and with adjacent stations in the recognised international air routes converging on the aerodrome in order to minimise - (a) radio interference; and (b) the number of frequencies required to be operated by aircraft. VII. To authorise and facilitate day-to-day adjustment in aeronau- tical communication service matters by direct communication between the operating agency of the Government of Siam and the service agency of the Government of the United States, United States air carriers or a communication company representing one or more of them. VIII. To authorise United States air carriers of the Civil Aeronau- tics Administration of the United States to designate a technical officer to advise and assist the agency designated by the Government of Siam to operate the facilities insofar as they relate to the safety and efficiency of the United States airline operations. This designa- tion is to continue as long as it is useful to United States air carriers. IX. (a) To furnish in sufficient number suitable personnel to be trained to operate and maintain all facilities transferred under this sale. (b) To negotiate a supplemental agreement to be entered into by the agency of the Siamese Government which will eventually take over the operation of the facilities and the agency of the United States Government, or its representative, which undertakes the train- ing and interim operation and maintenance of the facilities free of any charges or emolument, pending transfer of full operating re- sponsibility to the agency of the Siamese Government. The supple- mental agreement will define the responsibility, authority, and rela- tions between the above mentioned agencies and their representatives during the period the United States agency remains in charge of the operation, maintenance, and training. 3857 Technical officer.
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