54 STAT.] MULTILATERAL-TELECOMMUNICATION-APR. 8, 1938 [292] [293] [294] [295] [296] [297] [298] [299] [300] §3. (1) In the aeronautical service, after communication has been established by means of the complete call signal [see §2 (d) and (e)] [Nos. 296 and 297], the aircraft station may use an abbreviated call signal composed: [301] (a) in radiotelegraphy, of the first and last letters of the complete 5-letter call signal; [302] (b) in radiotelephony, of all or part of the name of the owner of the aircraft (company or individual) followed by the last two letters of the registration mark. [303] (2) The provisions of this paragraph may be completed or changed by regional agreements between the countries concerned. [304] The use of these abbreviated signals shall be valid only in the interior of the aeronautical service. [305] §4. (1) The 26 letters of the alphabet, as well as the figures in the cases provided for in §2, may be used to form call signals; accented letters shall be excluded. [306] (2) However, the following letter combinations may not be used for call signals: [307] (a) combinations beginning with A or B, these two letters [308] [309] [310] (b) (c) (d) being reserved for the geographical part of the Inter- national Code of Signals; combinations used in the International Code of Signals, second part; combinations which might be confused with distress signals or with other signals of a similar character; combinations reserved for the abbreviations to be used in the radio services (appendix 11). Oombinstime ad tobe d. Post, p. 1621. [3161 1 The combinations indicated in (b) [No. 308] may be used by aircraft after the Permanent Committee of the International Code of Signals has agreed on this question, and after it has taken, so far as this code is concerned, the measures necessary to avoid any confusion. This agreement will be notified by the Bern Bureau. §2. (a) (b) (c) (d) (e) 00 (V) (g) Call signals shall consist of: three letters, in the case of land stations; three letters, or three letters followed by a single figure (other than 0 or 1), in the case of fixed stations; four letters, in the case of ship stations; five letters, in the case of aircraft stations; five letters preceded and followed by the Morse code signal corresponding to "underlined" (. . - - . _),in the case of stations on aircraft carrying matter having to do with the functioning of the League of Nations; in radiotelephony, the call signal of these aircraft shall be preceded by the words "Societe des Nations"; four letters followed by a single figure (other than 0 or 1), in the case of other mobile stations; one or two letters and a single figure (other than 0 or 1) followed by a group of not more than three letters, in the case of amateur stations, private experimental stations, and private radio stations; however, the pro- hibition against the use of the figures 0 and 1 shall not apply to amateur stations. 1497
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