ONE OR TWO NUMERICS giving the type number of the field to be * Indicates that further
amended.
fields of this type may be added.

OBLIQUE STROKE
(b) Amended Data
The complete and amended data of the field indicated in (a), constructed as specified for that field.
Example of amendment of Field Type 8 (Flight Rules and Type of Flight) to IN: –8/IN Example of amendment of Field Type 14 (Estimate Data):
–14/ENO/0145F290A090A Example of amendment of Fields Type 8 (Flight Rules and Type of Flight) and 14 (Estimate Data):
–8/I-14/ENO/0148F290A110A

RULES FOR THE COMPOSITION OF ATS MESSAGES
(See Sections 1.3 to 1.8 of this Appendix)
Composition of the standard types of message
The composition of each standard type of message, expressed as a standardized sequence of fields of data shall be as prescribed in the reference table on this page. Each message shall contain all the fields prescribed.
Composition of the standard types of field
The composition of each standard type of field, expressed as a standardized sequence of elements of data, or in some cases as a simple element, shall be as prescribed in the field tables on pages A3-5 to A3-29.
Note.— Each type of field contains at least one mandatory element and, except in Field Type 9, this is the first or only element in the field. The rules for the inclusion or omission of optional elements are indicated in the field tables.
Structuring and punctuation
The beginning of the ATS data shall be indicated on page copy by an open bracket `(’, which constitutes the Start-of-ATS-Data Signal. This signal shall be used only as the printed character immediately preceding the Message Type Designator.
Note.— In teletypewriter operation using International Telegraph Alphabet No. 2, the open bracket is transmitted as the Figures Case of Signal No. 11. On some teletypewriter machines, this will print as a symbol other than `(’, but this variation will be local and of no consequence. Where higher level codes are employed, the character printing as `(’ is used.
The beginning of each field, other than the first, shall be indicated by a single hyphen `-’, which constitutes the Start-of-Field Signal. This signal shall be used only as the printed character preceding the first element of ATS data in each field.
Note.— In teletypewriter operation using International Telegraph Alphabet No. 2, single hyphen is transmitted as the Figures Case of Signal No. 1. On some teletypewriter machines, this will print as a symbol other than `-’, but this variation will be local and of no consequence. Where higher level codes are employed, the character printing as `-’ is used.
Elements within a field shall be separated by an oblique stroke `/’ (see Note 1) or a space (sp) (see Note 2) only where so prescribed in the field tables on pages A3-5 to A3-29.
Note 1.— In teletypewriter operation using International Telegraph Alphabet No. 2, the oblique stroke is transmitted as the Figures Case of Signal No. 24. On some teletypewriter machines, this will print as a symbol other than `/’, but this variation will be local and of no consequence. Where higher level codes are employed, the character printing as `/’ is used.
Note 2.— In teletypewriter operation using International Telegraph Alphabet No. 2, the space is transmitted as Signal No. 31. Where higher level codes are employed, the character which causes a space on page copy is to be used.
The end of the ATS data shall be indicated by a close bracket `)’, which constitutes the End-of-ATS-Data Signal. This signal shall be used only as the printed character immediately following the last field in the message.
Note.— In teletypewriter operation using International Telegraph Alphabet No. 2, the close bracket is transmitted as Signal No. 12. On some teletypewriter machines, this will print as a symbol other than `)’, but this variation will be local and of no consequence. Where higher level codes are employed, the character printing as `)’ is to be used.
　
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