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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.
When the standard ATS messages are
prepared in teletypewriter form, an Alignment
Function (two Carriage Returns followed by one
Line Feed) shall be inserted:
(a) prior to each of the fields so annotated in the
reference table on this page;
(b) in Fields Type 5 (Description of emergency),
15 (Route), 18 (Other information), 19
(Supplementary information), 20 (Alerting
search and rescue information), 21 (Radio
failure information) and 22 (Amendment),
whenever it is necessary to begin a new line
on page copy (see Note). In such cases, the
Alignment Function shall be inserted between
two data elements and shall not divide an
element.
Note.— Annex 10 prescribes that a line
of teletypewriter copy shall not contain more
than 69 characters.
Data conventions
Most of the conventions to be used in the
expression of ATS data in the messages are
prescribed in the field tables on pages A3-5 to
A3-29, but the conventions for the expression of
level, position and route data are given below.
The expression of level data
Four alternative conventions are available for
the expression of level data:
(a) “F” followed by 3 decimal numerics:
indicates a Flight Level Number, i.e. Flight
Level 340 is expressed as “F340”;
(b) “S” followed by 4 decimal numerics:
indicates a Standard Metric Level in tens of
metres, i.e. Standard Metric Level 11 300 m
(Flight Level 370) is expressed as “S1130”;
(c) “A” followed by 3 decimal numerics:
indicates altitude in hundreds of feet, i.e.
an altitude of 4 500 feet is expressed as
“A045”;
(d) “M” followed by 4 decimal numerics:
indicates altitude in tens of metres, i.e. an
altitude of 8 100 metres is expressed as
“M0810”.
The expression of position or route
The following alternative data conventions
shall be used for the expression of position or
route:
(a) from 2 to 7 characters, being the coded
designator assigned to an ATS route to be
flown;
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