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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, Volume II, prescribes that a line
of teletypewriter copy shall not contain more than 69
characters.
1.6 Data conventions
1.6.1 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 to simplify the field tables.
1.6.2 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 330 is
expressed as “F330”;
b) “S” followed by 4 decimal numerics: indicates
Standard Metric Level in tens of metres, i.e. Standard
Metric Level 11 300 metres (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 8 400
metres is expressed as “M0840”.
A3-4 Air Traffic Management (PANS-ATM)
1/11/01
1.6.3 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;
b) from 2 to 5 characters, being the coded designator
assigned to an en-route point;
c) 4 numerics describing latitude in degrees and tens and
units of minutes, followed by “N” (meaning “North”)
or “S” (South), followed by 5 numerics describing
longitude in degrees and tens and units of minutes,
followed by “E” (East) or “W” (West). The correct
number of numerics is to be made up, where necessary,
by the insertion of zeros, e.g. “4620N07805W”;
d) 2 numerics describing latitude in degrees, followed by
“N” (North) or “S” (South), followed by 3 numerics
describing longitude in degrees, followed by “E”
(East) or “W” (West). Again, the correct number of
numerics is to be made up, where necessary, by the
insertion of zeros, e.g. “46N078W”;
e) 2 or 3 characters being the coded identification of a
navigation aid (normally a VOR), followed by 3
decimal numerics giving the bearing from the point in
degrees magnetic followed by 3 decimal numerics
giving the distance from the point in nautical miles.
The correct number of numerics is to be made up,
where necessary, by the insertion of zeros, e.g. a point
at 180° magnetic at a distance of 40 nautical miles
from VOR “FOJ” would be expressed as
“FOJ180040”.
1.7 The detail of the fields
1.7.1 The elements of data prescribed or permitted to be
included in each type of field, together with a prescription of
the conditions or options permitted, are shown on pages A3-5
to A3-29.
1.7.2 A key appears at the right-hand side of each of the
field pages; this key permits the sequence of fields in each
type of message to be followed.
1.7.3 The first field in each message type is Field
Type 3; on the page describing Field Type 3 a key indicates
the field type number of the next field for each message. On
subsequent field pages, the field type number of the previous
field is shown to permit back reference also. The Start-of-
ATS-Data Signal ‘(’ is used in the key to indicate that there is
no previous type of field; the End-of-ATS-Data Signal ‘)’ is
used to indicate that there is no next type of field.
1.7.4 On the field pages,
1.8 Accuracy in the preparation
of ATS messages
Where the standard ATS messages are transmitted by
teletypewriter channels in areas where ATC computers are
known to be in use, the formats and data conventions
prescribed in the field tables on pages A3-5 to A3-29 shall be
adhered to rigorously.
elements with a fixed number of characters
are shown diagrammatically as
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