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4 NUMERICS giving the time of the last two-way contact.
(d) Frequency of Last Contact
NUMERICS as necessary giving the transmitting/receiving frequency of the
last contact.
(e) Last Reported Position
The last reported position expressed in one of the data conventions of 1.6 of
this Appendix followed by the time over that position.
FIELD TYPE 20
Previous
type of
field or
symbol
This type
of field
is used in
Next type
of field
or
symbol
19 ALR )
Appendix 3 A3-27
1/11/01
Field Type 20 (cont.)
Example: –USAF LGGGZAZX 1022 126.7 GN 1022
PILOT REPORT OVER NDB ATS UNITS
ATHENS FIR ALERTED NIL
(f) Method of Determining Last Known Position
Plain language text as necessary.
(g) Action Taken by Reporting Unit
Plain language text as necessary.
(h) Other Pertinent Information
Plain language text as necessary.
A3-28 Air Traffic Management (PANS-ATM)
1/11/01
Field Type 21 — Radio failure information
SINGLE HYPHEN
Example: –1232 121.3 CLA 1229 TRANSMITTING ONLY 126.7
LAST POSITION CONFIRMED BY RADAR
Format: – (sp) (sp) * (sp)
(*SIX elements in all)
This field consists of the following specified sequence of elements preceded by a
single hyphen and separated by spaces. Any information not available is to be shown
as “NIL” or “NOT KNOWN” and not simply omitted.
(a) Time of Last Two-way Contact
4 NUMERICS giving the time of the last two-way contact with the aircraft.
(b) Frequency of Last Contact
NUMERICS as necessary giving the transmitting/receiving frequency of the
last two-way contact with the aircraft.
(c) Last Reported Position
The last reported position expressed in one of the data conventions of 1.6 of
this Appendix.
(d) Time at Last Reported Position
4 NUMERICS giving the time at the last reported position.
(e) Remaining COM Capability
LETTERS as necessary identifying the remaining COM capability of the
aircraft, if known, using the convention of Field Type 10, or in plain language.
(f) Any Necessary Remarks
Plain language text as necessary.
FIELD TYPE 21
Previous
type of
field or
symbol
This type
of field
is used in
Next type
of field
or
symbol
7 RCF )
Appendix 3 A3-29
1/11/01
Field Type 22 — Amendment
SINGLE HYPHEN
/
Format: – a / b
(a) Field Indicator
ONE OR TWO NUMERICS giving the type number of the field to be
amended.
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
FIELD TYPE 22
Previous
type of
field or
symbol
This type
of field
is used in
Next type
of field
or
symbol
16 CHG *22 or)
16 CDN *22 or)
* Indicates that further
fields of this type may
be added.
A3-30 Air Traffic Management (PANS-ATM)
1/11/01
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
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