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Excerpt taken from: WMO No. 386 Manual on the Global Telecommunication System
Part II - Operational Procedures for the GTS
ATTACHMENT II–5 - DATA DESIGNATORS T1T2A1A2ii IN ABBREVIATED HEADINGS

TABLE D3

Level designator ii (when T1T2= FA, UA)

Instructions for the proper application of the level designators

(1) 
Noting that there is no known use of the series 80-99 for T1T2=UA, these series are allocated to routine aircraft reports up to 1 September 2008. After 1 September 2008, the series should be reserved for future use.

 

T1T2
Level Designator
ii
Data Type
Code Form (name)
FA
01-49
 Aviation area /advisories FM 53 (ARFOR)/[text]
FA
50-59
 GAMET [TEXT]
FA
60-99
 Not assigned Not assigned
UA
01-59
 Routine aircraft reports ICAO AIREP
UA
60-69
 Special aircraft reports, except for volcanic ash ICAO AIREP
UA
70-79
 Special aircraft reports related to volcanic ash ICAO AIREP
UA
80-99
 Reserved for future use ICAO AIREP

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Telecommunications
Abbreaviated Heading
TTAAii CCCC
Symbolic Structure explained
Table Definitions
Table A
Table B1
Table B2
Table B3
Table B4
Table B5
Table B6
Table C1
Table C2
Table C3
Table C4
Table C5
Table C6
Table C7
Table D1
Table D2
Table D3
Indicator BBB

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