Refer to figures.
According to ICAO Annex 11, individual ATIS messages shall be identified by a designator in the form of a letter of the ICAO spelling alphabet. Designators assigned to consecutive ATIS messages shall be in alphabetical order.
According to ICAO Doc 4444, when ATIS information is available an aircraft entering the aerodrome circuit should report (aircraft type) (position) (level) INFORMATION (ATIS identification) FOR LANDING.
ICAO Doc 9432 (MANUAL OF RADIOTELEPHONY)
2.3 TRANSMISSION OF LETTERS
2.3.1 To expedite communications, the use of phonetic spelling should be dispensed with if there is no
risk of this affecting correct reception and intelligibility of the message.
2.3.2 With the exception of the telephony designator and the type of aircraft, each letter in the aircraft
call sign shall be spoken separately using the phonetic spelling.
ICAO Doc 8400
VOR‡ VHF omnidirectional radio range
NDB‡ Non-directional radio beacon
‡ When radiotelephony is used, the abbreviations and terms are transmitted using the individual letters in non-phonetic form.
The correct statement is that the identification letter of the current Automatic Terminal Information Service (ATIS) should always be spelled out in a transmission using the radiotelephony spelling alphabet. According to ICAO Doc 9432 the telephony designator and the type of aircraft are exceptions to the phonetic spelling. According to ICAO Doc 8400, VORs and NDBs are transmitted using the individual letters in non-phonetic form.
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