220.127.116.11.1 Radiotelephony call signs for aeronautical stations
18.104.22.168.1.1 Aeronautical stations in the aeronautical mobile service shall be identified by:
b) the unit or service available.
22.214.171.124.1.2 The unit or service shall be identified in accordance with the table below except that the name of the location or the unit/service may be omitted provided satisfactory communication has been established.
126.96.36.199.2 Radiotelephony call signs for aircraft
188.8.131.52.2.1 Full call signs
184.108.40.206.2.1.1 An aircraft radiotelephony call sign shall be one of the following types:
Type a) — the characters corresponding to the registration marking of the aircraft; or
Note 2. The telephony designators referred to in Types b) and c) are contained in Doc 8585 — Designators for Aircraft Operating Agencies, Aeronautical Authorities and Services.
Note 3. Any of the foregoing call signs may be inserted in field 7 of the ICAO flight plan as the aircraft identification. Instructions on the completion of the flight plan form are contained in PANS-ATM, Doc 4444.
220.127.116.11.2.2 Abbreviated call signs
18.104.22.168.2.2.1 The aircraft radiotelephony call signs shown in 22.214.171.124.2.1.1, with the exception of Type c), may be abbreviated in the circumstances prescribed in 126.96.36.199.3.3.1. Abbreviated call signs shall be in the following form: