Context

8.33 KHZ CHANNEL SPACING (4) ACAS RA (4) ACKNOWLEDGEMENT (3) AERODROME INFORMATION (16) AERODROME TRAFFIC CIRCUIT (9) AFTER LANDING (8) AFTER TAKE-OFF (8) ALERTING PHRASEOLOGIES (4) APPROACH INSTRUCTIONS (28) APPROVAL REQUEST (6) AREA CONTROL INSTRUCTIONS (7) CHANGE OF CALL SIGN (2) CHANGE OF CLEARANCE (4) COMMUNICATIONS AND LOSS OF COMMUNICATIONS (5) CPDLC OPERATIONS (5) DEPARTURE INSTRUCTIONS (6) EMERGENCY DESCENT (2) ESTIMATES AND REVISIONS (7) EXPECTED APPROACH TIME (4) GNSS SERVICE STATUS (4) HOLDING (6) IDENTIFICATION (11) INFORMATION TO AIRCRAFT (7) ISSUANCE OF A CLEARANCE (11) LANDING (11) LEVEL CHANGES AND RATES (19) MAINTENANCE AND SPECIFICATION OF CRUISING LEVELS (12) MEANING OF WORDS AND PHRASES (31) METEOROLOGICAL CONDITIONS (15) NAVIGATION INSTRUCTIONS (6) NUMBERS (22) OPERATIONAL STATUS OF VISUAL AND NON-VISUAL AIDS (5) PAR APPROACH (32) PARALLEL APPROACHES (5) POSITION INFORMATION (1) REPORTS (16) RVSM OPERATIONS (8) SPEED CONTROL (10) SRA APPROACH (10) START-UP, PUSHBACK AND TOWING PROCEDURES (17) SURVEILLANCE SERVICES (24) TAKE-OFF (15) TAXI PROCEDURES (30) TRAFFIC INFORMATION (8) TRANSFER OF CONTROL (16) VECTORING FOR APPROACH (19) VECTORING INSTRUCTIONS (11)