[Ref PPL Instruction Kit Vol1 (306) – 9th Edition, V9.2 P.90]
ATC service is further divided into 3 sections as follows:
Area Control Service – for flights in CTA other than during arrival (or departure);
Approach Control Service – for flights in CTA and CTR during arrival and departure; and,
Aerodrome Control Service – for flights in CTR during takeoff, landing and manoeuvring in the traffic circuit.
Traffic services provided, hours of operation and identification of ATS units (and appropriate frequencies) are published in ERSA FAC. Frequencies are also shown on ERC Low, VNCs and VTCs
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