3.1 Modes of operation

For the purpose of this document, the concept of remote aerodrome ATS is categorised into the following two main modes of operation: single mode of operation; and multiple mode of operation. For both modes, ATS may be provided either as aerodrome control service (ATC) or aerodrome flight information service (AFIS). Irrespectively of single or multiple mode of operation, remote aerodrome ATS could be implemented/provided both for the case when there is already a conventional tower at the aerodrome concerned, or for the case when there currently is no conventional tower. The provision of remote aerodrome ATS could be performed on a permanent basis (fully replacing the conventional tower, if one exists) or it could be performed on a temporary basis; for example, during specific times such as during the night or for specific events, or it could be performed for contingency purposes (e.g. where a remote tower is used as backup facility for a conventional tower). When providing remote aerodrome ATS, the operational application will vary depending on various factors such as the operational environment and the individual needs of stakeholders (as is the case in any ATS provision).