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Délivrance des autorisations de roulage, assistance aux pilotes, selon nécessité.<br>    | Délivrance des autorisations de roulage, assistance aux pilotes, selon nécessité.<br>    | ||
Contrôle des pistes de décollages inutilsées (mais pas de celles en service). De ce fait un pilote doit généralement contacter la tour pour les emprunter ou les traverser. Sur certains terrains, le sol se coordonne avec la tour et peut donner des autorisations de traversée de piste de décollage en service.  | Contrôle des pistes de décollages inutilsées (mais pas de celles en service). De ce fait un pilote doit généralement contacter la tour pour les emprunter ou les traverser. Sur certains terrains, le sol se coordonne avec la tour et peut donner des autorisations de traversée de piste de décollage en service.  | ||
|-  | |-  | ||
| xxxx_TW  | | xxxx_TW  | ||
|   | | Tour  | ||
| Controls the ''active'' runways and the airspace up to 10 NM (nautical miles) from the airport; chooses the runways to use; clears planes for takeoff and landing, making sure that they are at least 10 NM or three minutes apart.  | | Controls the ''active'' runways and the airspace up to 10 NM (nautical miles) from the airport;<br>  | ||
 chooses the runways to use;<br>  | |||
 clears planes for takeoff and landing, making sure that they are at least 10 NM or three minutes apart.  | |||
|-  | |-  | ||
| xxxx_AP  | | xxxx_AP  | ||
|   | | Approche  | ||
| Controls the airspace up to 30 NM away from the airport, up to 18,000 ft (usually). Handles all aircraft leaving or arriving at an airport, until they are established on the ILS/have the runway in sight (then gives the plane to TWR) or are leaving their airspace to continue their flight (then hands them off to CTR). Ensures that aircraft is adequately separated.  | | Controls the airspace up to 30 NM away from the airport, up to 18,000 ft (usually).<br>  | ||
 Handles all aircraft leaving or arriving at an airport, until they are established on the ILS/have the runway in sight (then gives the plane to TWR) or are leaving their airspace to continue their flight (then hands them off to CTR).<br>  | |||
 Ensures that aircraft is adequately separated.  | |||
|-  | |-  | ||
| xxxx_DE  | | xxxx_DE  | ||
|   | | Départ  | ||
| This position is rarely used, except at busy airports; it handles all the departures and hands them off to CTR, leaving the approach controller free to handle only arrivals. Coordinates closely with the approach controller to prevent collisions.  | | This position is rarely used, except at busy airports;<br>  | ||
 it handles all the departures and hands them off to CTR, leaving the approach controller free to handle only arrivals.<br>  | |||
 Coordinates closely with the approach controller to prevent collisions.  | |||
|-  | |-  | ||
| xxxx_CT  | | xxxx_CT  | ||
| Center  | |    | ||
| Center (sector) controllers own all airspace not controlled by APP/DEP or TWR. They control the plane while en route, and get it from X to Y safely, until it can be instructed to descend and given to the approach controller  | |||
Center  | |||
| Center (sector) controllers own all airspace not controlled by APP/DEP or TWR.<br>  | |||
 They control the plane while en route, and get it from X to Y safely, until it can be instructed to descend and given to the approach controller<ref>In some areas (e.g. France) Center controllers are supplemented by Flight Service Stations (FSS), which provide useful information (weather, frequencies...) to pilots and do ''not'' offer air traffic control.</ref>.  | |||
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