The last BUT not least, the Area Control Center (Control/Center)
The Center provides radar coverage over vast distances at set altitudes. Depending on the location, aircraft should contact center between 8000 and 18 000 feet (FL80-FL1280). The center handles mainly IFR flights. This is because VFR traffic doesn’t regularly tend too fly at great altitudes.
The Center will normally provide these following instructions:
1. Give “fly direct waypoints”
2. Altitude changes and descents.
3. Give STAR’s if needed.
4. Instruct pilots to fly into a holding pattern
5. Give speed instructions.
Example of a pilot contacting london control.
1. Pilot: “London Control, Easy276 with you. Type 737, routing direct Daventry (A VOR near Birmingham) climbing through FL90 for FL160
ATC: Easy276 radar identified. Route direct to Trent! (TNT is a VOR) FL160
Pilot: Route Direct Trent FL160, Easy276
The pilot is inbound to land at Schipol from a high altitude.
Pilot: London Control, Thompson 44J with you descending through FL210 for FL90 for London City
ATC: Thompson44J, Radar contact, Expect SPEAR1A arrival for ILS 27.
Pilot: Roger. Expecting SPEAR1A for ILS27, Thompson44J