Stockholm Sector 3 is an all level sector covering an area of airspace to the west of Stockholm. It has a lower limit of FL285 in the eastern of the sector, where Sector 2 extends beneath it. Sector 3 operates on 131.125 MHz.

The main tasks of Sector 3 are:

• Initial descent for Stockholm arrivals via ELTOK
• Climb for Stockholm departures via ARS
• En-route traffic in the sector

The main en-route traffic flows are west to east between Oslo and Helsinki, and vice versa, and south to north-east to northern Finland, which makes the area immediately around Stockholm the main conflict area. The traffic flow is highly season dependant, with more traffic toward northern Finland during the winter months.

Depending on the expected traffic flow, Sector 3 is usually combined with Sector 4, and may also be combined with Sector 2.