Sector D is a Copenhagen lower sector, covering the middle part of Copenhagen FIR with an upper limit of FL285 to the south and FL245 to the north. It operates on 133.150 MHz.

The main tasks of sector D are:

• Descend and arrival instructions for Copenhagen arrivals via TUDLO, TESPI
• Initial climb for Copenhagen departures via Odin VOR ODN, MIKSI, GOLGA
• Descend and arrival instructions for Billund arrivals, and initial climb for Billund departures
• Traffic to and from other regional aerodromes

The most significant traffic stream in Sector D will normally be Copenhagen arrivals via TUDLO. It is advisable to make use of speed restrictions to ensure an orderly flow of traffic toward Copenhagen TMA. Traffic to and from regional aerodromes may cross the stream of arriving traffic to Copenhagen, which should be considered when issuing level changes for such traffic.

When there is no local ATC at Billund, the Billund local airspace is covered by Sector N. Sector D shall advice Bremen (EDWW-N) of the runway-in-use at Billund.

Sector D is usually combined with Sector B, and can also be combined with the other Copenhagen sectors if all Copenhagen sectors are operated by a single controller.