Airprox Report 2013085

3
Figure 1
At 1906:00 the two aircraft were 10nm apart with the A320 descending through FL204 for FL200
and the DH8D was passing FL198 for FL90. The Welin controller instructed the DH8D to expedite
descent due to traffic above. Low level STCA activated.
At 1906:05 High level STCA activated. The Cowly controller issued avoiding action to the A320 to
turn left heading 095°. The Welin controller issued avoiding action to the DH8D to turn left heading
290°. At 1906:20 the A320 reported receiving a TCAS RA (Figure 2).
Figure 2
At 1906:22 the two aircraft were 4.1nm and 1000ft apart (Figure 3).