DH8D / A319, vicinity Vienna Austria, 2017

DH8D / A319, vicinity Vienna Austria, 2017

Summary

On 16 June 2017 a Bombardier DH8-400 inbound to Vienna and an Airbus A319 which had just departed the same airport lost separation in the vicinity of 7,000 feet in Class ‘C’ airspace whilst under radar control. Both aircraft responded to their TCAS RAs, and minimum separation was 1.2nm laterally and 300 feet vertically - less than half the prescribed separation. The conflict followed an unintended instruction to the DHC8 to turn right rather than left onto a heading of 270°, the controller’s failure to recognise this and, finally, the inappropriate instruction to the departing A319 to resume its climb.

Description

On 16 June 2017 a Bombardier DH8-400 (OE-LGJ) operated by Austrian Airlines on a scheduled international passenger flight from Prague to Vienna and an Airbus A319 (OE-LDG) operated by Austrian Airlines on a scheduled international passenger flight from Vienna to Podgorica as OS727E lost prescribed separation in daylight and broken cloud whilst under radar control. Both flights received and responded to TCAS resolution advisories (RAs), which resolved the collision risk.    

Investigation

A Serious Incident Investigation was carried out by the Federal Safety Investigation Authority (FSIA) of the Austrian Ministry for Climate Action, Environment, Energy, Mobility, Innovation and Technology (BMK). Relevant quick-access recorder (QAR) and ATS recorded data were available.

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