Description

On 7 September 2012, an Airbus A319 being operated by Air France as AFR 1482 and a Boeing 737-500 being operated by Czech Airlines as CSA77E lost separation in the vicinity of the runway 24 Instrument Landing System (ILS) at Prague in day Visual Meteorological Conditions (VMC) when the A319 did not follow its clearance. Controller action prior to Short Term Conflict Alert (STCA) activation was able to resolve the situation and the 737 continued its ILS approach without interruption.

Investigation

An Investigation was carried out by the Czech Air Accidents Investigation Institute (AAII).

It was established that both aircraft involved in the conflict were inbound to Prague. The Czech Airlines Boeing 737 was about to become established on the ILS for runway 24 and the Air France A319 was flying a LOMKI 4S STAR and approaching the IAF at waypoint ERASU. The charted STAR instructions were that "unless otherwise instructed, after ERASU continue on heading 062°, radar vectoring will be provided". It was noted that after checking in with APP, the A319 crew asked whether APP wanted to shorten the aircraft track but the response (which was acknowledged) was "expect normal vectoring from 4000".