PC12 /A318, en-route north east of Toulouse France, 2010

PC12 /A318, en-route north east of Toulouse France, 2010

Summary

On 2 June 2010, an A318 crew en route from over southern France as cleared at FL290 just managed to avoid collision with a Pilatus PC12 making a non revenue positioning flight on the same track and in the same direction after detection of slight and unexpected turbulence had prompted a visual scan ahead. Earlier, the PC12 pilot cleared at FL270 had observed a difference between his available two altimeters but after getting confirmation from ATC that the altimeter on the side which also had an invalid airspeed reading was correct had assumed that one was the correctly reading one.

Description

On 2 June 2010, an Airbus A318 (F-GUGJ) being operated by Air France on a scheduled passenger flight from Lyon to Toulouse was about 90nm northeast of Toulouse when it came into very close proximity in day Visual Meteorological Conditions (VMC) with a Pilatus PC12 (EC-ISH) being operated by Norestair SL on a non revenue positioning flight from Buochs, Switzerland to San Sebastian, Spain which was travelling on the same track and in the same direction. A last minute sighting enabled a slight descent and divergent turn to be made. There was no Airborne Collision Avoidance System (ACAS) activation on either aircraft and the minimum separation after the avoiding action was estimated at between 15 and 30 metres horizontally and about 100 feet vertically.

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