B752 / B752, en-route, north of Tenerife Spain 2011

B752 / B752, en-route, north of Tenerife Spain 2011

Summary

On 20 November 2011, a problem in reading the altitude labels on the ATC radar control display led to a Finnair Boeing 757 being cleared to make a descent which brought it into proximity with a Thomas Cook Boeing 757 in day VMC. Co-ordinated TCAS RAs were generated onboard both aircraft but when the Finnair aircraft failed to respond to its Climb RA and continued descent, the other aircraft, which had responded correctly to its initial RA, received a further RA to reverse their descent to a climb. The Finnair aircraft reported retaining visual contact with the other aircraft throughout.

Description

On 20 November 2011, approximately 100 nm north of Tenerife, Canary Islands, separation was lost in day Visual Meteorological Conditions (VMC) between a Boeing 757-200 being operated by Finnair on a non-scheduled passenger flight from Helsinki to Tenerife South and another Boeing 757-200 being operated by Thomas Cook AL on a non-scheduled passenger flight from Manchester to Tenerife South. None of the 460 occupants of the two aeroplanes were injured during the TCAS RA manoeuvres that followed.

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