E170 / F900, en-route, east of Varna Bulgaria, 2015

E170 / F900, en-route, east of Varna Bulgaria, 2015

Summary

On 30 June 2015 the crew of an en route Embraer 170 failed to notice that their transponder had reverted to Standby and the ATC response, which involved cross border coordination, was so slow that the aircraft was not informed of the loss of its transponder signal for over 30 minutes by which time it had already passed within 0.9nm of an unseen Dassault Falcon 900 at the same level. The Investigation found that the Embraer crew had failed to follow appropriate procedures and that the subsequent collision risk had been significantly worsened by a muddled and inappropriate ATC response.

Description

On 30 June 2015, an Embraer ERJ 170 (SP-LDK) being operated by LOT Polish Airlines on a scheduled international passenger flight from Warsaw to Istanbul as LOT 7293 lost prescribed separation in day VMC against an unseen Dassault Falcon 900 (VP-CGD) being operated by Volkswagen Air Service on an international passenger flight from Stuttgart to Muscat as WGT62N. Both aircraft were level at FL370 in Class 'C' airspace but only the Falcon 900 was in contact with the relevant ATC frequency at the time of the near collision.

Investigation

After the classification of the event as a Serious Incident by the Aircraft Accident Investigation Unit at the Aircraft, Maritime and Railway Accident Investigation Unit Directorate at the Ministry of Transport, Information Technology and Communications, an Investigation Commission was appointed by the Minister. Recorded ATC data from both ACCs involved - from the FDR of the E170 and from the NVM of its CMC (Central Maintenance Computer) - were available to inform the Investigation.

It was noted that the 47 year-old E170 Captain had been employed by LOT for 18 years and had accumulated 12,100 total flying hours including 3,300 hours as a Captain on type. The 45 year-old E170 First Officer had been employed by LOT for 4 months and had accumulated 4,600 total flying total hours of which 1,026 hours were on type.

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