AT76, en-route, east of Cork Ireland, 2016

AT76, en-route, east of Cork Ireland, 2016

Summary

On 24 August 2016, an ATR 72-600 experienced a static inverter failure which resulted in smoke and fumes which were identifiably electrical. Oxygen masks were donned, a MAYDAY declared and after the appropriate procedures had been followed, the smoke / fumes ceased. The Investigation noted a long history of capacitor failures affecting this unit which continued to be addressed by successive non-mandatory upgrades including another after this event. However, it was also found that there was no guidance on the re-instatement of systems disabled during the initial response to such events, in particular the total loss of AC electrical power.

Description

On 24 August 2016, an ATR 72-600, (EI-FCY) being operated by Stobart Air on a scheduled international passenger flight from Birmingham to Cork for Aer Lingus Regional in day VMC experienced indications of two simultaneous electrical faults followed by another indicating electrical Smoke which was followed by the sight and smell of electrical smoke in the flight deck. A MAYDAY was declared and the smoke / smell cleared on completion of the electrical smoke checklist but the flight had to be completed without any AC electrical power available but was otherwise without further events.

Investigation

An Investigation was carried out by the Irish AAIU. The 39 year-old Captain, who was PF for the flight, had a total of 6,850 flying hours on type and a total of 4,230 hours in command but her total flying hours on all types and her total time in command of the ATR72 were not recorded. The 33 year-old First Officer was recorded as having a total of 1,892 flying hours on type but their time on all types was not recorded.

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