Incident Overview
On 11 September 2016, an Embraer E170 aircraft (type only, registration not specified) was climbing after departure from Warsaw Chopin Airport (EPWA) when the flight crew received system messages indicating failures: "AVNX MAU 3B FAIL" and "AVNX MAU 2A FAIL", accompanied by "SPOILER FAULT" and "BRAKE FAULT" alerts.
Crew Actions
The crew reported the situation to the airline's Operations Center and the Maintenance Control Center (MCC). A decision was made to return to the departure airport. The subsequent landing and taxi to the parking stand were completed without further issues.
Occupants and Damage
There were 60 persons on board. No injuries, fatalities, or serious damage were reported. The weather conditions on the day were not a factor in the occurrence.
Investigation Findings
The investigation, conducted by the operator under the supervision of the Polish State Commission on Aircraft Accident Investigation, determined the cause to be the activation of the DC BUS 2 circuit breaker, which likely resulted from a temporary overload and transient state.
No preventive actions or safety recommendations were issued by the Commission or the operator.