What happened
On September 11, 2016, an Embraer E170 operated by a commercial airline was performing a takeoff from Warsaw Chopin Airport (EPWA). During the climb phase, the flight crew received several critical system failure messages, specifically "AVNX MAU 3B FAIL" and "AVNX MAU 2A FAIL," which indicated spoiler and brake faults.
Upon receiving these alerts, the crew notified the airline's Operations Center and Maintenance Control Center (MCC). Following standard operating procedures, the decision was made to abort the flight and return to the airport. The aircraft landed safely at EPWA and taxied to the parking stand without further incident. Weather conditions at the time of the event were not a contributing factor.
The investigation
The investigation focused on determining the origin of the sudden appearance of the spoiler and brake fault messages. The investigation established that the electrical system experienced a transient state caused by the tripping of a specific circuit breaker.