Incident Overview
On November 18, 2015, an Embraer 175 aircraft operated by PLL LOT was taxiing for departure at Warsaw Chopin Airport (WAW) when the flight crew received a TAT1 FAIL indication on the Engine Indication and Crew Alerting System (EICAS). The crew halted the taxi to perform a system reset. After the reset attempt was unsuccessful, maintenance personnel were called to the aircraft.
Maintenance Action
The technical team applied Addendum (ADD) 490 in accordance with Minimum Equipment List (MEL) item 34-15-03/B. Following this procedure, the aircraft was cleared for flight. The incident was recorded in the airline's Safety Management System (SMS) database and was included in the Safety Performance Indicators (SPI) monitored under the SMS policies described in the Safety Management Manual.
Cause
The cause of the incident was determined to be a malfunctioning Total Air Temperature Sensor. After the sensor was replaced, the fault did not recur. No safety recommendations were issued by the investigation body, and no injuries were reported. The investigation was completed on December 8, 2015.