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Printed page I. PDF page 6.
caused the automatic takeoff power control system (ATPCS) sequence which resulted in the uncommanded autofeather of engine number 2 propellers. Following the uncommanded autofeather of engine number 2 propellers, the flight crew did not perform the documented abnormal and eOpen official document at PDF page 6ASC-AOR-16-06-001: TransAsia Airways Flight GE235
Printed page IV. PDF page 9.
take off if the automatic take off power control system did not arm. 5. Following the uncommanded autofeather of engine number 2, the flight crew failed to perform the documented failure identification procedure before executing any actions. That resulted inOpen official document at PDF page 9ASC-AOR-16-06-001: TransAsia Airways Flight GE235
Printed page X. PDF page 15.
engine auto feather unit (AFU) to minimize or prevent occurrences that could result in uncommanded autofeather. (ASC-ASR-16-06-010) To Pratt & Whitney Canada 1. Work with manufacturers of the auto feather unit (AFU) and aircraft to assess the current operating parametersOpen official document at PDF page 15ASC-AOR-16-06-001: TransAsia Airways Flight GE235
Printed page XVII. PDF page 22.
and Powerplant...................................................147 2.2.2 ATPCS and Uncommanded Autofeather .......................................148 2.2.3 Autofeather Unit Quality ...............................................................150 2.3 Flight OperationOpen official document at PDF page 22ASC-AOR-16-06-001: TransAsia Airways Flight GE235
Printed page 56. PDF page 89.
showed immersion damage. To troubleshoot the technical factors that contributed to the uncommanded autofeather, a continuity check of the AFU harness, which connected the AFU and No.1 torque sensor, was undertaken. According to the PW127 engine maintenance manual, all theOpen official document at PDF page 89ASC-AOR-16-06-001: TransAsia Airways Flight GE235
Printed page 57. PDF page 90.
testing. In addition, another AFU from another ATR72 aircraft that had experienced an uncommanded autofeather event42 after the GE235 occurrence was also sent to the manufacturer for examination and testing. The testing was performed at the UTAS facility in Eagan/BurnsviOpen official document at PDF page 90ASC-AOR-16-06-001: TransAsia Airways Flight GE235