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Printed page 3. PDF page 36.
closed. That corresponded with the beginning of an ATPCS sequence, which included the auto feathering5 of the engine number 2 (ENG 2) propellers. The master warning (MW) annunciated in the cockpit and the ENG 2 propeller pitch angles started toOpen official document at PDF page 36ASC-AOR-16-06-001: TransAsia Airways Flight GE235
Printed page 68. PDF page 101.
A single record y Code E1: Activation signal for feathering pump 2 status y Code E3: Auto feathering signal from AFU No. 2 This recording was consistent with the code 02 failure (flight controls), recorded inside the basic BITE duringOpen official document at PDF page 101ASC-AOR-16-06-001: TransAsia Airways Flight GE235
Printed page 90. PDF page 123.
engine. Many multi-engine turboprop aircraft, including the ATR72, are equipped with auto feathering propellers. Auto feathering feathers the propellers without pilot input in response to a powerplant malfunction where the engine torque value reduces below the pre-definOpen official document at PDF page 123ASC-AOR-16-06-001: TransAsia Airways Flight GE235
Printed page IV. PDF page 9.
Related to Probable Causes Powerplant 1. An intermittent signal discontinuity between the auto feather unit (AFU) number 2 and the torque sensor may have caused the automatic take off power control system (ATPCS): Not being armed steadily during takeoffOpen official document at PDF page 9ASC-AOR-16-06-001: TransAsia Airways Flight GE235
Printed page VIII. PDF page 13.
flight revealed that there were no defects reported that related to engine number 2 automatic feathering system. 4. Flight crew transferred from conventional flight instruments to a more advanced avionic suite with primary flight display, the visual pattern and informaOpen official document at PDF page 13ASC-AOR-16-06-001: TransAsia Airways Flight GE235
Printed page 20. PDF page 53.
Feathering can be performed: y Manually, by the condition lever in case of engine failure; y Automatically, in case of torque decrease at takeoff on one engine; y Manually, by the fire handle in case of engine fire; and yOpen official document at PDF page 53ASC-AOR-16-06-001: TransAsia Airways Flight GE235