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Printed page ix. PDF page 12.
blade involved in the PHL accident was also not detected during the on-wing fan blade visual inspections (subsequent to the overhaul) that were conducted as part of fan blade relubrications, which CFM recommended to maintain the fan blade loads withinOpen official document at PDF page 12Left Engine Failure and Subsequent Depressurization: Southwest Airlines Flight 1380, Boeing 737-7H4, N772SW, Philadelphia, Pennsylvania, April 17, 2018
Printed page label not indexed. PDF page 14.
penetrant inspection at the time of the fan blade set's last overhaul and subsequent visual inspections at the time of fan blade relubrications. The requirement to perform an eddy current inspection at the time of fan blade overhaul andOpen official document at PDF page 14Left Engine Failure and Subsequent Depressurization: Southwest Airlines Flight 1380, Boeing 737-7H4, N772SW, Philadelphia, Pennsylvania, April 17, 2018
Printed page 72. PDF page 88.
accident fan blade set were relubricated seven times; thus, there would have been seven visual inspections of the fan blades. However, no cracks were found, even though the crack on fan blade No. 13 had likely existed since October 2012Open official document at PDF page 88Left Engine Failure and Subsequent Depressurization: Southwest Airlines Flight 1380, Boeing 737-7H4, N772SW, Philadelphia, Pennsylvania, April 17, 2018
Printed page 73. PDF page 89.
detectable during the FPI at the time of the fan blade set's last overhaul and subsequent visual inspections at the time of fan blade relubrications. After the accident, the FAA issued ADs to mandate initial and repetitive ultrasonic inspections ofOpen official document at PDF page 89Left Engine Failure and Subsequent Depressurization: Southwest Airlines Flight 1380, Boeing 737-7H4, N772SW, Philadelphia, Pennsylvania, April 17, 2018
Printed page 89. PDF page 105.
penetrant inspection at the time of the fan blade set's last overhaul and subsequent visual inspections at the time of fan blade relubrications. The requirement to perform an eddy current inspection at the time of fan blade overhaul andOpen official document at PDF page 105Left Engine Failure and Subsequent Depressurization: Southwest Airlines Flight 1380, Boeing 737-7H4, N772SW, Philadelphia, Pennsylvania, April 17, 2018
Printed page 13. PDF page 29.
installation in the accident engine). 31 At that time, the overhaul process included conducting visual and dimensional inspections, stripping the dovetail coating from the blades to perform an ultra-high-sensitivity fluorescent penetrant inspection (FPI), shot-peening the 30 At thOpen official document at PDF page 29Left Engine Failure and Subsequent Depressurization: Southwest Airlines Flight 1380, Boeing 737-7H4, N772SW, Philadelphia, Pennsylvania, April 17, 2018