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Printed page 14. PDF page 30.
hardness. At the time of the accident, the fan blade set had accumulated 55,471 hours and 32,636 cycles since new and 18,088 hours and 10,712 cycles since the time of the overhaul. The CFM56-7B fan blade was not certified asOpen official document at PDF page 30Left Engine Failure and Subsequent Depressurization: Southwest Airlines Flight 1380, Boeing 737-7H4, N772SW, Philadelphia, Pennsylvania, April 17, 2018
Printed page 71. PDF page 87.
potential for cracking, were predicted to occur. The accident fan blade failed with 32,636 cycles since new. Similarly, the fractured fan blade associated with the August 2016 PNS accident (see section 1.10.1), as well as the six other cracked fanOpen official document at PDF page 87Left Engine Failure and Subsequent Depressurization: Southwest Airlines Flight 1380, Boeing 737-7H4, N772SW, Philadelphia, Pennsylvania, April 17, 2018