Southwest 1380
Printed page 73. PDF page 89.
manual) to detect cracks, but the crack in fan blade No. 13 was not detected. The NTSB could not determine why the crack was not detected; it is possible that the size of the crack might have been below theOpen official document at PDF page 89Left Engine Failure and Subsequent Depressurization: Southwest Airlines Flight 1380, Boeing 737-7H4, N772SW, Philadelphia, Pennsylvania, April 17, 2018