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Southwest 1380

Printed page ix. PDF page 12.

loads were transmitted to the fan cowl through the radial restraint fitting, which was not accounted for in the fan cowl's design, and the stresses in the fan cowl were greater than those calculated in the certification analyses. Since the
Open official document at PDF page 12Left Engine Failure and Subsequent Depressurization: Southwest Airlines Flight 1380, Boeing 737-7H4, N772SW, Philadelphia, Pennsylvania, April 17, 2018

Southwest 1380

Printed page 77. PDF page 93.

load path to the fan cowl. Thus, the transmitted loads and associated stresses were not accounted for in the structural analyses performed as part of certification, which is further discussed in section 2.3. The loads imparted through the radial restraint
Open official document at PDF page 93Left Engine Failure and Subsequent Depressurization: Southwest Airlines Flight 1380, Boeing 737-7H4, N772SW, Philadelphia, Pennsylvania, April 17, 2018

Southwest 1380

Printed page 80. PDF page 96.

loads were transmitted to the fan cowl through the radial restraint fitting, which was not accounted for in the fan cowl's design; and the stresses in the fan cowl were greater than those calculated in the certification analyses. The
Open official document at PDF page 96Left Engine Failure and Subsequent Depressurization: Southwest Airlines Flight 1380, Boeing 737-7H4, N772SW, Philadelphia, Pennsylvania, April 17, 2018

Southwest 1380

Printed page 75. PDF page 91.

inlet damage caused by the forward-traveling fan blade fragments during the accident was not observed during engine FBO containment certification testing or accounted for in the certification structural analyses, which is discussed in section 2.3. 2.2.3 Fan Cowl Departure A
Open official document at PDF page 91Left Engine Failure and Subsequent Depressurization: Southwest Airlines Flight 1380, Boeing 737-7H4, N772SW, Philadelphia, Pennsylvania, April 17, 2018