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Southwest 1380

Printed page label not indexed. PDF page 7.

.....................................................................................56 Figure 21. Location of the radial restraint fitting on the fan cowl and in relation to the fan case. ...............................................................................................................
Open official document at PDF page 7Left Engine Failure and Subsequent Depressurization: Southwest Airlines Flight 1380, Boeing 737-7H4, N772SW, Philadelphia, Pennsylvania, April 17, 2018

Southwest 1380

Printed page viii. PDF page 11.

imparted significant loads into the fan cowl (also part of the nacelle) through the radial restraint fitting, which was located at the bottom of the inboard fan cowl. 3 These loads caused cracks to form in the fan cowl skin
Open official document at PDF page 11Left Engine Failure and Subsequent Depressurization: Southwest Airlines Flight 1380, Boeing 737-7H4, N772SW, Philadelphia, Pennsylvania, April 17, 2018

Southwest 1380

Printed page ix. PDF page 12.

time). In addition, FBO-generated 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
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 label not indexed. PDF page 13.

six o'clock position because of the proximity of this fan blade impact location to the radial restraint fitting (at the bottom of the inboard fan cowl). It is important that the interaction of the fan case, radial restraint fitting, and
Open official document at PDF page 13Left Engine Failure and Subsequent Depressurization: Southwest Airlines Flight 1380, Boeing 737-7H4, N772SW, Philadelphia, Pennsylvania, April 17, 2018

Southwest 1380

Printed page label not indexed. PDF page 14.

fan blade with the fan case imparted significant loads into the fan cowl through the radial restraint fitting and (2) the associated stresses in the fan cowl structure exceeded the residual strength of the fan cowl, causing its failure.
Open official document at PDF page 14Left Engine Failure and Subsequent Depressurization: Southwest Airlines Flight 1380, Boeing 737-7H4, N772SW, Philadelphia, Pennsylvania, April 17, 2018

Southwest 1380

Printed page label not indexed. PDF page 15.

Boeing 737 next-generation-series airplanes to a fan-blade-out impact location near the radial restraint fitting and the effects of such an impact on the structural integrity of the fan cowl. Given the results of CFM's engine fan-blade-out (FBO) containment certification
Open official document at PDF page 15Left Engine Failure and Subsequent Depressurization: Southwest Airlines Flight 1380, Boeing 737-7H4, N772SW, Philadelphia, Pennsylvania, April 17, 2018