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Southwest 1380

Printed page label not indexed. PDF page 14.

of the airplane before the left engine failure occurred; and (4) Southwest Airlines' maintenance of the airplane. The low-cycle fatigue crack in the fan blade dovetail initiated because of higher-than-expected dovetail stresses under normal operating loads, and this c
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 70. PDF page 86.

airworthiness of the airplane before the left engine failure occurred; and (4) SWA's maintenance of the airplane. 70
Open official document at PDF page 86Left Engine Failure and Subsequent Depressurization: Southwest Airlines Flight 1380, Boeing 737-7H4, N772SW, Philadelphia, Pennsylvania, April 17, 2018

Southwest 1380

Printed page 89. PDF page 105.

of the airplane before the left engine failure occurred; and (4) Southwest Airlines' maintenance of the airplane. The low-cycle fatigue crack in the fan blade dovetail initiated because of higher-than-expected dovetail stresses under normal operating loads, and this c
Open official document at PDF page 105Left Engine Failure and Subsequent Depressurization: Southwest Airlines Flight 1380, Boeing 737-7H4, N772SW, Philadelphia, Pennsylvania, April 17, 2018

Southwest 1380

Printed page 2. PDF page 18.

microphone in their oxygen mask. 9 5 (a) According to Boeing's 737-600/700/800/900 Aircraft Maintenance Manual, for all pressurized flights, the cabin pressure altitude is determined by a pressure schedule that keeps the cabin altitude below 8,000 ft, which enables the
Open official document at PDF page 18Left Engine Failure and Subsequent Depressurization: Southwest Airlines Flight 1380, Boeing 737-7H4, N772SW, Philadelphia, Pennsylvania, April 17, 2018

Southwest 1380

Printed page 9. PDF page 25.

of the accident. 23 The dispatch release for the accident flight showed no deferred maintenance items. The airplane was equipped with two CFM International CFM56-7B24 turbofan engines, with one engine mounted under each wing. CFM International was established in 1974
Open official document at PDF page 25Left Engine Failure and Subsequent Depressurization: Southwest Airlines Flight 1380, Boeing 737-7H4, N772SW, Philadelphia, Pennsylvania, April 17, 2018

Southwest 1380

Printed page 18. PDF page 34.

before the accident. The National Transportation Safety Board's (NTSB) review of SWA maintenance records for the fan cowl during the 10 years preceding the accident found no nonroutine items for the latch hooks or latch keepers; the records showed that
Open official document at PDF page 34Left Engine Failure and Subsequent Depressurization: Southwest Airlines Flight 1380, Boeing 737-7H4, N772SW, Philadelphia, Pennsylvania, April 17, 2018