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Printed page 1. PDF page 17.
380 was uneventful until shortly after the airplane passed through flight level 320 at 1103:33. 3 At that time, the CVR recorded the sound of increased background noise. FDR data showed that, immediately afterward, the No. 1 (left) engine's fanOpen official document at PDF page 17Left Engine Failure and Subsequent Depressurization: Southwest Airlines Flight 1380, Boeing 737-7H4, N772SW, Philadelphia, Pennsylvania, April 17, 2018
Printed page 50. PDF page 66.
data showed that the left engine's fan speed decreased rapidly between 1103:32.7 and 1103:33.7. The FDR sampled the fan speed parameter once per second. To determine when, during that second, the FBO event occurred, the NTSB considered FDR lateral, longitudinal,Open official document at PDF page 66Left Engine Failure and Subsequent Depressurization: Southwest Airlines Flight 1380, Boeing 737-7H4, N772SW, Philadelphia, Pennsylvania, April 17, 2018
Printed page 81. PDF page 97.
2.4 Operational Factors 2.4.1 Checklist Performance At the time of the engine failure (1103:33), the first officer was the pilot flying, and the captain was the pilot monitoring. FDR data showed that the left engine's thrust lever was moved toOpen official document at PDF page 97Left Engine Failure and Subsequent Depressurization: Southwest Airlines Flight 1380, Boeing 737-7H4, N772SW, Philadelphia, Pennsylvania, April 17, 2018