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Printed page 2. PDF page 18.
Aircraft Accident Report the airplane immediately began an uncommanded roll to the left. At 1103:39, the CVR recorded the sound of the cabin altitude warning horn, indicating that the cabin altitude had increased to more than 10,000 ft, and theOpen official document at PDF page 18Left Engine Failure and Subsequent Depressurization: Southwest Airlines Flight 1380, Boeing 737-7H4, N772SW, Philadelphia, Pennsylvania, April 17, 2018
Printed page 42. PDF page 58.
sampled once per second, transitioned from no warning to warning between about 1103:38 and 1103:39. The CVR recorded the sound of the cabin altitude warning horn at 1103:39, which was about 6 seconds after sounds consistent with the engine failureOpen official document at PDF page 58Left Engine Failure and Subsequent Depressurization: Southwest Airlines Flight 1380, Boeing 737-7H4, N772SW, Philadelphia, Pennsylvania, April 17, 2018
Printed page 50. PDF page 66.
seconds later, which was consistent with the time that the CVR recorded the warning (1103:39). As stated in section 1.7.2, Boeing calculated that the cabin pressure would have been 5,773 ft as the airplane was climbing through an altitude ofOpen official document at PDF page 66Left Engine Failure and Subsequent Depressurization: Southwest Airlines Flight 1380, Boeing 737-7H4, N772SW, Philadelphia, Pennsylvania, April 17, 2018