B737, en-route, northwest of Philadelphia PA USA, 2018
B737, en-route, northwest of Philadelphia PA USA, 2018
Summary
On 17 April 2018, sudden uncontained left engine failure occurred to a CFM56-7B powered Boeing 737-700 when climbing through approximately FL320. Consequent damage included a broken cabin window causing rapid decompression and a passenger fatality. Diversion to Philadelphia without further significant event then followed. A single fan blade was found to have failed due to undetected fatigue. The Investigation noted that the full consequences of blade failure had not been identified during engine / airframe type certification nor fully recognised during investigation of an identical blade failure event in 2016 which had occurred to another of the same operator s 737-700s.
Description
On 17 April 2018, a Boeing 737-700 (N772SW) being operated by Southwest Airlines on a domestic passenger flight from New York La Guardia to Dallas Love Field as SWA1380 had just passed FL320 on the climb to FL380 in day VMC and was passing abeam Philadelphia when a sudden explosive noise was followed by significant airframe vibration, flight deck indications of a left engine failure and fire and of loss of cabin pressurisation. After following the prescribed immediate response procedures, the flight crew declared an emergency and diverted to Philadelphia. Fire indications ceased but a report from the cabin advised that a left side cabin window at row 14 had been broken by debris and a secured passenger seated nearby partially sucked out of it. That passenger was brought back fully into the cabin but subsequently died. Eight of the other 143 passengers sustained minor injuries but none of the five crew members were injured. After landing, substantial damage was evident on the left side of the airframe and to the left engine and related debris was subsequently found on the ground in the vicinity of the engine failure location.
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