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Accident description
Last updated: 26 May 2018
Status:Preliminary
Date:Tuesday 17 April 2018
Time:ca 11:04
Type:Silhouette image of generic B737 model; specific model in this crash may look slightly different
Boeing 737-7H4 (WL)
Operator:Southwest Airlines
Registration: N772SW
C/n / msn: 27880/601
First flight: 2000-06-26 (17 years 10 months)
Engines: 2 CFMI CFM56-7B24
Crew:Fatalities: 0 / Occupants: 5
Passengers:Fatalities: 1 / Occupants: 144
Total:Fatalities: 1 / Occupants: 149
Airplane damage: Substantial
Location:105 km (65.6 mls) NW of Philadelphia, PA (   United States of America)
Phase: En route (ENR)
Nature:Domestic Scheduled Passenger
Departure airport:New York-La Guardia Airport, NY (LGA/KLGA), United States of America
Destination airport:Dallas-Love Field, TX (DAL/KDAL), United States of America
Flightnumber:WN1380
Narrative:
Southwest Airlines flight WN1380 diverted to Philadelphia Airport, Pennsylvania, USA, after suffering an in-flight uncontained engine failure.
The aircraft, a Boeing 737-700, originated from New York-La Guardia Airport at 10:43 for a flight to Dallas-Love Field, Texas. About 11:04, when the aircraft was climbing through FL325, the no.1 engine (CFM56-7B24) suffered an uncontained failure. The flight crew noticed that the no.1 engine rpm dropped to zero, as did the oil pressure. The cabin altitude horn sounded and the aircraft experienced a sudden, uncommanded, left roll of a 41° bank angle. The pilots leveled the wing, donned their oxygen masks and initiated an emergency descent. The flight crew then requested air traffic control to give them vectors to the nearest suitable airport.
As a result of the uncontained failure, a fan blade and parts of the engine cowling and engine air inlet cowl had separated. Debris impacted a window frame of row 14, causing the window and frame to break away. This resulted in a decompression of the aircraft. Additional debris impacted and damaged the leading edge of the left hand wing.
The flight was vectored towards Philadelphia Airport, where the crew requested an extended final approach due to concerns of aircraft controllability. It was decided to land with flaps 5 for that reason, and an approach speed of 165 knots. The aircraft landed on runway 27L at 11:19 hours and the aircraft was stopped on a taxiway. ARFF services attended to the no.1 engine while injured passenger who was seated near the lost window was rushed to hospital. The passenger is reported to have died.
Preliminary findings of the NTSB show that the no.13 fan blade of engine no.1 was missing. It appears to have broken away at the hub. There is evidence of metal fatigue in the area where the blade broke.
Also, a part of the no.1 engine cowling was reported to have been found at Burnville, PA.

Classification:
Forced landing on runway

Follow-up / safety actions

EASA issued 1 Airworthiness Directive
EASA issued 1 Emergency Airworthiness Directive
FAA issued 1 Airworthiness Directive
FAA issued 1 Emergency Airworthiness Directive

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Photos

photo of Boeing 737-7H4 (WL) N772SW
photo of Boeing 737-7H4 (WL) N772SW
photo of Boeing 737-7H4 (WL) N772SW
photo of Boeing 737-7H4 (WL) N772SW
photo of Boeing 737-7H4 (WL) N772SW
cowling part of engine no.1
photo of Boeing 737-7H4 (WL) N772SW
cowling part and inlet cowl part of engine no.1
photo of Boeing 737-7H4 (WL) N772SW
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Map
This map shows the airport of departure and the intended destination of the flight. The line between the airports does not display the exact flight path.
Distance from New York-La Guardia Airport, NY to Dallas-Love Field, TX as the crow flies is 2204 km (1377 miles).

This information is not presented as the Flight Safety Foundation or the Aviation Safety Network’s opinion as to the cause of the accident. It is preliminary and is based on the facts as they are known at this time.
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