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The Latest: Hearing on fatal Southwest Air flight concludes

FILE- In this April 17, 2018, file photo a Southwest Airlines plane sits on the runway at the Philadelphia International Airport after it made an emergency landing in Philadelphia. In new accounts released Wednesday, Nov. 14, into the April accident, the flight attendants described being unable to bring the woman back in the plane until two male passengers stepped in to help. The flight attendants told investigators at least one of the men put his arm out of the window and wrapped it around the woman’s shoulder to help pull her back in. (David Maialetti/The Philadelphia Inquirer via AP)

The Latest on a National Transportation Safety Board hearing and documents released on an investigation into a fatal engine failure on a Southwest flight (all times local):

3:50 p.m.

An investigative hearing into a broken fan blade that led to a fatal engine failure on a Southwest flight has concluded.

The majority of the National Transportation Safety Board hearing Wednesday was highly technical with testimony from representatives of the company that makes the blade and other industry officials.

Representatives from CFM International, which is owned by General Electric and France's Safran SA, also testified about testing and certification of jet engines, which are supposed to be built to prevent pieces from breaking off and flying free.

The preliminary reports on the accident showed an engine fan blade broke and debris hit the plane, killing a woman who was blown partly out a broken window. Pilots landed the crippled plane safely in Philadelphia.

The NTSB is expected to determine a probable cause for the accident in the next several months.

2:15 p.m.

An official with the company that made the fan blade that broke causing an engine failure on a fatal Southwest flight says the broken blade had made about 32,000 flights.

A spokeswoman for CFM International said Wednesday the company cannot comment on an open investigation, but added the company "responded aggressively" to complete blade inspections after the flight.

After the fatal accident, CFM recommended the use of more sophisticated tests using ultrasound or electrical currents. The company also recommended much more frequent inspections and lubrication of the blades.

Mark Habedank with CFM International said an examination of the broken blade showed it was likely beginning to suffer cracks from metal fatigue when it was last inspected in 2012, but the cracks were smaller than the inspection test with fluorescent dye used at the time could detect.

11:35 a.m.

Passengers who pulled a woman back into a plane window on a Southwest fatal flight in April describe quick actions to try to help flight attendants.

The accounts were included in new documents released Wednesday before a national safety hearing into the plane's engine failure that left one passenger dead and eight others with minor injuries. The passengers describe seeing the woman still buckled by a lap belt with her head, torso and arm hanging out of the broken window.

One passenger, an EMT, and another male passenger sitting in the row ahead of the woman say they reached out of the window to pull the woman into the plane.

The EMT and another passenger, a former school nurse, began CPR until the plane landed and emergency personnel took over.

12:05 a.m.

Federal safety officials plan to question representatives from engine maker CFM International and Boeing about the fatal accident on a Southwest Airlines jet this year.

The National Transportation Safety Board hearing Wednesday in Washington, D.C., is expected to last several hours.

The board is still investigating the April 17 accident, in which an engine fan blade broke and debris hit the plane, killing a woman who was blown partly out a broken window. Pilots landed the crippled plane safely in Philadelphia.

Investigators are focusing on the design and inspection of engine fan blades. After the accident, CFM recommended more advanced and frequent blade inspections, and regulators made those changes mandatory.

They will also look into the design of the engine housing, which is supposed to prevent pieces from breaking loose.