Send this page to someone via email

A faulty plane engine that led to a fatal incident and emergency landing this week has prompted airlines around the world to take stock of their own aircraft.

READ MORE: Passenger killed after engine fails, window shatters on Southwest Airlines flight

Tuesday’s incident, which involved a Southwest Airlines flight carrying 149 passengers, was caused by a CFM56-7B engine that blew and broke windows. One woman was killed after being partially sucked out of a window opening.

While an investigation into the incident has not concluded, the U.S. National Transportation Safety Board (NTSB) said it appears that metal fatigue was to blame for the broken engine.

WATCH: Was the Southwest Airline incident preventable?

4:37 Was the Southwest Airline incident preventable? Was the Southwest Airline incident preventable?

Similar 2016 incident

It has emerged that a similar incident occurred on a Southwest flight in 2016, and was also blamed on metal fatigue. Both incidents involved an engine fan blade being detached.

Story continues below advertisement

“In aviation, there should be inspection techniques and procedures in place to detect something like (metal fatigue),” said NTSB chairman Robert Sumwalt, according to CNN. “What we want to find out is why was this not detected ahead of time.”

WATCH: Texas firefighter ‘didn’t hesitate’ to pull woman back onto Southwest plane

1:22 Texas firefighter ‘didn’t hesitate’ to pull woman back onto Southwest plane Texas firefighter ‘didn’t hesitate’ to pull woman back onto Southwest plane

The Associated Press reported Thursday that engine manufacturers pushed the airline to check fan blades within 12 months following the 2016 incident, but Southwest said it needed more time.

The incident also prompted other industry groups to call for inspections.

WATCH: Flight attendants urge calm on tense Southwest flight

0:43 ‘Everybody breathe’: Flight attendants urge calm on tense Southwest flight ‘Everybody breathe’: Flight attendants urge calm on tense Southwest flight

How many of these engines are there?

According to the engine’s manufacturer, CFM International, there are more than 8,000 CFM56-7B engines currently in use on Boeing 737 aircrafts.

Story continues below advertisement

The company’s website boasts that makes it “the most popular engine-aircraft combination in commercial aviation.”

It’s important to note, however, that not all planes with such engines need inspections. The U.S. Federal Aviation Administration (FAA) estimated that only a few hundred need to be looked at, according to BBC News.

READ MORE: Audio released of Southwest Flight 1380 emergency

Canadian airlines respond to incident

In an email to Global News, Air Canada explained that it is not affected by this issue.

“Air Canada does not have this type of engine in its fleet, nor do we operate this particular model of aircraft,” the statement read.

Porter Airlines gave a similar statement: “No, we don’t use those engines, so there is no action required.”

READ MORE: WestJet to ‘accelerate’ inspections after fatal Southwest engine explosion

WestJet, however, said that is it has been inspecting CFM56-7 engines since a 2017 directive from the European Aviation Safety Authority urged airlines to do so by next year. Following this week’s incident, it will “accelerate” the process.

The Calgary-based airline added that less than 20 per cent of its Boeing 737NG aircraft have the fan blades in question.

Story continues below advertisement

“All WestJet aircraft have regularly scheduled maintenance checks that are compliant with regulations and completed based on time and usage,” it added.

WATCH: Southwest Airlines says it’s not aware of issues with plane involved in emergency landing

0:40 Southwest Airlines says it’s not aware of issues with plane involved in emergency landing Southwest Airlines says it’s not aware of issues with plane involved in emergency landing

Airlines around the world inspect their aircrafts

Southwest is among the airlines promising to inspect its machines in wake of the fatal incident. On Thursday, the FAA ordered the airline to inspect at least 220 engines.

Korean Air Lines said on Wednesday it planned to carry out voluntary inspections of engines used on its entire Boeing 737 fleet by November.

Story continues below advertisement

Japan Airlines said two Boeing 737 jets in its fleet had engines with affected fan blades, and inspections were due to be completed on Wednesday.

Dubai-based budget carrier flydubai said it had implemented the European directive ahead of the deadline.

Ireland’s Ryanair, which is Europe’s largest Boeing 737 operator, said fewer than 70 of its 440 planes were fitted with identical CFM56-7B engines and that all had been inspected.

— With files from Reuters, The Associated Press