How common is it for birds to collide with aircraft? And that resulted in some recommendations from the NTSB, including different ways of certifying engines." Apparently a bird played a role in the emergency landing in Ohio on Sunday. For example, the most famous bird strike event - which didn't result in engine fire but did result in failure - is the Hudson River Landing. There's usually some kind of manufacturing, maintenance or an operational process that can be improved. And when these things happen, they don't kind of just happen. "Foreign object damage - in the form of, normally, birds - can also lead to engine fires. Or you can have a failure of some of the metal components within the engine. "Under the umbrella of mechanical malfunction, you can have a leak of a flammable fluid where it's not supposed to be, like hydraulic fluid or fuel can be leaking due to a problem in the plumbing, basically. "A couple of broad categories," Kiernan said. I think it's important to keep in mind that we have 45,000 flights handled by air traffic control every single day, so when these events happen, they're very salient, but they're also extremely rare." What is usually the cause of an engine fire on an airplane? "Mechanical malfunction, engine fire, engine shutdown, engine failure - all of these are extremely rare events. "One thing you can say for sure is that it's extremely rare," Kiernan said. How common are engine fires and mechanical issues on commercial aircraft? Story continues On Thursday, a different American Airlines flight due to fly from North Carolina to Dallas was canceled due to an engine fire, according to the FAA. In either case, something unexpected and undesired is happening within the engine, and the outcome of that in terms of what the cockpit crew does is probably similar, but it may not be an 'engine fire.'" So something that produces flames that appear to be coming out of the engine may not activate engine fire indications in the cockpit or in the engine. Engines are always on fire - that's how they create thrust - but it's a controlled ignition process. "However, it may not meet the indications of the fire occurring within the engine but outside the combustion chamber. "Flames coming out of an engine may appear to be engine fire," Kiernan said. What's the difference between an engine fire and a "mechanical issue" that appears to cause fire from the engine? (Ryan Brink via Facebook) Officials aren't referring to this as an "engine fire," but photos and video of the incident show what appear to be flames coming out of the plane. What appears to be blood is smeared across part of the aircraft's exterior. This conversation has been lightly edited for length and clarity. Yahoo News spoke with Kristy Kiernan, associate director of the Boeing Center for Aviation and Aerospace Safety at Embry-Riddle Aeronautical University, to better understand what can cause fiery mechanical issues on commercial aircraft. In a statement, American Airlines attributed the incident to a "mechanical issue.” John Glenn Columbus International Airport tweeted that the emergency landing involved a “reported engine fire” but later tweeted a correction saying that “the aircraft experienced mechanical issues, not an engine fire.” "Damn geese! First time seeing a fire and being involved in an emergency landing!" Ryan Brink, who was on the flight, posted on his Facebook page, along with a photo showing what appears to be blood smeared across part of the aircraft's exterior. Video of the plane appears to show flames shooting out on one side as the aircraft made its way back to Columbus. No one was injured, and the Federal Aviation Administration is investigating the incident. en route to Phoenix, according to the tracking site FlightAware. The Boeing 737 commercial jet returned to John Glenn Columbus International Airport about 30 minutes after taking off at 7:45 a.m. We’ve had a bird strike and an engine failure,” the crew said when reaching out to controllers, according to CNN. An American Airlines flight made an emergency landing at its departure airport in Columbus, Ohio, Sunday morning after a bird allegedly struck the engine.
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