Transcript for NTSB speaks out after airplane engine failure
That's some good news there. We turn to the latest on that united plane's midair emergency over Colorado. The NTSB saying so-called metal fatigue may have caused the engine to blow apart shortly after takeoff as the uk bans 777s with the same engine. Our transportation correspondent gio Benitez has more. Good morning, gio. Reporter: Hey, Michael, good morning. Yeah, pieces of that engine are now being flown to the engine's manufacturer as questions rise, when was it last inspected? This morning, new images from the NTSB showing even more damage from that 777's midflight emergency over Colorado. Debris from the engine hitting the fuselage leaving this hole in the side of the plane. Luckily missing a few tank. This as we learn new details about what may have caused that engine to blow apart. Mayday, mayday. Reporter: The NTSB saying the preliminary investigation shows evidence of metal fatigue. When metal is weakened to such a point that cracks form. Investigators say one fan blade broke off hitting a second blade. For the fan blade that was fractured midspan, damage with it is consistent with it being struck when the fan played separated at the root, banged into it. Reporter: The uk banning 777s with that specific Pratt & Whitney engine from flying into its airspace. Most of those planes now grounded in the U.S. And Japan. While the engine is an older model no longer used in newer plane, more than 100777s still have them requiring deeper inspections. In this case there was a question of when were those inspections done? Were they done properly and why did this airplane have this crack that eventually led to a catastrophic engine failure? Reporter: This weekend we saw very similar incident in the Netherlands with a 747 cargo plane. Engine parts falling after a midair explosion. The debris injuring two people on the ground. Meanwhile, the engine's manufacturer Pratt & Whitney says this, that it is actively coordinating with operators and regulators to support the revised inspection interval of these engines that power those 777s. Robin. All right, gio, thank you.
This transcript has been automatically generated and may not be 100% accurate.