What followed, was a loud thud, thud, thud - a bit like when a washing machine is out of balance. READ MORE:* How on-ground aircraft collisions happen* Listen: Air France mayday over engine blow out* Air NZ plane in emergency landing after engine failsMost jetliners are, however, twin-engine - so what happens if an engine needs to be shut down during the flight? The first thing to know is that twin-engine planes can, in most circumstances, comfortably fly on one engine for many hours. If not, they may shut the engine down, continue flying on one engine and declare an emergency - which means diverting to the nearest airport. This basically means the plane must be a certain number of flying hours away from a safe airport at all times.

Source: Stuff April 02, 2019 18:56 UTC