What happens when turbulence hits during meal service The mess after turbulence hit a Singapore Airlines flight. Picture: Alan Cross/Instagram Passenger captures chaos on board flight after turbulence Plane hit turbulence during breakfast Food and utensils were thrown around the plane THIS is why you need to keep your seatbelt fastened at all times during a flight. A photo posted on Instagram by passenger Alan Cross shows the chaos after turbulence hit a Singapore Airlines A380-800 during breakfast service. Cross said: "Severe clear air turbulence issue on my SIN-LHR flight (SQ 308). A380 suddenly dropped 50-100ft during breakfast. The flight was travelling from Singapore to London on Sunday when the unexpected turbulence struck about two hours into the flight, sending loose items such as food trays and utensils airborne and making a complete mess of the cabin. "Eleven passengers and one crew member sustained minor injuries when the aircraft experienced a sudden loss of altitude and were attended to by medical personnel on arrival at Heathrow Airport," A Singapore Airlines spokesperson said. Seatbelt signs were on at the time and meal services had already been suspended. The flight landed safely. There were a total of 328 passengers and 26 crew on board.