Fuel switches of the Boeing 787 Dreamliner have come under scrutiny after a preliminary crash report raised questions about how the controls were moved from the "run" to "cutoff" position, starving the engines of fuel.

Singapore Airlines on Tuesday said all fuel switches on its Boeing 787 aircraft -- as well as those belonging to its subsidiary Scoot -- are functioning properly in compliance with regulatory requirements.

Learn about the location of fuel switches on a Boeing 787 and the possibility of accidental shutoff. Explore safety features and historical incidents.