An aircraft at Narita Airport was grounded due to some technical problem with the engine detected shortly before take-off. Swift actions were taken by the airport authorities who ensured all personnel and passengers were safe. An investigation into the incident is underway, as we await more details from the aviation authorities.
Air travel safety is taken very seriously in Japan. Any fault, even a minor one, is not taken lightly and aviators are bound by significant safety procedures and protocols. The public generally trust the authorities and expect them to resolve the issue completely before the plane is allowed to resume its flight schedules.
Similar to Japan, in the US and the EU, aviation safety is stringent and any faults must be addressed immediately and completely before an aircraft is re-allowed into service. Therefore, airline passengers in these regions can generally feel the same level of security originating from these regulations and protocols.