### d. Action taken for Boeing 787 Battery Trouble Measures

Battery trouble occurred on Boeing 787 in January 2013, causing a suspension of flights lasting several months. For this case, the airlines were requested to make a proper disclosure of safety information to users in addition to battery improvements. Afterwards, a similar trouble occurred with a Boeing 787 on the ground in January 2014. MLIT concluded in the assessment report on that trouble released in December 2014, it was confirmed that corrective measures taken in light of the trouble cases occurred in the previous year were effectively functioned and, from the view point of ensuring safety and security of users, it was necessary that close cooperation continue to be kept with aviation stakeholders involved including those of the United States and other relevant countries.

## (2) Developing Air Traffic Systems for Aviation Safety

Since the majority of serious incidents concerning air traffic services originates from human error, measures to prevent human error such as miscommunication between controllers and pilots and installation of visual display and transmission systems for controllers and pilots are being promoted.

Since the demand for operation of small aircraft such as helicopters is increasing for such missions as disaster response, development of low altitude routes considering its operational characteristics is being evaluated as well.

## 5 Determining the Causes of Aircraft, Railway, and Marine Accidents/Serious Incidents and Preventing Recurrence

The Japan Transport Safety Board launched the operation of “Japan-Marine Accident Risk and Safety Information System (J-MARISIS) Global Version” from April 2014. Using this system, regarding marine accidents occurred all over the world, the accident investigation reports (English Version) that the Japan Transport Safety Board has investigated as well as the accident investigation reports released by foreign Marine Accident Investigation Authorities (Australia, the United States, France, New Zealand, the Netherlands, Canada, and the United Kingdom) can be searched from the world map.

With respect to the accidents/serious incidents investigation, 25 cases of aircraft accident investigation reports were

released, and five recommendations and two safety recommendations were issued. In January 2013, a Boeing 787-8 made an emergency landing at the Takamatsu Airport because the main battery of Boeing 787-8 caused a thermal runaway during the airplane's takeoff climb, and executed emergency evacuation on taxiway. For this serious incident, a safety recommendation was issued to the Federal Aviation Administration of the United States to review the technical standards for lithium ion battery.

In addition, 18 cases of railway accidents/serious incidents investigation reports were released. Amongst these, the MLIT held a review committee to study the effective measures to prevent uneven loading in the containers, based on the investigation report of the derailment accident that occurred in Hokkaido in April 2012. Moreover, in the investigation report of the derailment that occurred in Hokkaido in September 2013, the Japan Transport Safety Board stated measures to prevent the recurrence of accidents such as ensured implementation of inspection and maintenance of the track.

Furthermore, 1,079 cases of marine accidents/incidents investigation reports were released, and six safety recommendations were issued. Amongst these, for the fire accident happened on a vessel in Hokkaido in May 2013 which