What happened
On November 10, 2016, a Boeing 767-300, registered JA658J, was performing a scheduled departure from Kagoshima Airport to Tokyo International Airport. The flight, operated by Japan Airlines Co., Ltd., carried 118 passengers and 11 crew members.
During the initial climb, the flight crew anticipated potential instability due to cloud movement and wind changes, instructing cabin crew to keep the seat belt sign illuminated for 15 minutes. As the aircraft climbed through 10,000 feet, it encountered moderate turbulence while passing through clouds. While the aircraft's flight data recorder showed a period of relative stability, a secondary increase in vertical acceleration occurred at approximately 13:20 JST.
At this time, a cabin attendant, seated at a rear jump seat, observed an infant crawling away from their guardian into an adjacent empty seat. Attempting to intervene and call out to the guardian, the attendant unfastened her seat belt and attempted to stand. During this movement, a sudden increase in turbulence and a rightward tilt of the aircraft caused the attendant to lose her balance. She fell backward toward the floor, resulting in a bone fracture.