JAKARTA—Indonesian authorities said they have found the voice and data recorder from a Russian jet that crashed last week during a demonstration flight, killing all 45 people on board.

The "black box" of the Sukhoi Superjet 100 was found late Tuesday at the bottom of a ravine below the dormant volcano that the flight slammed into last Wednesday. The information on the recorder will be crucial in determining what caused the tragic accident and could affect the future of Sukhoi's passenger airplane business, analysts said.

With the airline industry booming in Indonesia, particularly in the low-cost carrier segment that was keenly interested in the Sukhoi passenger planes, Sukhoi will be hoping that the recorders show that there is nothing wrong with its Superjet.