Final answer:
During the first simulation practice in the film Apollo 13, the crew encountered a severe problem, but they were able to address it and continue the simulation.
Step-by-step explanation:
The first time Jack was practicing in the simulator with the rest of the Apollo 13 crew, they encountered a severe problem but were able to address it and continue the simulation. In the film Apollo 13, several issues arise during the practice session, including a fuel cell failure, which they manage to resolve.