I think this would be a critical part of the entire scheduling for the project. The balloon did not do what it was supposed to and as a result, whatever comes after in the schedule will be delayed. In terms of the Gantt chart, the project manager will have to allocate more time for R&D to do further research and figure out the best possible course of action after this failure. Also, they might have to make certain sections longer just in case another issue comes up again so that the critical paths do not get effected too much. Whenever a problem does arise, a lot of times the project will get delayed. In this case, since a key component of the project failed, they will have to allocate a lot of time to further research and complete an investigation as to why it failed.