Boeing and NASA teams struggling to resolve a persistent helium leak in the company’s Starliner spacecraft have uncovered a new problem, a “design vulnerability” that could affect its ability to fire its engines to return from space, officials said Friday.
Although the launch remains tentatively scheduled for June 1 from Cape Canaveral, Fla., the problems are the latest in a series of a setback in the plans to take people to orbit aboard the troubled spacecraft.