Mass production is scheduled in 3 months, but required certifications take at least 6 months. What should the project manager do next?

The project manager's immediate next step should be to assess and evaluate the certification process. This involves understanding the specific requirements, identifying potential bottlenecks, and determining the best-case and worst-case timelines. Without this detailed information, any proposed solutions, such as extending the timeline or hiring a consultant, would be based on assumptions rather than facts. Discussing an extension with the sponsor or senior management without a clear understanding of the problem and potential solutions is premature. Engaging a consultant might be a viable solution, but only after a thorough assessment reveals its necessity and feasibility.