Final answer:
If an operator fails PMCS in Phase III, they must report the issue to their supervisor and not attempt to fix it immediately or ignore it to ensure safety and proper maintenance protocol.
Step-by-step explanation:
In Phase III, if an operator failed PMCS (Preventive Maintenance Checks and Services), the next step would be to report the issue to the supervisor. This is important because ignoring or delaying the report of the issue could lead to unsafe conditions or further damage. The operator should not continue with the mission if the equipment is not in proper working order, nor should they attempt to fix the issue immediately without reporting it, as there are protocols to follow that ensure safety and proper recording of maintenance issues.