The FMC is a fundamental component of a modern airliner’s gadgets. It is a specialised computer system that automates a wide variety of in-flight tasks, reducing the workload on the flight crew to the point that modern civilian aircraft no longer carry flight engineers or navigators. A primary function is in-flight management of the flight plan.Aviation stakeholders said the break-in and removal of the FMC could only have been done by an insider with technical know-how.