Engine as its own platform, needs to be managed differently compared to aircraft as it is a very special and valuable asset component.
The definition of an engine needs to be elaborate to differentiate from regular spare part, eventhough the building block of an engine is in fact another aircraft spare part as a whole.
The engine inventory registers all the engines actual components for specific aircraft tail.
Tracks the number of engines needed for a number of aircraft tail.
The number of engine shop visit required for a life of an engine.
The number of removal during the life time of the engine.