Final answer:
Damage caused by failed internal engine components is not considered FOD because it does not involve external objects. FOD refers specifically to damage from foreign objects.
Step-by-step explanation:
The term FOD, or Foreign Object Damage, refers specifically to damage caused by foreign objects that are not part of the aircraft or engine. If internal engine components fail and cause damage, it is not typically considered FOD because the damage is a result of the engine's own components, rather than an external object. An example of FOD would be damage from debris on a runway being ingested by an engine, not the failure of the engine components themselves.