in operation vs operational

in operation and operational both are adjectives.

Word	Noun	Adjective	Verb	Adverb
in operation	No	Yes	No	No
operational	No	Yes	No	No

As adjectives, in operation and operational are synonyms defined as:

Other synonyms of in operation include operating.

in operation (adjective)	operational (adjective)
being in effect or operation	(military) of or intended for or involved in military operations
	pertaining to a process or series of actions for achieving a result
	being in effect or operation
	fit or ready for use or service