No, it is not an adverb. The word flown is the past participle of the verb to fly. It can be a verb form, participial, or adjective.
it was flown in 2014
I/You/We/They have flown. He/She/It has flown.
1912 was when the first helicopter flown
descended? Driven (in a car, as opposed to flown in a plane). Walked (as opposed to having flown somewhere.)
1912 was when the first helicopter flown
Flown is the past participle of fly.
It is flown in reverse to signal distress.
The Eagle Has Flown was created in 1991.
Bird Has Flown was created in 1969.
The past tense form is flew. Flown is the past participle. fly - flew - flown
Our prized pigeon has flown from the coop! This kite has been flown by four generations of my family. I cannot name all of the flags that have been flown over Texas.
flown fly flew flown