The flight-capable Airwolf helicopter was a cosmetically modified Bell 222, serial number 47085, sometimes unofficially called a Bell 222A. Registered as N3176S, shorten 76s among fans and was owned by Jetcopters, Inc. of Van Nuys, California. During filming of the last episode 'Birds of Paradise', 76s wasn't presence. Presumably it may seem that the mock-up was moved to Dark Canyon DR for the final scene when Hawke meets Kincaid as a stand in for 76s. The reason they didn't have access to 76s might have something to do with UNI's contract with Jetcopters, Inc had come to an end. 

S3 also relied heavy on stock footage.