You don't say which country you are in but, if it's the UK, then the pilot must have a CPL(H) and be type-rated on that "small chopper".
The major difference btween fixed-wing and rotary is that rotary ratings are TYPE specific, not CLASS specific.
Cheers
Whirlygig
PS - if your friend wants tp learn to fly as well, then the pilot must also have an Instructor Rating.