JAR-FCL 2 SUBPART D COMMERCIAL PILOT LICENCE (Helicopter) CPL(H)
...
JAR-FCL 2.155
...
(b) Modular courses
(1) Experience. An applicant for a CPL(H) who is not a graduate from an integrated flying training course shall have completed as a pilot on helicopters having a certificate of airworthiness issued or accepted by a JAA Member State at least 185 hours of flight time.
(2) Crediting. From the 185 hours of flight time:
[(i)] 20 hours as pilot-in-command holding a PPL(A); or
[(ii)] 50 hours as pilot-in-command holding a CPL(A) [ ] may have been completed in aeroplanes; or
[(iii)]10 hours as pilot-in-command in touring motor gliders or gliders.
Flight time in N-registered helicopters might be of no use to get a JAA-CPL(H).