FCL.910.SFI SFI — Restricted privileges
The privileges of the SFI shall be restricted to the FTD 2/3 or FFS of the aircraft type in which the SFI training course was taken.
The privileges may be extended to other FSTDs representing further types of the same category of aircraft when the holder has:
(a) satisfactorily completed the simulator content of the relevant type rating course; and
(b) conducted on a complete type rating course at least 3 hours of flight instruction related to the duties of an SFI on the applicable type under the supervision and to the satisfaction of a TRE qualified for this purpose.
Voila!....