A Flight Simulator is in JAA terms a full motion multi-pilot device in which case you must be either a TRI or a SFI to instruct on such a device.
JAR–FCL 1.410 SFI(A) – Requirements
(See Appendix 1 to JAR–FCL 1.240)
(See Appendix 1 to JAR-FCL 1.365)
(See AMC FCL 1.365)
(a) An applicant for a SFI(A) authorisation shall:
(1) hold or have held a professional
pilot licence issued by a JAA Member State or
a non JAR–FCL professional licence
acceptable to the Authority;
(2) have completed the simulator
content of the applicable type rating course at
an approved FTO or TRTO;
(3) have at least 1500 hours flying
experience as pilot on multi-pilot aeroplanes;
(4) have completed an approved
TRI(A) course (see Appendix 1 to JAR-FCL
1.365 and AMC FCL 1.365);
(5) have conducted on a complete
type rating course at least 3 hours of flight
instruction related to the duties of a TRI(A) on
the applicable type of aeroplane under the
supervision and to the satisfaction of a TRI(A)
notified by the Authority for this purpose;
(6) have completed within a period of
12 months, preceding the application, a
proficiency check as set out in Appendix 1
and 2 to JAR–FCL 1.240 on a flight simulator
of the applicable type; and
(7) (i) have completed within a period
of 12 months, preceding the application, at
least three route sectors as an observer on
the flight deck of the applicable type or similar
type as agreed by the Authority , or
(ii) have completed within a period
of 12 months preceding the application, at
least 2 LOFT based simulator sessions
conducted by qualified flight crew as an
observer on the flight deck of the applicable
type or similar type as agreed by the
Authority. These simulator sessions shall
include:
(A) flight between 2 different
airports of at least 2 hours duration each, and
(B) associated pre-flight
planning and de-briefing.
The requirements above are fulfilled if the
applicant has been issued a specific
authorisation in accordance with Appendix 1 to
JAR-FCL 1.300 and comply with the
requirements of JAR-FCL 1.415.
(b) If the privileges are to be extended to
further types of multi-pilot aeroplanes the holder
shall have:
(1) satisfactorily completed the
simulator content of the relevant type rating
course; and
(2) conducted on a complete type
rating course at least 3 hours of flight
instruction related to the duties of a TRI(A) on
the applicable type of aeroplane under the
supervision and to the satisfaction of a TRI(A)
notified by the Authority for this purpose.
If you are referring to STDs for single pilot operation you need to meet the requirements of a STI
(b) Requirements. An applicant for a STI(A)
authorisation shall:
(1) hold or have held within the
previous 3 years a pilot licence containing an
instructional qualification appropriate to the
courses on which instruction is intended or a
non-JAA licence acceptable to the Authority;
(2) (i) have conducted in a flight
simulator or FNPT II at least 3 hours of flight
instruction related to the duties of a STI(A)
under the supervision and to the satisfaction
of an FIE(A) notified by the Authority for this
purpose;