From LASORS, detailing instrument rating instruction, with a bit about the ME. An FI rating will be needed.
H2.1 INSTRUMENT RATING INSTRUCTOR
(AEROPLANE) (IRI(A))
Privileges
The privileges of the holder of an IRI(A) rating are
limited to conduct flight instruction for:
a. The issue of an IR(A) single-engine aeroplanes;
b. The issue of an IR(A) multi-engine aeroplanes,
provided that the instructor meets the
requirements of JAR-FCL 1.380(a).
Requirements
a. The applicant for an IRI(A) shall hold a valid
IR(A).
b. Have completed at least 800 hours of flight time
under IFR of which at least 400 shall be in
aeroplanes. Where pilots have recorded flight by
sole reference to instruments and not under IFR,
then 1 hour sole reference to instruments may be
counted as 4 hours flight by IFR.
c. Successfully completed at an approved FTO and
approved course (see Appendix 1 to JAR-FCL
1.395 and AMC FCL 1.395) comprising
theoretical knowledge instruction and at least ten
hours of flight instruction on an aeroplane, flight
simulator or FNPT II; and.
d. Pass the relevant elements of a FI Skill Test in a
single pilot aeroplane with a suitably qualified
FIE(A).
e. IRI(A)’s who wish to conduct training for a ME IR
are also required to have met the qualifications
for a ME CRI. Where both courses are conducted
together, the teaching and learning element is
common to both CRI and IRI courses.
Candidates qualifying for the teaching and
learning exemption in accordance with Appendix
1 to JAR-FCL 1.395(2) who combine both ME
CRI and IRI qualifications on one course will be
required to complete a minimum of 15 hours
theoretical training before attempting the ME CRI
and IRI Skill Tests. The IRI(A) rating is designed
to train instructors to teach for the JAA IR within
an approved FTO. In the UK, the same (IRI)
qualification course is also used to qualify
instructors to teach for the UK National IMC
rating. The entry requirements for the IRI course
to teach solely for the UK IMC rating are detailed
in Section H1.4 (Removal of No Applied
Instrument Restriction). The theoretical ground
training requirements shall be the same as those
required for the IRI qualification.