66.A.45 Type/task training and ratings
(a) The holder of a category A aircraft maintenance licence may only exercise
certification privileges on a specific aircraft type following the satisfactory
completion of the relevant category A aircraft task training carried out by an
appropriately approved Part-145 or Part-147 organisation. The training shall
include practical hands on training and theoretical training as appropriate for each task authorised. Satisfactory completion of training shall be demonstrated by an examination and/or by workplace assessment carried out by an appropriately approved Part-145 or Part-147 organisation.
(b) Except as otherwise specified in paragraph (g), the holder of a category B1, B2 or C aircraft maintenance licence shall only exercise certification privileges on a specific aircraft type when the aircraft maintenance licence is endorsed with the appropriate aircraft type rating.
(c) Except as otherwise specified in paragraph (h), ratings shall be granted following satisfactory completion of the relevant category B1, B2 or C aircraft type training approved by the competent authority or conducted by an appropriately approved
Part-147 maintenance training organisation.
(d) Category B1 and B2 approved type training shall include theoretical and practical training and consist of the appropriate course in relation to the 66.A.20(a)
privileges. Theoretical and practical training shall comply with Appendix III to
this Part and shall have been started and completed within the three years
preceding the application for a type rating endorsement.
Looks like 3 years to me?