145.A.15
An application for the issue or change of an approval shall be made to the competent authority in a form and manner established by such authority.
AMC 145.A.15
In a form and in a manner established by the competent authority means that the application should be made on an EASA Form 2 (refer to Appendix III to AMC to Part-145).
Note: Consult your competent authority for the latest revision of the EASA Form 2