Any San Marino registered aircraft planning to conduct steep approaches to airports where the initial approach angle is 4½° or greater (such as London City (EGLC) in the UK, Sion (LSGS) and Lugarno (LSZA) in Switzerland), require an approval from the CAA before the commencement of operations.
CAP 27 _ Steep Approach Operations provides information on the application, required equipment, the approval process, as well as guidance on operational procedures and training.
A formal application to obtain a steep approach approval can be made using Form SM 135 (GA) or Form SM 135A (CAT).