Sorry to bring this thread up again, but things might have changed with Part 61.
"multi‑engine aeroplane means an aeroplane that has 2 or more engines, other than:
(a) a multi‑engine centre‑line thrust aeroplane; or
(b) an aeroplane that is prescribed by a legislative instrument under regulation 61.050 as an aeroplane that is included in the single‑engine aeroplane class."
So, with this, does that mean I must log 337 time as single-engine, or can I log it as multi-engine, but when it comes to flight reviews etc, a 337 cannot be used to maintain the Multi-Engine Class rating (or renew MECIR for instance).
Thinking logically (although it is Casa), flying a 337 isn't going to be much different from any other twin in normal ops, and in general practice, how often do you get an engine failure and asymmetric operations? I can understand that in flight reviews or other flight tests, that a 337 cannot be used, as in these times, asymmetric operations are to be tested on.