Hatunen writes:

Plese cite the FAR.

A partial sample:

14 CFR § 91.303 Aerobatic flight
14 CFR § 23.3 Airplane categories (a) and (b)
14 CFR § 23.1567 Flight maneuver placard (b) and (d)
14 CFR § 23.151 Acrobatic maneuvers
14 CFR § 23.221 Spinning
14 CFR § 23.807 Emergency exits (b)

Well, OK. I have spun in a 150 many years ago, but this injuction
is not rally an injuction against spinning but ratehr a rather
bad design flaw that onley appera when spinning (I presume).

Either way, it's not legal to spin a 150 without the modifications mentioned
in the AD.

Also, the pilot spent too many turns in the spin (I counted nine), and in fact
it looked a lot like a spiral (increasing airspeed).

In view of hte fact you've already said spinning in a 150 was
enjoined in 2009, it soesn't apper to me to matter whether the
spin was in the USA or Canada.

The AD wouldn't necessarily apply in Canada (I don't know the Canadian
regulations).

In this case it would only be reckless had the pilot been made
aware of the design flaw. Spins are not intrinsicly reckless.

They are after nine turns.

But aircraft are not designed specifically to spin (save certain
planes designed for aerobatic use). The normal structural
integrity of a plane will allow it to spin in a quite
well-behaved manner, and the warning is really about aircraft
that shouldn't be spun.

Spins may be safe, but only within certain limits. It's up to the pilot to
respect those limits.

I've been too long out of the game to remember if there is a
certification plate in aircraft that says "OK for spin" or "Do
not spin".

The regulations mentioned above spell out what must be on the placards. I
didn't see those placards in the cockpit on the video, and yet some of them
are required for aircraft that can be spun.