"Teacherjh" wrote in message
...

and locking the door sounds
like pretty good common sense to me


Yes, but that's not the same as being required by law to lock the door.

It makes good sense not to drink gasoline too. But I don't think there's a
law
against it (except perhaps the law against using gasoline for "other than its
intended purpose")

Of course, that assumes you have a door that locks. Or a door period. And many
of those without doors, also don't have keyed ignition switches. Makes it kind
of hard to double lock your plane.