Safety Belts Regulation
I am looking into the government definition of when passengers should wear safety belts.
I know common sense says "Always".
The Canadian Air Regulation 605.25 (1) (c) says "at any time during flight that the pilot in command considers it necessary" but I can't find how that statement is defined.
When is necessary (according to the regulations)?
Is it only movement on the surface, turbulence and take off / landing?
Can anyone point the way?