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https://www.tc.gc.ca/eng/marinesafety/d ... n-1324.htm
A life preserver (as far as I know) will keep your head out of the water even if you're unconscious. Not so a PFD.
EDIT: ah, there it is-
551.401 Life Saving Equipment Over Water - Life Preservers
This section contains standards of airworthiness for Life Preservers required by CAR 602.62.
In this section, a "life preserver" is a flotation device, which when properly worn by a person, will provide adequate buoyant force to support the body in a safe and stable position in water and provide a self-righting force to maintain the face above the water; (gilet de sauvetage).
Correct. PFD's simply provide additional bouyancy, with no requirement to roll you face up. My understanding is also that an aviation approved lifejacket must be dual chamber, and have a water activated light, and whistle, though I know this from training, not 'cause I can pinpoint the requirement in a regulation.A life preserver (as far as I know) will keep your head out of the water even if you're unconscious. Not so a PFD.
I would much rather have a PFD with no paper around my neck rather than a certified life jacket somewhere in the plane that I may not be able to reach.
Both are expensive, loud, and noisy.
However, when handled properly both respond well and provide great pleasure
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