A PDF can be a digital document coded in Postscript.
PFD is a personal flotation device, a life jacket or similar buoyancy aid
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A type V (5) PFD is a Special use, or windsurfing PFD.
Every time the PFD is worn
offshore PFD
Type, I, II, or III PFD
Every time the PFD is worn
discard because they are unusable
We do not know what you mean by "PFD", please do not use abbreviations. But the answer would be when the instructions for the "PFD" say it needs to be replaced.
Every time the PFD is worn
Proper size and comfort. No PFD can help if you do not wear it.
how many straps there are on the PFD.
Every time the PFD is worn
Every time the PFD is worn