Inflatable PFD
Must be in good, serviceable condition It is a legal requirement for a PFD to be in good, serviceable condition.PFDs must be properly sized for the intended wearer.
Wearing a "V" type PFD on a PWC!!
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.