Q: Do these have a inspection / repack interval requirement?
Per the supplier: No. They do not require a inspection/repack interval.
Q: What is the replacement interval of the life preserver's included with this belt system? Are these life preservers a Transport Canada approved design for aviation?
This does not have a replacement interval but the life of this product generally would be about 12 years. This is also not a Transport Canada approved design but is US approved.
Q: If this is manual inflate, can I buy it, try it out and blow up, float and then repack and use again if I need to? I want to one, feel it would work and float me, two, be in practice if I do ever need in an emergency.
Yes, you can do this as long as you replace the CO2 cartridge. There is no issue at all to want to try out your jacket and replace the CO2 cartridge.
Q: Does this vest comply with TSO-13C specification?
No, this is US Coast Guard approved Type III #160.076/3025/0.