PhreeZone 20 #1 May 21, 2013 http://unitedparachutetechnologies.com/PDF/Support/Product%20Service%20Bulletins/PSB_2013205.pdf Y Mod straps are now 100% mandatory by December 1st 2013 on every tandem jump with a UPT TV3-SH harness. UPT is selling the kits at cost to retrofit harnesses.Yesterday is history And tomorrow is a mystery Parachutemanuals.com Quote Share this post Link to post Share on other sites