<https://www.dropzone.com/forums/topic/287720-optimum-113-dom-april-2008-maximum-weight/#comment-5036859>
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"We should get Terry Urban's opinion on this matter since he sat on the PIA Technical Committee when the Optimum was certified. Terry and I have discussed this a couple of times.\n \n\n\n\tThe old FAA TSO standard was that all reserves had to structurally survive high-speed openings at 254 pounds.\n \n\n\n\tThe second problem was descent rate with 254 pounds suspended. The smallest reserves have a steady (brakes still set at opening configuration) rate of descent too fast to meet the FAA standard, so Performance Designs asked the FAA for an exemption.\n \n"
<https://www.dropzone.com/forums/topic/287720-optimum-113-dom-april-2008-maximum-weight/?tab=comments#comment-5036580>