Some interesting wording excerpts from a fairly recent (Dec.2006) SAC international patent application document filed with WIPO :
" ..............
.......The United States Department of Defence (U.S. DoD) currently imposes a requirement that all rotorcraft transmission systems be able to operate for a predetermined period of time in an oil-out condition. That is, the U.S. DoD requires that all transmissions have the capability to maintain flight operations, albeit at reduced power levels sufficient only to sustain level flight operations, under an oil-out condition for 30 to 60 minutes depending on the mission. For example, a transmission is required to operate, for a period of time, in the event that the flow of lubricating oil to the transmission is interrupted or terminated so that the rotorcraft may safely land. ..................
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Present Invention
The emergency lubrication system of the present invention will enable a typical transmission to more than double, maybe ten times, the time period under which a transmission system may operate under oil-out conditions. Moreover, the present oil system is capable of satisfying the U.S. DoD imposed requirements for all areas/components within the transmission system. ...................".
So, as we say around here, where's it at ?
