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Usually, when the term cycles is used to discuss aircraft aluminum fatigue, they are referring to cabin pressurization cycles. For aircraft that routinely fly in the Flight Levels with pressurized cabins, especially the mid twenties and above where the differential (inside/outside pressure) becomes more extreme, this is a serious source of metal fatigue that is monitored closely, with cycles as the reference, similar to using hours for assessing TBO intervals for engines. Pressurizing when climbing to altitude and depressurizing when descending for landing counts as one cycle. The length of time the cabin is pressurized (i.e. flying to Japan vs Indianapolis) is of no consequence. Paul --- craig Aho <[EMAIL PROTECTED]> wrote: > ----[Please read http://ercoupers.com/disclaimer.htm > before following any advice in this forum.]---- > > I heard the other nite a conversation on TV about > aircraft aluminum fatigue > cycles. Has anyone ever considered that issue with > regards to our spars. > > Craig > > > --------------------------------- > to unsubscribe send > mailto:[EMAIL PROTECTED] > > > __________________________________________________ Do You Yahoo!? Yahoo! Auctions - buy the things you want at great prices http://auctions.yahoo.com/ --------------------------------- to unsubscribe send mailto:[EMAIL PROTECTED] ==^================================================================ EASY UNSUBSCRIBE click here: http://topica.com/u/?bz8Sid.bAhN69 Or send an email To: [EMAIL PROTECTED] This email was sent to: [EMAIL PROTECTED] T O P I C A -- Learn More. Surf Less. Newsletters, Tips and Discussions on Topics You Choose. http://www.topica.com/partner/tag01 ==^================================================================
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