OR75 Posted August 6, 2017 Report Posted August 6, 2017 Does anyone know if there is a limit on the number of pitot / static requiring devices ? Looks like more and more devices need those inputs . Encoder, VSI , altimeter , airspeed switch , G5 or SAI-340 . whats the cleanest way to install in order to avoid a bunch of tee union ?
jaylw314 Posted August 6, 2017 Report Posted August 6, 2017 I suppose you could a couple of pneumatic manifolds, like http://www.aircraftspruce.com/catalog/hapages/alummanifoldfit.php?clickkey=54711 On the other hand, then you would have a web of MULTIPLE pneumatic lines running around behind your panel. Since they can't bend as easily as wiring, it seems like that would be more of a mess than running one pneumatic line past all the devices with a short run off a t-union. 1
OR75 Posted August 7, 2017 Author Report Posted August 7, 2017 Good find. But agree the rigidity of the tubing is the issue
carusoam Posted August 7, 2017 Report Posted August 7, 2017 We have a few resources... static pressure pitot pressure vacuum system And several users of those resources... ASI VSI Altimeter AP is connected for alt hold Back-up AI w/ AS and alt anunciator panels and alarms Altitude encoder (got this from @OR75 bellow) vacuum step uses the engine driven vac pump to operate Many of these things are daisy chained together, with a known pecking order of what gets connected what.... When this system was invented, back up digital instruments were not on the drawing board. Second AIs and altimeters seem to be common... PP ideas. Not an instrument tech... Best regards. -a-
jamesm Posted August 7, 2017 Report Posted August 7, 2017 (edited) Good question not sure how answer it though. I couldn't figure out what fittings are "approved" for the pitot static plumbing. I suppose the pitot static test would tell you if you has too much pressure loss. Stein Air has quick release fittings that are a little smaller than clunky brass fittings are the instruments and the Experiential guys have been using them for a while now. ADDED: just make sure you plug the unused ports with proper fittings. http://www.steinair.com/product-category/pitot-static/?product_count=24 Edited August 10, 2017 by jamesm
carusoam Posted August 7, 2017 Report Posted August 7, 2017 Industrial machinery has been using things like what @jamesm is showing above... light weight and durable and slide in permanent type connections... Make sure your mechanic is on board with its proper use... matching the dimensions and material might be important/ critical to prevent leaks... Best regards, -a-
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