Aerobatic-List Digest Archive

Wed 08/31/16


Total Messages Posted: 1



Today's Message Index:
----------------------
 
     1. 12:52 AM - excessive loss of oil during aerobatics (Markus Feyerabend)
 
 
 


Message 1


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    Time: 12:52:05 AM PST US
    From: "Markus Feyerabend" <feyerabm@web.de>
    Subject: excessive loss of oil during aerobatics
    Hello all, Last weekend I noticed an excessive loss of oil during aerobatics in our Extra (AEIO-580). Up to now we where using about 0.5-1 quart per hour of aerobatics, but last weekend that raise to around 4 quarts per hour (5 displays of around 15min each at an airshow). There is no visible (read "more then usual") oil coming from the cowling/firewall and I believe that if the engine oil would be burned by the engine (broken oil rings, bad valve guide or so) that there would be a noticable smoke trail coming from the exhaust with that amoutn of oil being lost!? However, in one short video sequence I saw that after a negative push to the vertical there was quite a trail of oil coming from the engine breather hose, which I havent noticed in previous flights (at least not as intense as in that clip). Im now suspecting the shuttle valve/air-oil separator... Any hints, tips, tricks or suggestions? Should I just remove both the shuttle valve and air-oil separator and clean/flush it with mineral spirits/petroleum? Anything else to be aware of? Thanks and best regards, Markus




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