....Yes! This actually happened to me on a rental aircraft. I saw oil coming out of the cowl after departure and returned to the FBO. The said the aircraft had just been serviced, so they called in the mechanic and after inspection he remembered the telephone had distracted him while installing the filter and he failed to tighten or wire it. This is the only case I have even become aware of. I would not worry in the least about a properly installed filter ever coming off and don't believe they need tie wire at all. To me, the only reason to tie wire most things is to insure they will stay put, in the event that one forgets to tighten or properly install the part in question. In all our years of racing virtually everything that has an engine, we have yet to see an oil filter come loose. In fact the opposite usually occurs, as they become more stuck and difficult to remove. We have seen the non racing automotive type filters rupture with extreme pressures as an oil relief valve sticking etc. The K&N racing filters will take 300 plus PSI as we have tested them. Any properly installed and torqued to specification filter will not blow out its seal as it is captured and will easily take the 300 PSI we tested with (the case will split first). Thanks, Allan