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The partner on my airplane was flying home from a short cross country when he noticed the oil pressure drop below 25PSI. He immediately cut power to idle and made best glide for the nearest airport. He did a great job and made the airport within 14 mins. He never powered back up and cut the engine immediately once he made the turn off the runway. At that point oil pressure was steady at 18psi. He reports that was the lowest the oil pressure went and it was steady in the descent at around 20. All temps remained in the green and totally normal. 

Once on the ground it was clear there was a large oil leak because the belly was coated in oil and oil was pooled in the lower cowling. By the time I got to the airport about 70 minutes later there were droplets kind of raining onto the asphalt from the belly of the plane. We cleaned things up underneath but weren't able to take the cowlings off to inspect. 

The 914 currently has about 150hrs on a 2020 airframe. About one hundred hours of that total has occurred under our ownership in the last five months.  

I'm going to try and get to the airport today and get the cowlings off. What should I expect here? Anything specific I should be looking for? While the airport he landed at is a fairly large muni, it mainly tailors to Cessna flight training and corporate jets. I don't believe there are any Rotax certified mechanics on field. 

  • Re: Loss of Oil Pressure During Flight on 914

    by » 2 weeks ago


    Hi Chris

    I all depends on your RPM....if he was low the oil pump cant supply the engine and turbo at the same rate in low RPM operation.  This may not be an issue if you are not above 3500 RPM.  

    Cheers

    41168_2_914 oil pressure op limits.jpg (You do not have access to download this file.)

  • Re: Loss of Oil Pressure During Flight on 914

    by » 2 weeks ago


    Engine was idled so probably around 2100RPM. 


  • Re: Loss of Oil Pressure During Flight on 914

    by » 2 weeks ago


    Chris...

    As long as the engine still had oil pressure then you should be fine.  Find and fix whatever caused the leak.  Then carry out a few good ground runs and see how your pressure is compared to the specs.  

    Cheers


  • Re: Loss of Oil Pressure During Flight on 914

    by » 2 weeks ago


    Went to the plane today and took off the cowlings. Figured out where the leak is. The oil return line going back into the oil tank split. It appears that it melted against the exhaust manifold. Also ran the logs from the Dynon. Time from the first indication of oil pressure drop to shutdown was 12mins. The lowest observed oil pressure was 8psi but only for a few 10ths of a second immediately after pulling back to idle (1820RPM). After that pressure held pretty consistently between 17 and 20psi. No spike in oil temp or any other temps at all. 

     

     


  • Re: Loss of Oil Pressure During Flight on 914

    by » 2 weeks ago


    Hi Chris,

    It is not possible to rout all hoses sufficiently far away from the exhaust system to be absolutely sure of not getting convection/radiant exhaust system heat damage.

    For the few locations where I feel there is the potential for heat damage to a hose, I have home made protective shields, out of builders soft aluminium flashing, plus automotive exhaust wrap, HT siliconed to the underside. I use this shielding in a targeted way ie not the whole hose and secure it with double wrapped safety wire. Seems to do the job.  😈


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