Bill Grabowski Posted January 2, 2011 Report Share Posted January 2, 2011 I decided to make my own checklist to manage the fairly complex Corvalis environment based on the POH supplied with the JGX-Designs Corvalis. Below is the link to the .pdf. https://home.comcast.net/~wsgrabowski/JGX-Designs%20Corvallis%20Checklists.pdfAny suggestions for improvement are welcome.This file may be used freely.Bill Quote Link to comment Share on other sites More sharing options...
LA Posted January 2, 2011 Report Share Posted January 2, 2011 Any suggestions for improvement are welcome.Okay........You night want to add a line about leaning after startup at airport altitudes above 3000' msl. (because of density altitude) This would also include some leaning before takeoff, and not always going full rich for landing. A lot of POH's don't mention this, but you'll find that engine manufactures will, as well as checklist's at high elevation airports. LA Quote Link to comment Share on other sites More sharing options...
Bill Grabowski Posted January 2, 2011 Author Report Share Posted January 2, 2011 LA,I've never seen that on any checklist I've ever used and I did not find that in the POH or on the checklists from the POH, so I have no reference. If you have info from Cessna on this procedure and the reasons, I'll look at it.Bill Quote Link to comment Share on other sites More sharing options...
Lukasz Posted January 2, 2011 Report Share Posted January 2, 2011 Excerpt from X-Plane Corvalis POH, p.45:"Mixture Settings – In cruise flight and cruise climb, care is needed to ensure that engineinstrument indications are maintained within normal operating ranges. After reaching thedesired altitude and engine temperatures stabilize (usually within five minutes), the mixturemust be adjusted. The engine driven fuel pump references deck pressure and adjustsmixture automatically for deck pressure and altitude effects. The pilot is responsible to leanthe mixture in cruise for lower fuel flow."Mixture leaning after startup and before takeoff, is to avoid spark plugs fouling with deposits of byproducts of rich mixture combustion. For takeoff and climb, leave the mixture at full rich and let the altitude-corrected injection do it's job. Corvalis has turbocharged engine, which puts out full power up to 18000ft, so there is no need to lean mixture under that altitude anyway, as engine doesn't get smaller amount of air, as the outside air density drops. So there is no need to restrict fuel inflow to maintain proper fuel to air ratio. Below 18000ft, the mixture lever in Corvalis is only used during cruise, just for increased fuel efficiency in LOP mode (apart from pre-takeoff leaning described above). Only above 18000ft some leaning might be required, depending on circumstances. Quote Link to comment Share on other sites More sharing options...
Bill Grabowski Posted January 2, 2011 Author Report Share Posted January 2, 2011 lis (doesn't anyone have real names anymore) :'(,Thank you for that knowledgeable reply, "Oh Learned One". ;DBill Quote Link to comment Share on other sites More sharing options...
LA Posted January 2, 2011 Report Share Posted January 2, 2011 Yes............the fact that it's turbo-charged, hadn't entered my mind. I havn't yet seen what a checklist say's about leaning after engine startup at high altitude airports. This would of course be at idle speeds. At our airport elevation of 4603' msl., it's quite obvious when we don't lean right after startup (no turbo & carb). I also did see in a Corvalis checklist, that it's important to lean in climb, if the turbo charger isn't maintaining a predetermined value below 18000'. I'd have to look that up again, to check the numbers.LA Quote Link to comment Share on other sites More sharing options...
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