EricB Posted November 16 Report Share Posted November 16 So there have been some limited discussions of problems or issues people have seen but I'd like to see what people are NORMALLY seeing. What readings do you see in normal flight, during taxi and/or runup, etc. Indicate what you think is normal and any issues you may have had so we can all learn. I've attached a screenshot from today's flight showing what I think are very normal cruise indications. I will say my Generator light flickers a lot at anything below 2000 rpm and elsewhere on the forum I saw some suggestions about that. When I got this plane, many of the readings fluctuated radically but we've worked it down to only the generator light being weird. Quote Link to comment Share on other sites More sharing options...
Towner Posted November 16 Report Share Posted November 16 This is mine from earlier this month. Don’t remember the altitude or outside temperature though. I’ve never had any issues with flickering or warning lights. EGTs have always been a little farther off than I like. Quote Link to comment Share on other sites More sharing options...
Roger Lee Posted November 17 Report Share Posted November 17 Both sets of readings are fine. We are looking for a range of numbers and not a single one. each engine and each plane has a slightly different personality so all readings won't be the same, but should be within a certain operating RANGE. Quote Link to comment Share on other sites More sharing options...
shiny.ice Posted November 17 Report Share Posted November 17 Here are some random points from an almost 4 hour cross country. Obviously the 912iS is different, but you can see the overall picture: Quote Link to comment Share on other sites More sharing options...
shiny.ice Posted November 17 Report Share Posted November 17 And here it is, zoomed in to the runup and takeoff. Obviously it's a lot easier with the iS and the Skyview, even if FD won't update their Dynon firmware, sigh. Quote Link to comment Share on other sites More sharing options...
shiny.ice Posted November 17 Report Share Posted November 17 Last one, here's what it looks like when you take the iS into the 98-100% throttle, which goes out of eco mode. It goes open-loop on the ECU and dumps extra fuel in, which is like being "rich of peak", the EGT drops. Note on the throttle/flow graph, black is flow, blue is throttle. Quote Link to comment Share on other sites More sharing options...
Warmi Posted November 17 Report Share Posted November 17 Your volts seem pretty low for this rpm. My regulator just went bad last week after over 600 hours of service . I was seeing intermittent low volts warmings here and there for the last few weeks and then it just died ( ironically during my annual at my mechanics shop - probably the best place for this to happen ) Here is a graph of my volts vs rpm on my flight to his place ( it is steady about 13.7 volts for the whole cruise but it was dipping during run-up and then during landing on idle) The second one is when my mechanic was running the engine on the ground - it briefly went to 13.5 or so volts and then went downhill and never recovered regardless of the rpm. Quote Link to comment Share on other sites More sharing options...
Tom Baker Posted November 17 Report Share Posted November 17 22 hours ago, EricB said: So there have been some limited discussions of problems or issues people have seen but I'd like to see what people are NORMALLY seeing. What readings do you see in normal flight, during taxi and/or runup, etc. Indicate what you think is normal and any issues you may have had so we can all learn. I've attached a screenshot from today's flight showing what I think are very normal cruise indications. I will say my Generator light flickers a lot at anything below 2000 rpm and elsewhere on the forum I saw some suggestions about that. When I got this plane, many of the readings fluctuated radically but we've worked it down to only the generator light being weird. I have seen more than once when the blinking generator light was a predecessor to a voltage regulator failure. Quote Link to comment Share on other sites More sharing options...
Roger Lee Posted November 17 Report Share Posted November 17 It can also be a lose wire up to it or a lose battery terminal. The light goes out when it gets 12V+ through it. Quote Link to comment Share on other sites More sharing options...
airhound Posted November 19 Report Share Posted November 19 Happy Thanks Giving all. Tried other Flier posts without response . Forgive me for throwing in a topic here. Problem: I’ve been told by IC techs and others that the whine (intensity is directly related to power changes) in my phones is an RFI related/Ground loop thingy. Every grounding point has been cleaned and tightened, head phone jacks have isolators in place. No change. Haven’t looked to see if mfg shielding is touching anything near connecting points in the mike jack or the wiring condition of the optional limo jacks. Anyone out there eliminated this demon please share. Eternally Thankful, Doug Quote Link to comment Share on other sites More sharing options...
EricB Posted November 20 Author Report Share Posted November 20 First - RFI and ground loop are very different things. Ignore anyone who doesn't know the difference. All alternators put out RF interference; its the nature of the beast. But, that RF should not be transferred to the DC circuits that power our radios and audio gear. You failed to mention just what the issue was. If the RF is coming down the DC line, it might be that the capacitor that's supposed to "smooth out" the voltage post being coverted to DC is not doing its job. In that case it is either the capacitor itself, or insufficient grounding of the minus side of the cap. If the RF is being "picked up" by other wiring then shielding or grounding of those leads is the issue. There is a ground buss on the firewall of the CTLS where several items are grounded. You should check that all those connections are tight, not corroded, and done with sufficiently large wire that the wire itself does not offer a resistance to ground. Anything that seems to be "grounded" with a very light gauge wire should have that wire replaced. Also note that ground wires should be "home run" to the ground buss and not daisy chained through another "possible" ground point. If the shielding is "touching something" that would not cause an issue as the shield wire had better be grounded or it isn't really a shield wire. I have no idea what a "limo jack" is. That's not a standard engineering term. Quote Link to comment Share on other sites More sharing options...
EricB Posted November 20 Author Report Share Posted November 20 Just for completeness, a "ground loop" happens when a circuit is grounded at more than one point but those 2 points do no agree on what is ground. That is, a voltage exists between the assumed ground points. In most audio circuits this results in a hum since we supply 60 Hz AC to our gear in the USA. Quote Link to comment Share on other sites More sharing options...
Anticept Posted November 21 Report Share Posted November 21 Limo jacks refer to the bose 6 pin jack. Quote Link to comment Share on other sites More sharing options...
shiny.ice Posted November 22 Report Share Posted November 22 22 hours ago, Anticept said: Limo jacks refer to the bose 6 pin jack. Limo, aka LEMO, jack, named after the manufacturer: https://www.lemo.com/int_en/solutions/originals/b-indoor-keyed.html Quote Link to comment Share on other sites More sharing options...
Anticept Posted November 22 Report Share Posted November 22 Here's the part numbers specifically: https://aviation.stackexchange.com/a/50447 There are premade sockets and harnesses available from aircraft spruce for these bose connectors as well, you have to search for them. Quote Link to comment Share on other sites More sharing options...
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