Mag Check Failure

Upon Mag Check, the Right Mag dropped 300 RPM with a terrible low growning noise. I had been told not to try and burn off fouled spark plugs in a Cirrus, although I have heard from others that they have done it. Has anyone seen a large drop like this AND had a burn off work?

In reply to:


Upon Mag Check, the Right Mag dropped 300 RPM with a terrible low growning noise. I had been told not to try and burn off fouled spark plugs in a Cirrus, although I have heard from others that they have done it. Has anyone seen a large drop like this AND had a burn off work?


You might try moving this post to the members section; you’ll get more responses.

If you think your mags are starting to go, then have them checked immediately.

As for running the engine hard during ground ops to burn excess oil on the plugs, I personally wouldn’t. I would try and find the bad plug(s), remove and clean them.

In reply to:


Upon Mag Check, the Right Mag dropped 300 RPM with a terrible low growning noise. I had been told not to try and burn off fouled spark plugs in a Cirrus, although I have heard from others that they have done it. Has anyone seen a large drop like this AND had a burn off work?


Assuming you have Emax on board, do another mag check while on the engine page. Run the engine up to 1700 RPM turn to the left mag and see if each EGT rises (how much is not important just a rise) then do the same on the right mag (no need to switch to both in between just switch to the right and see if the rise in EGTs continues)
If any of them fall then most likely those plugs need to be replaced.

There is a lot of old discussion on this in the members section if you search on mag and mag checks

Good luck

Mason

I recall from a few years back a thread on this site that talked about average cockpit background noise levels (in decibels), amount of difference between front and back seats, and the fact that high decibels could be damaging to the ears of very young children and babies.

Does anyone recall what the exact decibel levels were that were discussed in that post…AND does anyone know if high decibel levels could be dangerous to an unborn child, what month of pregnancy the risk might begin, etc? I know this is a slightly odd post for this site…but it is the only place I recall seeing a serious discussion on this topic. Thanks in advance

In reply to:


Upon Mag Check, the Right Mag dropped 300 RPM with a terrible low growning noise. I had been told not to try and burn off fouled spark plugs in a Cirrus, although I have heard from others that they have done it. Has anyone seen a large drop like this AND had a burn off work?


When our 22’s have sat in the hanger for a while they have had big mag drops. We burn them off on runup and all is well. We think of our 22’s as pets, they are mad when they do not get played with. If we fly them once a week we have no problems with mag drop…Ed

Thanks, for some reason, I can not post on the members site, although I am a member. Thanks for your vote on the no burn off of mags.

Georgia, From time to time I fail a ground mag check by haveing a “rough” engine on the right bank…this usually always happens when I forget to lean (agressively) during extensive ground taxi opns … when this happens, I return back to “both” and increase RPM’s to 2000 for 30 seconds with a lean mixture setting… I watch Emax to insure I have good numbers with each cylinder on EGT and CHT … After this 30 seconds, I return to 1700 and do another mag check …it has never failed to be “smooth” with this second check …I have discussed this modus operandi with several technicians and have been told this is not hurting the engine …I have inspected (and tested) the plugs related to the right bank and all test out OK … I use “thin wire” plugs…I am currenlty rebuilding the mags due to the 500 hour requirement … will be anxious to see if all is smooth when then the new “rebuilt” mags are in place next week…regards, ben