I have a habit of doing an in-flight, high power mag check just before let-down on almost every flight.  It is the best way to find weak plugs and ignition issues long before they would surface on a run-up mag test.  iI have a bushel basket of plugs that fail the inflight test but will pass a run-up mag check or a mechanic's bomb test.  This finds weak plugs as much as 35-40 hours before they would fail and be a flight-stopper.  It also lets you deal with the problem at home, at your leisure instead of somewhere else.

Walter


On Aug 24, 2011, at 12:36 PM, John Hafen wrote:

Gents:

Is an in-flight magneto check generally recommended?  

Thanks,

John Hafen
IVP 413AJ, 330 hours, and I've NEVER touched the key while flying......


On Aug 23, 2011, at 9:51 AM, paul miller wrote:

470 hours SNEW on mags and plugs.  I did get #5 & #1 going offscale last trip but that is normally corrected by tightening the connectors on that side of the engine.  The EGT wires use a friction connector.  So, the inflight mag check is the best initial diagnostic?  Thanks for the idea,

Paul
Legacy, Calgary

On 2011-08-23, at 6:01 AM, Walter Atkinson wrote:

> How many hours on the mags?
>
> Plugs?
>
> Sounds like a mag....
>
> Walter
>
>
>
> On Aug 22, 2011, at 5:18 PM, paul miller wrote:
>
> Follow-up.  EGTs bouncing all over....

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