When to lean mixture

I love reading these debates. You cannot possibly hurt any piston engine by running too lean at idle or a low power setting. Now, at a higher power setting, absolutely. The reality is that you either want to be rich enough of peak, or lean enough of peak, but nowhere near peak.

Of course, this also really showcases how ridiculous it is that in the year 2010, we're debating how to properly operate 1950's technology. Let Bosch or Siemens design your engine management, and just push the throttle and trust the computer to adjust everything to its ideal point for the conditions present.
 
USMCmech said:
Fixed that for you.
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Well, what I really should have said, is:

1930's technology piston engine with 1950's era mechanical, constant flow fuel injection.

Heck, back in the 1960's Porsche had "modern," mechanical sequential fuel injection (very similar to a mechanical diesel injection system).
 
ppragman said:
Here's the wording of 91.9a


Unless something in the POH indicates that a check of the mags must be done prior to each and every takeoff, I think the NTSB is wrong in their interpretation of 91.9a, but that's just me.
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Yep...although if you don't do it, I'm certain you can be pranged for careless or reckless operation. (actually, you can get pranged for that with just about anything.)

MidlifeFlyer said:
Are you sure? Check out Footnote 7 in this NTSB case (failure to perform a magneto check is a violation of 91.9(a)). The NTSB appears to regard (at least in that case) all of the manual as setting forth operating limitations.
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No, I'm not - I'm just fairly convinced that "limitations" means just that. I'm not a lawyer...but I'm inclined to agree with ppragman quoted above.

While it's a somewhat dated article, I still agree with John Deakin at least partially...at least read with a discerning eye and be open to errors in POH/AFMs.
 
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