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Date: Wed, 30 Sep 1998 07:58:57 -0500
From: Snowbird <snbird@ibm.net>
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Subject: Re: Sacred Art of Mixture Control (Re: Sudent using KATANA?)
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HLAviation wrote:
> 
> >Many (including my mechanic) would say, *leaning
> >during taxi* is a pretty bad practice.  Clearly, the damage caused
> >by one failure to enrichen prior to takeoff can be much more serious
> >(and expensive) than some plug fouling.  For this reason, I don't
> >know of a single FBO in my area which encourages leaning on the
> >ground.
 
> Day one (I was still renting at an FBO) I was taught to lean for taxi > There is a line on every pre takeoff checklist I have ever seen that 
> says "Mixture-Full Rich" so unless your instructor has also faile to 
> teach you to use a checklist there shouldn't be a problem taking off
> with the engine leaned. 

Different topic but:
There are a number of accidents involving professional pilots (who
were presumably taught to use checklists) and missed checklist items.  
I guess they shouldn't have happened, but they did.  It's a fact, 
people make mistakes, including mistakes with checklist use.  I
don't think it's good to get too complacent that using a checklist
means "it could never happen to me".  It's a way of lowering the
odds, not a panacea. Just my opinion.

I don't know about your plane, but back on the same topic, the 
point stands that if the plane is equipped with a carburator which 
has a seperate idler circuit, it's apparently debatable whether
adjusting the manual mixture control has much effect on the mixture
when taxiing about at low rpms.

> if the plane has
> that knob or lever it is in your best intrest to use it properly.

Quite so, but like many issues in aviation, there is debate about
the definition of "proper".  I really don't want to take sides
(I lean during taxi myself, but I also idle and taxi at 1000 rpm
for various reasons).  I'm just pointing out that it isn't
a cut-and-dried "this is proper, this isn't" situation.

Snowbird


