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Correct lean


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Generally accepted practice is to lean until your begin to lose engine rpm, look at your EGT, and then go rich until your temp is 50 degrees lower than that.



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USAF E-3 Crew Chief 1981-2001

FS2004 Century of Flight, FSX, flying since version 1.0!

A&P Mechanic...still getting my hands dirty on E-3's!...

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Hi Kiri,


Unfamiliar - but is that the TURBINE model ? If so - you don't lean turbines... I didn't think RA released a V2 on the piston ?


If it's the piston model - it should have an EGT Gauge - Exhaust Gas Temperature... You want to start pulling the mixture back - s-l-o-w-l-y - until you find the MAX EGT reading and the gauge starts falling off as you pull it further - this is the Lean Of Peak side (LOP) - and for our purposes - not where you want to run the engine... So start richening the mixture again until you find max - then keep richening it - Rich Of Peak side (ROP) - until you're passed max temp and you're around 100 degrees richer than the max - this should be your best power setting - since we're not paying for gas this should be fine... The actual temps don't matter - just that you're around 100 degrees richer than the max temp displayed - many gauges have a bug to mark the max temp point... Keep in mind you this will need to be modified any time you change altitude...




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Hi: how do I know if fuel lean is set correctly according to altitude ? (flying Beechcraft Duke B60 V2)

Thanks for any help, kiri.


2 methods:

1: The `analyzed` method: Lean until peak TIT, then enrich back to 50 degrees rich of peak. Not 60. Not 40. Exactly 50

2: The `f**k it, I'm simming` method: Lean until peak fuel flow, then richen it a bit


I know of several real pilots, in real aircraft that use method 2... its only fuel money.


There is also Method 3: Lean to 50 degrees past Peak to a 50 degree lean of peak. This method usually demands highly accurate fuel injection and even more accurate measurement of cylinder temps and remains somewhat contentious:


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