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Old December 31st 06, 06:05 AM posted to rec.aviation.piloting,rec.aviation.student
Newps
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Default Engine mixture guidelines



Jose wrote:

The initial lean should be very quick. It's called the "Big Pull."
Fine tune as slow as you need to. You need to avoid the red box,
that's why you lean quickly.



I've only heard of a red fox, not a red box. What is that?




At and below 60% there is no red box, put the mixture anywhere you want.

At 65% power use richer than 100 ROP or leaner than peak.

At 70% power use richer than 125 ROP or leaner than 25 LOP.

At 75% power use richer than 180 ROP or leaner than 40 LOP.

At 80% power use richer than 200 ROP or leaner than 60 LOP.


As you transition from takeoff power to cruise power if you are going to
be LOP make sure you lean rapidly to the values listed for LOP ops.
Fine tune as necessary.