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For Your Safe Flight
Page | 23
Rich of Peak
leaning is as simple as:
A. Pre-lean your mixture.
B. Tap the
LF
button (verify
ROP
appears).
C. Lean mixture until
LEANEST
flashes
(
peak found).
D.
Enrichen to the desired value ‘Rich Of Peak’.
R
Procedure
Scanner Example
(one engine)
Comments
1 Establish cruise at
65 to 75% power.
2 Pre-lean the
mixture to 50°F
estimated rich of
peak on any EGT:
_________°F.
EGT
1490
CHT
370
* See
‘Pre-leaning’ page 23.
3 Wait one minute
Let engine stabilize.
4 Tap the LF button
ROP
Start Lean Find (if
LOP
appears hold STEP & LF
until
ROP appears
)
5 Lean the mixture at
approx. 10°/second
without
pausing.
EGT
1520
FF
13.8
Flashing cylinder I.D. box
identifies that EGT
increased at least 15°F.
EDM is now looking for first
EGT to peak.
6 Stop leaning when
a column begins
flashing. You will
see
LEANEST
for
one second,
followed by:
EGT
1545
FF
12.4
Flashing cylinder I.D. box
AND
its column indicates
leanest cylinder. Due to
thermal inertia this will
usually be about -15°F
down the lean side of peak.
7 If you hold PEAK,
the values of EGT
and FF when peak
was found are
displayed.
EGT
↑
1560
FF
12.9
Captured peak EGT value
and peak FF are displayed.