J.P. Instruments EDM-960

For Your Safe Flight Page | 25
Lean of Peak leaning is as simple as:
A. Pre-lean your mixture.
B. Tap the LF button (verify LOP appears).
C. Lean mixture until RICHEST flashes (peak found).
D. Enrichen to the desired value ‘Lean Of Peak’.
L
Procedure
Scanner Example
(one engine)
Comments
1
Establish cruise
between 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
LOP
Start Lean Find (if ROP
appears, hold STEP & LF
until LOP appears)
5
Lean the mixture at
approx. 10°/second
without pausing.
(cylinder I.D. box
flashes when a EGT
rises 15°F)
EGT 1520
FF 13.8
Flashing cylinder I.D. box
identifies the hottest EGT
and that an EGT has
increased at least 15°F
which arms the EDM to
now look for first EGT to
peak.
6
After the first EGT
peaks, you will see
LEANEST for one
second and bars
coming from the top
down. Continue
leaning.
EGT∆ -17
FF 12.4
When bars come from the
top down, the cylinder I.D.
box identifies the first EGT
that peaked (leanest).
Continue leaning.
7
When RICHEST
appears, fine tune the
delta EGT to the
desired degrees
below ‘Peak’ (Lean of
peak).
EGT∆ -45
FF 11.6
Lean of
Peak
target
leaner
richer
‘FF’
EGT
0
-40-80
Peak
8
If you hold PEAK, the
peak EGT recorded
will be displayed
along with FF spread.
EGT↑ 1560
FF∆ 0.6
Captured peak EGT value
and the FF spread
between richest and
leanest cylinders.