J.P. Instruments EDM 900 Pilots Guide - Manual (Page 27)

For Your Safe Flight Page 27
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
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’
3 Wait one minute Let engine stabilize.
4 Tap the LF button LOP Start LeanFind (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
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.