J.P. Instruments EDM 960 Twin Pilots Guide - Manual (Page 27)

For Your Safe Flight Page 22
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’
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
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.