J.P. Instruments EDM 960 Twin Pilots Guide - Manual (Page 26)

For Your Safe Flight Page 21
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’
3 Wait one minute Let engine stabilize.
4 Tap the LF button ROP Start LeanFind (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.
8 If you tap PEAK, the
difference from peak
EGT is shown. Tap
again to return to the
peaked EGT value.
EGT
∆ -90
FF
13.4
A useful mode for setting
mixture the desired degrees
rich of peak - no math
required! NOTE: Unit
remembers view last used.
9 Slowly enrich the
mixture noting that
EGT is returning to
peak. Stop enriching
at the desired EGT.
‘Peak’: best Econ.
‘ROP’ target: best
power.
EGT
1560
FF
12.9
EGT
1460
FF
13.6
(100º RICH OF PEAK)
Rich of Peak target
leaner richer ‘FF’
EGT
1560
Peak
-100
1460