J.P. Instruments EDM 960 Twin Pilots Guide - Manual (Page 9)

For Your Safe Flight Page 4
Scanner® Display Basics
The EDM Scanner section is located in the lower left area of the screen.
It consists of a graphical display of EGT and CHT (and TIT if so
equipped) and a digital display that automatically scans the various
parameters. You can select Manual Mode by tapping
STEP to lock onto
the parameter of interest. To return to Automatic scan mode, tap LF
followed by tapping STEP .
LeanFind Basics
Simply pre-lean, tap the LF
button (Lean Find) and begin
leaning. The EDM will assist
you in finding the first
cylinder to peak. This
example is for Rich of Peak.
See page 19 for a more detailed description of leaning.
1. Establish cruise at approximately 65 to 75% power and pre-lean the
mixture to 50°F estimated rich of peak EGT on any cylinder.
2. Wait about 30 seconds, then tap the LF button.
3. Begin leaning the mixture smoothly without stopping. Turn a vernier
about ¼ turn per second; retract a non-vernier or quadrant lever so
that EGT rises about 10°F per second.
4. Stop leaning when you see LEANEST for two seconds, followed
by—for example— EGT 1520 FF 13.8. The EGT number is the current
temperature of the first EGT to peak and the FF number is the
current fuel flow.
5. Now tap the PEAK button to display the EGT difference from peak
which is very useful for setting desired degrees below peak.
6. Slowly enrich the mixture noting that the EGT difference diminishes
as EGT climbs back to peak, followed by it going minus again. Stop
enriching at the desired EGT difference (such as ‘
EGT -75’).
7. You can also see what the peak EGT was by holding the PEAK
button.
8. Tap STEP to exit the Lean Find Mode.