User guide

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EGT/CHT Display Modes
The Exhaust Gas Temperatures (EGT) and Cylinder Head Temperatures (CHT) for every cylinder are
continuously displayed in both analog and digital formats on the AF-3400/3500. The cylinders are laid out
sequentially with cylinder #1 on the left followed by cylinder #2 to its right and so on. The graph uses small
white bars for the CHT that are superimposed onto the larger EGT bars. The graph uses a dual scale that
represents the CHT scale on the left side and the EGT scale on the right. The digital reading for each
column is displayed above each bar for CHT and below for EGT. During normal operation the EGT and CHT
bars will align themselves in a very easy to recognize pattern.
Leaning EGT Mode (Peak Detect)
The leaning peak detection mode is selected from the main screen by pressing the [ENGINE] -> [EGT/CHT]
-> [PK DET OFF] buttons. As you lean the engine, the EGT bars for all cylinders will rise. As each cylinder
reaches peak EGT, a tattletale marker will appear at the top of that cylinder’s bar. The current EGT is shown
on the bottom of the bar, Peak EGT is displayed on the top and the degrees rich or lean of peak are
displayed on the bar. If you start to richen the engine before all cylinders have peaked the unit will detect the
EGT drop and display a false peak. The peak detection can be reset at any time by pressing the [PK DET
ON] then [PK DET OFF] button.
Warning: You should never lean your engine with power settings over the factory
recommended level (generally 65% to 75% power).
Leaning with high power settings can cause detonation. Always verify your power level with engine charts
before leaning. As you lean past maximum horsepower (100F to 150F rich of peak EGT) your engine will
lose power.
Flight Times
Flight times are displayed on the top of the maintenance check list page. Press the [CHECK] button followed
by the [MAINT] button.
Tach Time: Hours on engine above 1250 RPM.
Hobbs Time: Hours on engine above 0 RPM.
Last Flight: Hobbs time for the last flight.
Today: Hobbs time since 12:00 AM today.
Check Lists
To view your checklists pages press the [CHECK]
button from the main screen. Use the [NEXT] and
[PREV] buttons to scroll through the checklists. To
return to the main screen press the [RETURN]
button.