For Your Safe Flight Page 27
Display Symptom Probable Cause Recommended
Action
(no picture)
Loss of peak
EGT
Poor ignition or
vapor in fuel
injection system.
Have magneto
tested.
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Decrease in
peak or flat
EGT response
to leaning
process
Detonation. Usually
the result of 80
Octane fuel in 100
Octane engine.
Enrich mixture,
reduce power and
relean mixture.
Repeat to find
power setting
where normal peak
is obtained or run
rich.
Below 10,000
ft. full throttle
causes EGTs
to rise
Weak or defective
mechanical fuel
pump.
Apply booster
pump. If EGTs
drop, replace fuel
pump.
CHT more
than 500°,
EGT normal.
Adjacent EGT
may be low
Leaking exhaust
gasket blowing on
CHT probe.
Look for white
powder around
cylinder to
determine leak
area.
Alarms
The EDM has programmable alarms. When a parameter falls outside of
its normal limits, the digital display will flash with the value and
abbreviation of the alarming item. If the condition triggering the alarm
returns to within normal limits, the display will stop flashing the alarm. If
your installation includes a separate panel mounted alarm warning
enunciator light or audible warning, it too will be activated.
There are no alarms for the individual EGTs because the temperature
values can assume different ranges depending on the flight
configuration—run up, climb, cruise. However there is an alarm on the
DIF parameter, the difference between the hottest and coolest EGTs.
DIF—or span—is the important parameter for monitoring the EGTs. See
“Factory Set Default Limits” on page 44 for a list of the alarms and their
factory default settings.
When an alarm is displayed, tapping the STEP button will temporarily
disable the alarm indication for the next ten minutes.
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