returns to within normal limit(s), 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 is no alarm for the individual EGTs because the temperature values
can assume different ranges depending on the flight configuration (run up,
climb, cruise). There
is
an alarm on the DIF measurement, the difference
between the hottest and coolest EGTs. DIF—or span—is the important
measurement for monitoring the EGTs. See “Factory Set Default Limits”
on page 47 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.
When an alarm is displayed,
holding
the
STEP
button until the word
OFF
appears will disable that alarm indication for the remainder of the
flight. See Alarm Limits” on page 47.
Alarm Priority
If multiple alarms occur simultaneously, the higher priority alarm will
temporarily “hide” the lower priority alarm(s). When an alarm occurs,
note the cause of the alarm and tap the
STEP
button to clear the alarm
indication so that you will be notified of any other alarm that might have
occurred. The alarm priorities are as follows:
Highest priority
TIT
TIT over temperature
CHT
CHT over temperature
OIL
OIL temperature
CLD
CHT cooling rate
DIF
EGT span
BAT
Battery voltage
LO FUEL
Fuel remaining low
Lowest priority
LO TIME
Fuel endurance low
Pre-Ignition and Detonation
Combustion that is too rapid leads to detonation and possibly pre-ignition.
Detonation
is abnormally rapid combustion where the fuel-air mixture
explodes instead of burning uniformly. It causes the EGT to decrease and
the CHT to increase, and can appear during the leaning process. It occurs
under high compression from fuel with too low an octane rating, or from
For Your Safe Flight
Page 29
Summary of Contents for EDM-760 TWIN
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