For Your Safe Flight Page 11
Section 3 - Operating Procedures
Diagnostic Testing on Startup and During Flight
When your EDM is first turned on, all digits light up for a few seconds,
permitting you to check for non-functional segments. Then each column
is self-tested in sequence while the EDM tests internal components,
calibration and integrity of the probes. If a problem is found, it will be
displayed as OPEN PRB or CAL ERR, followed by the name of the
probe or channel.
Display Channel Display Channel Display Channel
EGT I
EGT #1
CHT I
CHT #1
OIL
Oil
EGT 2
EGT #2
CHT 2
CHT #2
TIT I
TIT #1
EGT 3
EGT #3
CHT 3
CHT #3
TIT2
TIT #2
EGT 4
EGT #4
CHT 4
CHT #4
CDT CRB
CDT carb
EGT 5
EGT #5
CHT 5
CHT #5
IND
IAT
EGT 6
EGT #6
CHT 6
CHT #6
OAT
OAT
During flight, probes are constantly checked for inconsistent or
intermittent signals. A faulty channel or probe encountered during start-
up or during flight will be deleted from the sequence, producing a
missing column or blank digital data.
Modes
The EDM has three different operating modes: Automatic, Manual and
LeanFind. When you first turn on the power the EDM starts in the
Manual mode, but will enter the Automatic mode after a few minutes.
The Automatic mode provides you with engine monitoring information
for the majority of flight conditions. To adjust the mixture, use the
LeanFind mode. And to display specific parameters, use the Manual
mode. In both the Automatic and Manual modes the analog display
shows a bar graph of EGT and CHT for each cylinder and the TIT and
Oil temperature.
Automatic Mode
Just tap the LF button, then tap the STEP button. No user
intervention is required to use this mode. In the Automatic mode the
EDM displays the parameter sequence at a user-selected rate (see
“Personalizing” on page 36).
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