FAA Approved Installation Manual for the
Report No 908
EDM-900 and EDM-930
Page 52 of 55 Rev I
Primary Engine Data Management System
Date 10-9-2012
1- Introduction:
The EDM-900/930 is a combined electronic indicating system which simultaneously displays to the pilot powerplant
and aircraft systems operating parameters. It includes the following indicating systems; replacing all previous
primary digital and/or analog instruments: Message Area Abbreviation for primary and non-primary instruments is
shown on the Right with the function on the left .
2- Description:
Display
Non-primary functions Induction air temperature
(IAT), carburetor inlet temperature (CARB), exhaust
gas temperature (EGT) span (DIFF), bus voltage,
amperage load, Shock Cooling (CLD), Fuel
Remaining (REM), Fuel Required (WP REQ), Fuel
Reserve (WP RES), Nautical Miles per Gallon
(MPG), Estimated Time to Empty and Fuel Used
have programmable alarm limits
.
Engine Cylinder
head Temperature
(
CHT), Exhaust Gas
Temperature (EGT), Fuel Pressure (FP), Fuel Flow
(FF), and Engine Manifold Pressure (MAP) may not
be primary on some installations. Any non-primary
functions are programmable.
The right hand side the EDM-900 has horizontal
tape scales with digital values below each scale and
the EDM-930 right side has vertical scale columns
with a digital value below each column. The
functions are: Oil-Temperature (OT), oil-pressure
(OP), fuel-pressure (FP), CDT for engine
installations having a primary compressor discharge
temperature, Fuel Flow (FF), and two main and two
aux. fuel tank quantities (QTY-LF/RT Main, QTY-
LF/RT Aux). The engine rotational speed (RPM) and
manifold pressure (MAP) are presented in the upper
left corner of the instrument. The EGT, CHT and
turbine inlet temperature (TIT) are presented in the
lower left corner. Below the EGT/CHT columns is a
message center that displays the digital values of
the EGT/CHT/TIT and additional functions like
shock cooling and caution and limit alarm
messages. OAT is displayed in its own box in
degrees C or F. With the EDM-930 having a fixed
display the EDM-900 can rotate 90 degrees to
accommodate installation.
Specific values for each parameter are displayed
digitally above the vertical scale displays of EGT,
CHT, and TIT or TIT-R,-L. The highlighted number
below the columns indicates which cylinder's digital
information is presently displayed as an alarm in the message center or when manually
or automatically stepping through the parameters.
Gauge Function
Message Area
Alarm Abbreviation
Primary
Primary
Engine rotational speed
RPM xxxx
Engine Manifold Pressure
MAP xx.x in hg
Engine Cylinder Head Temp
CHTX xxx
o
F
Engine Oil Temperature
OT xxx
o
F
Engine Oil Pressure
OP xx
o
F
Fuel Pressure
FP xx PSI
Fuel Flow to engine
FF xx.x GPH
Comp. Discharge Temp.
CDT xxx
o
F
Turbine inlet Temp. Left side
TIT-L xxxx
o
F
Turbine Inlet Temp. Right side
TIT-R xxxx
o
F
Single Turbine Inlet Temp.
TIT xxxx
o
F
Non-Primary
Non-Primary
Exhaust Gas Temp.
EGTX xxxx
o
F
EGT Span, highest to lowest EGT (a
calculated number)
DIFF xxx
o
F
Induction Air Temperature
IAT xxx
o
F
Carburetor Air Temperature
CARB xxx
o
F
Shock Cooling of CHT
CLD xx
o
/MIN
Differential Temp. of EGT
DIF xx
o
F
Bus Voltage
Volts xx.x
Amperage Load
AMPS xx
Outside Air Temp.
OAT xx
o
F, oC
Estimated Time to Empty
Est. T to E xx:xx H:M
Fuel used to date
USED xx.x GAL
Estimated Remaining fuel
Est. REM xx GAL
Estimated Fuel required to Waypoint
Est. WP REQ xx GAL
Estimated Fuel Remaining at
Waypoint
Est. WP RES xx GAL
Nautical Miles per Gallon
ECON xx.x MPG
Brightness, Dim control
DIM/BRT
