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  • For Your Safe Flight Page 1

    Pilots GuideEngine Data Management


    Copyright 2011 J.P. Instruments, Inc.All Rights Reserved

    J.P. INSTRUMENTS INC.Information: P. O. Box 7033Huntington Beach, CA 92646

    Factory: 3185 B AirwayCosta Mesa, CA 92626

    (714) 557-5434 Fax (714) 557-9840


    Printed in the United States of America Rev ALast printed

  • Page 2 Engine Data Management

    Table of Contents

    Section-1 Getting Started 4View Angle 4Rotation 6Fuel Flow Computer Basics (independent of fuel quantity) 6Display Screen Basics 7Horizontal Display Mode 7Vertical Display Mode 8Remote Annunciate Light Basics 8RPM and MAP Display Basics 9Linear Bar Graph Display Basics 9Scanner Information Area 10LeanFind Basics 11

    Section 2 - Interpreting Data 12Operation for each Phase of Flight 12Typical Normal Measurements 14

    Section 3 - Displays and Controls 17Control Buttons 17Scanner Displays 19Additional Displays Hobbs, Revisions, and Alarm Limits 21Dimming the Display 22

    Section 4 - Operating Modes 22Automatic Mode 22Manual Mode 23

    Section 5 - LeanFind 24LeanFind ProcedureGeneral Explanation 28Expanded Leaning Procedures 31Common Misapplications 32

    Section 6 - Fuel Flow Operation 33Fuel Management 33Start Up Fuel 34Resetting USD 35Trip Mode (Accumulate Trip Totalizer) 35Scanner Fuel Flow Display Select 35

    Section 7 - Alarms 36Section 8 - Memory and Data Download 37

    Downloading Data from the EDM 37Transferring data from the USB Flash Drive to a PC 38

    Section 9 - First Time Setup and Customization 38Section 10 - Adjusting Manifold Pressure & %HP 41

    Adjusting the HP Constant for Rich of Peak Operation 41Adjusting the MAP 41Adjusting the HP Value 42

    Section 11 - Programming the Fuel Flow 42

  • For Your Safe Flight Page 3

    Fuel Flow K factor 43Programming Trip Mode 45Setting the GPS Com Format 45Troubleshooting the EDM 47Diagnostic Testing on Startup and During Flight 47Diagnostic Messages 47

    Section 12 - Appendices 48Shock Cooling (CLD) 48List of ALL messages in EDM-900 49Navigation Data Formats 50Navigation Data Ports for GPS Comm 50Interface connections to selected GPS models 50

    Section 13 - Technical Support 51

  • Page 4 Engine Data Management

    Section-1 Getting Started

    This is a summary of basic operation. Detailed descriptions of alloperations appear later in this Pilots Guide.

    EDM-900 primary instrument has preset alarm limits andcautionary ranges per the POH (user cannot change them)typically for the following measurements of: oil temperature, oilpressure, fuel pressure, fuel quantity, cylinder head temperature,turbine inlet temperature, manifold pressure, and RPM.

    Note: Fuel quantity gauges must be calibrated to the aircraft andwill not be functional until the fuel calibration process has beenperformed.

    View AngleThe best view angle for the pilot is in the horizontal mode with thebuttons on the bottom. The best Portrait mode is with the buttonson the right.

    View angles are per the table below:

    Horizontal Left 65 Degrees

    Viewing Right 65 Degrees

    angle Vertical Left 60 Degrees

    Right 50 Degrees

  • For Your Safe Flight Page 5

    List of abbreviations and acronyms

    Gauge Function Message AreaAlarm AbbreviationPrimary Primary

    Engine rotational speed RPM xxxx

    Engine Manifold Pressure MAP xx.x in hg

    Engine Cylinder Head Temp CHT2 xxx oF

    Engine Oil Temperature O-T xxx oF

    Engine Oil Pressure O-P xxx oF

    Fuel Pressure F-P xx PSI

    Fuel Flow to engine F-F xx.x GPH

    Comp. Discharge Temp. CDT xxx oF

    Turbine inlet Temp. Left side TIT-L xxxx oF

    Turbine Inlet Temp. Right side TIT-R xxxx oF

    Single Turbine Inlet Temp. TIT xxxx oF

    Non-Primary Non-Primary

    Exhaust Gas Temp. EGT2 xxxx oF

    Shock Cooling of CHT CLD xx o/MIN

    Differential Temp. of EGT DIF xx oF

    Bus Voltage Volts xx.x

    Amperage Load AMPS xx

    Outside Air Temp. OAT xx oF

    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 atWaypoint Est. WP RES xx GAL

    Nautical Miles per Gallon ECON xx.x MPG

    Brightness, Dim control DIM/BRT

  • Page 6 Engine Data Management


    Holding the step button in for 5 seconds, with the engine OFF, willproduce the gray arrow. This arrow can be rotated to a new up positionby tapping the LF button and then the STEP button. If for some reasonyou chose the one bad angle (Landscape looking up from thebuttons), return the instrument to JPI and JPI will rotate thescreen.

    Fuel Flow Computer Basics (independent of fuel quantity)The fuel flow computer tracks the fuel flowing to the engine andcomputes various values based on this. At installation, then each timeyou refuel the aircraft, you must inform the EDM about how muchuseable fuel is onboard. This is done via the REFUEL function.See page 33 for detailed informationControl Button Basics

    Four operating buttons control all functions of the EDM. These buttonschange labels depending on the current state of the EDM.

  • For Your Safe Flight Page 7

    Display Screen BasicsThe display screen is arranged into three sections. The top left is theMAP and RPM section. The bottom left is the Scanner section ormessage area. On the right side are the horizontal primary strip gauges.Non-Primary gauges have a digital read out only. The instrument rangesand alarm limits are configured to match those of your aircraft POH whenthe EDM is set up as a Primary instrument. TIT column is to the rightof the last EGT/CHT when applicable.

    Horizontal Display Mode

  • Page 8 Engine Data Management

    Vertical Display Mode

    Remote Annunciate Light BasicsThe Remote Annunciator Light RALprovides notification that an alarm is presentin the display, for all Primary gauges. Uponpower up, the RAL shows Red and yellowindicating it is functional. Before each flight,confirm that it is functional. Non-functioningRAL must be repaired before flight.

    RemoteAnnunciator Light(RAL)

  • For Your Safe Flight Page 9

    Horizontal mode Vertical mode

    RPM and MAP Display BasicsIn the vertical mode to the right and theHorizontal mode above MAP (Manifold Pressure)and RPM (Revolutions per Minute) are shown.Operations exceeding red line cause the digitalvalue to turn red or yellow with the RAL comingon and a digital value in the Scanner messagearea.

    Linear Bar Graph Display BasicsThe Bar Graphs section contains dedicated bar graphs with digitaldisplay. An example is shown here. Pointers move horizontal left to rightshowing value changes and digital readouts turn redwhen primary exceedances occur. Non primaryfunctions flash white.

    Horizontal mode Vertical mode

  • Page 10 Engine Data Management

    Scanner Information AreaThe Scanner Information Area provides expanded information in the form ofalpha-numeric messages, parameters and calculations. In Auto-Scan,parameters will scan by once every 4 seconds (default). This rate can bechanged in Pilot Programming Mode. Tap the STEP button for Manual selectionof any parameter. Parameters for the installed options will be displayed. To startthe automatic scan tap LF and then STEP.


    EGT 1436 CHT 382 EGT/CHT Shows successive pairs of EGT &CHT per STEP tap.TIT 1580 oF TIT Single Turbine Inlet Temp.

    TIT-L and -R 1490oF TIT-L, TIT -R

    Two Turbine Inlet Temp. Left andRight engine side

    Oil-T 204 oF OIL TEMP Oil temperature in degrees FOil-P 64 PSI OIL PRES Oil pressure in psiF-P16 PSI FUEL PRES. Fuel pressure in psi

    F-F 2.7GPH FUEL FLOW Fuel flow in GPH

    CLD 75 oF SHOCKCOOL CHT cooling rate (deg/min)

    VOLTS 13.9 BATTERY Battery/Bus voltageAMPS -6 Amperage Set up per the specific aircaraftOAT 23 oF OAT Outside air temperature F or CDIF 40 oF DIF Hottest minus coldest EGT

    CRB 56 oF CRB Carburetor Air Temp (only allowed ifIAT not present)

    CDT 145 oF CDT Compressor Discharge Temp (onlyallowed if CRB not present)IAT 105 oF IAT Induction Air Temp


    Calculated fuel remaining on boardbased on what the pilot put in asmaximum.


    Calculated fuel required to reachwaypoint or destination (GPSinterface must be corrected)

    Est. WP REM 63 GAL FUELRESERVECalculated fuel reserve at waypoint(GPS interface must be correct)

    ECON 9.8 MPGNautical


    Calculated fuel miles per units(GPS interface required)

    EST. T to E 04:32H:M

    EstimatedTime toEmpty

    Calculated time remaining to fuelexhaustion in Hours and Minutes atpresent power.

    GPH 15.0 GPH FUEL FLOWRATEActual fuel flow rate in Gallons perhour

    USD 7.2 GAL FUEL USED Actual fuel used by the engine

    FUEL-P 64 PSI FUEL PRES Fuel pressure in PSI

  • For Your Safe Flight Page 11

    LeanFind BasicsSimply pre-lean, tap the LF button(Lean Find) and begin leaning. TheEDM will assist you in finding the firstcylinder to peak. This example is forRich of Peak, ROP. See page 24 fora more detailed description ofleaning. Press LOP to exit the ROPmode and enter the LOP mode.

    1. Establish cruise at approximately 65 to 75% power and pre-lean themixture to 50F estimated rich of peak EGT on any cylinder.

    2. Wait about 30 seconds, then tap the LF button.3. Begin leaning the mixture smoothly without stopping. Turn a vernier

    about turn per second; retract a non-vernier or quadrant lever sothat EGT rises about 10F per second.

    4. Stop le