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Edm 350 System And How It Works ?

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By Author: Joseph Polizzotto
Total Articles: 48
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The aircraft Engine Data Manager 350 (EDM 350), by J.P. Instruments is a small box-like device with an LCD screen on the front and it keeps track of the vital functions of the aircraft engine.

The faceplate requires just 3.25 square inches of space on your aircraft dashboard and is easily fitted.

Although physically small in size, this little gadget is packed with electronic chips that analyse 24 different engine functions in any 4-cylinder aircraft. The basic 4-cylinder EDM 350 kits start at just $798 while the 6-cylinder EDM 350 kits are priced at $988. Both representing enormous value for money.

Fitting the EDM 350 is as easy as can be – first, attach all the probes to the engine and thread them out of the empty space 3.25-inch space. Next, attach the probes and wires to the EDM 350 and ‘plug-in’ the EDM 350 Aircraft engine data manager into the empty socket. That it, you’re good to go.

How the EDM 350 works:

The EDM 350 is like a little on board computer. It has ‘high‘, ‘low’ and ‘normal’ figures for 24 different engine parameters pertaining to 2 ~ 4 cylinder aircraft engines. Once the aircraft engine is switched on, the 24 sensors attached to different parts of the aircraft engine, pickup data and transmit the same via wires to the EDM 350.

As the data begins to flow in, the EDM 350 begins to display the information on the LCD screen. The information may be displayed graphically or in actual numbers depending on how the pilot wishes to view the information.

So long as all parameters are in the ‘normal’ range it simply displays the data. If however, any parameter is in the ‘low’ or ‘high’ range, an audio-visual alarm is triggered. The ‘lows’ and ‘highs’ can be entered manually by the pilot.

With the Electronic Data Management Systems 350 on board, the pilot is free to fly the plane and enjoy the experience rather than having to concentrate constantly the status of the engine.

Here are the 24 different engine parameters that the EDM 350 keeps a watch over:

1. CHT - Cylinder head temp - probes and harness included.
2. EGT - Exhaust gas temp.
3. VDC - Voltage display.
4. ROP/LOP - Lean finder.
5. CLD - Shock cooling on all cylinders.
6. DIFF - Engine health.
7. Internal Memory - Enough memory to record 600 hours of data (recorded every 6 seconds).
8. USB Port - Convenient data port for quick and easy download of engine data.
9. EZTrends Software - Graphics software with Google Earth location included.
10. MAP - Engine Manifold pressure.
11. RPM - Prop rotation speed.
12. O.T. - Engine oil temp.
13. F.P. - Fuel pressure.
14. O.P. - Engine oil pressure.
15. OAT Probe - Outside air temp.
16. CRB Probes - Carburettor temp.
17. TIT Probes - Turbine inlet temp.
18. CDT Probes - Compressor discharge temp.
19. L-R-Main - Fuel quantity in all tanks.
20. AMP - Battery load output in amps.
21. V-2 - Second volts readout.
22. % HP - With FF, OAT and RPM.
23. Amp-2 - Second load readout in Amps.
24. FF - Fuel flow includes:
• GPH - Gallons per hour.
• REQ - Fuel required to way point / destination.
• USD - Fuel used.
• H:M - Endurance in hours and minutes.
• MPG - Miles per gallon


1. EGT probes must be mounted 2 to 4 inches from aircraft cylinder head.
2. If EGT clamps are too short, please buy larger clamps (available with J.P.I)
3. If EGT probes appear to be lose, please remove the probe, squeeze the thimble and reassemble.
4. Existing TIT Probe cab be used only if the aircrafts TIT probe has the same type thermocouple.

For more information on EDM 350 Aircraft Engine Monitor data manager by J.P. Instruments, please visit: https://www.jpinstruments.com/shop/edm-350/

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