Approved Installation Manual for the Experimental Report No 104
EDM-350 Page 3 of 46 Rev A
Engine Data Management System Date 7-10-2021
Before allowing the aircraft to be flown, verify the instrument markings displayed on the EDM-350 screens are
accurate with the aircraft’s POH for every function displayed on the EDM-350.
The use of the EDM-350 requires recurring training for any pilot who will be flying the aircraft in which it is installed.
Recurring training should include reading the EDM-350 Installation Manual and seeking a flight instructor for proper
interpretation of information being displayed to the pilot.
Fuel Level Accuracy Limitations:
1. Angle of Attack - The EDM-350 must be calibrated with the aircraft in a cruise angle of attack. If
the aircraft is in an angle of attack other than cruise, the EDM-350 may display inaccurate fuel levels
(depending on the mounting location and type of sensor used). If your aircraft does not sit at a cruise
angle of attack when on the ground, it may not display accurate fuel levels. Test your aircraft at
different angles of attack to see the effects on the EDM-350 fuel level readings.
2. Full Fuel Readings - As a tank is filled the fuel sensor may not be able to detect the fuel entering
the upper corners of the fuel tank. If this is the case with your sensor, the EDM-350 will display lower
fuel levels than the actual fuel in the tanks when the tanks are full. When the fuel level drops to a
point where the fuel sensor starts to detect a change, the displayed fuel level should be accurate.
Check the accuracy of your system by comparing the displayed fuel levels on the EDM-350
to the fuel levels listed in the flight manual at each fill up.
3. Low Fuel Readings - Do not rely on the EDM-350 to determine the fuel level in the tank
for an indicated tank level below 1/8. You should always fly the aircraft in such a manner as to
maintain at least the FAA minimum fuel requirements in the aircraft at all times.
4. Improper Calibration - If the EDM-350 has not been properly calibrated it will not display accurate
fuel levels in the tanks. It is important you verify the accuracy of the EDM-350. Always crosscheck
your measured fuel levels in the tanks with the readings on the EDM-350 before each flight.
5. Poor Connections - Poor connections between the wires leading from the EDM to the fuel
sensors can become intermittent. An intermittent connection most likely will show up as wandering or
inaccurate readings on the EDM-350. Always crosscheck your measured fuel levels in the tanks
with the readings on the EDM-350 before each flight.
6. Defective Fuel Level Sensors - Fuel sensors can become intermittent or change resistance
with age. It is not uncommon to find intermittent problems even in new sensors. An intermittent
problem with a fuel sensor most likely will show up as wandering or inaccurate readings on the EDM-350.
Always crosscheck the measured fuel levels in the tanks with the readings on the EDM-350 at
each fill up. If you ever find an inaccuracy issue or any other problem with a fuel level display on
the EDM-350, troubleshoot and fix the problem before the next flight.
DETERMINE THE FUEL LEVELS IN THE AIRCRAFT.
1.The use of the EDM-350 does not eliminate or reduce the necessity for the pilot to use good flight planning,
preflight and in-flight techniques for managing fuel. It is important the pilot adopt the practices listed below. If you are
not familiar with these techniques, contact the FAA to acquire proper training.
2. Flight Planning - Always calculate the fuel requirement for each leg of a flight, including any
alternate plans for bad weather. Keep this information available in the aircraft during the
flight. Keep a chart of the published fuel flows for various flight/engine conditions in the
aircraft. Keep a chart of the measured fuel flows for various flights in the aircraft. Measured
fuel flows can be considerably different from published figures. This usually is due to old,
inaccurate engine instruments.
3. Preflight - Do not rely on the EDM-350 to determine the fuel level in the fuel tanks. The
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