Approved Installation Manual for the Experimental Report No 104
EDM-350 Page 20 of 46 Rev A
Engine Data Management System Date 7-10-2021
• Never add or remove fuel from the aircraft when the master switch is turned on.
• Fuel quantity gauge performance is affected by many factors, such as the integrity of
the sensor performance, the accuracy of the calibration data you collected and
entered and most importantly your validation that the EDM fuel quantity gauge is
accurate and repeatable after installation and calibration. You should not use the
fuel quantity gauge system for any flight related operations until this validation
criteria has been met.
• JPI strongly recommends replacing the fuel quantity senders before calibration.
DO NOT RELY SOLELY ON THE FUEL LEVEL DISPLAYED ON THE EDM-350 TO
DETERMINE THE FUEL LEVELS IN THE AIRCRAFT. 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.
19.3 Voltage Output Type Sender System
Voltage output type systems usually have a convertor box. This is typical with the ‘Pennycap’ brand capacitive
sender system. The Pennycap convertor box measures sender capacitance and converts it to a DC voltage output
signal for the aircrafts fuel level gauge. In some cases the Pennycap convertor box alternately monitors two tanks
per wing controlled by cockpit selector switch positions. This is typical for Cessna’s having 4 selectable tanks. The
EDM can interface to this system with the addition of the interface hardware (PN 791802). NOTE: This drawing is
sent with the kit if applicable and is accurate for most models of the Pennycap system; however it is the installer’s
responsibility to verify proper connections to the Pennycap output signal.
19.4 Fuel Tank Calibration Setting Fuel Calibration Points
The EDM interfaces to various fuel level sensor types to facilitate direct reading of the fuel level in the aircraft fuel
tanks. The EDM has a multi-point fuel calibration table that you must enter. This table contains calibration values
(stored in non-volatile memory) used to translate sensor readings into the displayed fuel quantity values. The
calibration information is collected and recorded on paper for later entry into the EDM. NOTE: Fuel quantity gauges
will not be functional until the fuel calibration information has been entered into the EDM. You will use the EDM
instrument itself as the measuring device to collect calibration data.
The following describes the basic procedures necessary for collection and entry of data into the fuel level calibration
table. Note: Any changes to fuel table data will be temporary until you execute the ’SAVE’ function (available after
last cell of the last tank table is entered).
Before beginning the fuel table entry/edit process, you must have properly installed and tested for correct
functionality of the fuel sensors with the airplane in flight attitude.
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