Page 48 Engine Data Management
Section 11 - Programming the Fuel Flow
Fuel Flow Parameters
Three additional parameters may be set by the pilot when the Fuel Flow
Option is installed:
K Factor—the fuel flow transducer calibration constant.
Accumulate—default is OFF: resets the fuel used to 0 every time you
inform the EDM that the aircraft was refueled. With accumulate ON,
fuel used will continue to accumulate for all subsequent flights.
GPS Communications fuel data format.
K Factor
The K factor is shown on the fuel flow transducer as a four-digit number,
which is the number of pulses generated per tenth gallon of fuel flow.
Before installing the transducer, write down the K factor here
_________. To enter the number into the EDM, place a decimal point two
places from the right of the number. For example if the K factor written on
the fuel flow transducer is ‘2912’ enter 29.12 in the EDM K factor
parameter field.
The K factor can be changed in the pilot programming procedure. When
the K factor is changed during a trip, calculations of fuel used, fuel
remaining and time to empty are not retroactively recalculated.
Fuel Flow K factor
The K factor is shown on the fuel flow transducer as a hand written four-
digit number, which represents the number of pulses per tenth gallon of
fuel flow. Before installing the transducer, record its K factor here
_________. The EDM stores the K Factor in the form 29.12, i.e. if the
transducer K factor is 2912, you would enter 29.12 in the EDM’s K factor
field.
Fine Tuning the K Factor
The K factor shown on the fuel flow transducer does not take into
account your aircraft’s particular installation. Fuel hose diameters and
lengths, elbows, fittings and routing can cause the true K factor to be
different from that shown on the fuel flow transducer.
You must use the following procedure to fine tune the K factor.
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