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Engine Data Management
Section 12 - Programming the Fuel Flow Option
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 not be reset to 0 when you inform the EDM that the
aircraft was refueled.
•
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 gallon of fuel flow.
Before
installing the transducer, write down the K factor here _________.
To enter the number, move the decimal point three places to the left. For
example if the K factor on the fuel flow transducer is 29,123, enter 29.12
in the K factor parameter.
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.
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.
1.
Make at least three flights of about two to three hours each. Note the
actual fuel used (as determined by topping the tanks) and the EDM
calculation of the fuel consumed for each flight = USD.