Fuel Flow Option Programming
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: reset the fuel used to 0 every time you
inform the EDM-760/790 that the aircraft was refueled. With
accumulate ON fuel used will not be reset to 0 when you inform the
EDM-760/790 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 transducers, write down the K factors here
(L)_________(R)__________. 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-
760/790 calculation of the fuel consumed for each flight = USD L and
USD R.
For Your Safe Flight Page 43
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