Fine Tuning The K Factor - J.P. Instruments EDM-900 Installation Manual

FAA Approved Installation Manual for the
EDM-900 and EDM-930
Primary Engine Data Management System

38. 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-900 calculation of the fuel used for each flight USD.
Fuel USED shown by EDM
Flight (total tank - REM)
1
2
3

Total
2. Total  the EDM-900 calculated fuel used and  the actual fuel used.
3. Record the current K factor here ____________________ and in the table below.
4. Calculate the New K factor as follows:
New K factor = (EDM fuel used) x (Current K factor)
New K factor = (
Every time you fine tune the K factor, change it by only half of the amount calculated above, and record the
measurements here:
 EDM
Date fuel used
Actual fuel used by topping tanks

(actual fuel used)
) x (
(
 actual  Current
fuel used K factor
)
)
New K factor Pilot's
=  x  / 
initials
Report No 908
Page 37 of 56 Rev I
Date 1-18-2013