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MGL Avionics
Fuel management FF-2 & FF-4
Install & User’s manual
© 2002-2007 MGL & Delta Omega
www.delta-omega.com
Page 11, june07
Note: The calibration positions may be edited by using the
and
keys. This allows you, in
theory, to copy calibration settings from one instrument to another. We however recommend that
you do go though the calibration procedure even if the two aircraft are identical in all respects.
Tolerances do exist and the calibration cancels these out.
Accurate fuel level displays are a vital safety factor for an aircraft and a very useful feature for
peace of mind during cross county flights.
Notes on Slope error
Sender value is a value determined by the FF-2 or FF-4. It is used to calculate e.g. fuel level, fuel
endurance estimate and current range estimate. The fuel tank setup sender value can either
increase in value as fuel is added on decrease in value if fuel is added. This is dependant on the
type of fuel level sender used. However should the second reading be larger than the first reading
all readings will have to be larger than the previous reading. Likewise should the second reading be
smaller than the first reading all readings will have to be smaller than the previous reading. If this is
not the case the wording "Slope error" will be displayed. This could happen when
•
fuel was removed instead of added between steps
•
no fuel was added between steps
•
the fuel level sender was moved in the wrong direction e.g. moving the fuel level sender
manually when it is not inserted in to the fuel tank.
Should you get a slope error message determine the cause of the error. If you do not know the
cause of your error it is best to start from scratch. It should be remembered that accuracy is the
fuel tank calibration is extremely important to enable your FF-2 or FF-4 to display the correct data.
Adjusting calibration points manually
You may want to set individual calibration points manually. For example you may find that your fuel
level is over reading at a specific fuel level. Correcting the tank level reading for this area can be
simply done by adjusting the calibration point. You can do this by moving the float level with your
hands to the desired position and then performing the calibration as outlined above, or you can use
the manual option.
To activate manual change of the calibration points use the
and
keys to highlight the
“Sender: ….” entry (top line of screen). Now press the Menu
key. You get:
When you are in manual mode, use the
and
keys as before to select the point you want to calibrate.
Then press the Menu
key. This allows you to
change the value at the calibration point using the
and
keys. When you are done, press the Menu
key again. To end the calibration, move the highlight
past the last calibration point as before.
