By pushing the mode select switch to the right or left, you can select the various display modes. In the
FLOW Mode, the FP-5 will display fuel flow as follows:
A. When set to display in Gallons the display will read in .1 Gal/Hr increments up to 199.9 Gal/Hr.
B. When set to display in Imperial Gallons the display will read in .1 Gal/Hr increments up to 162.0 Gal/
Hr.
C. When set to display in Pounds the display will read in 1 Lb/Hr increments up to 1199 Lbs/Hr.
D. When set to display in Liters the display will read in 1 Ltr/Hr increments up to 749 Ltrs/Hr.
Special algorithms in the micro-processor are used to insure a quick response and a stable display. Also, there
are two programmable filter settings that will affect the stability and response of the fuel flow readings (see the
Pilot Programming Modes section of this manual).
The accuracy of the displayed fuel flow can be affected by the value of the K Factor and Display Update Time
programmed into the FP-5 (see the Pilot Programmable Modes section of this manual).
6. REM (Remaining) Display Mode:
In the REM (Fuel Remaining) Display Mode, the FP-5 will display the fuel in the aircraft tanks as follows:
A. When set to display in Gallons the display will read in .1 Gal increments up to 99.9 Gals. and 1 Gal
increments from 100 to 999 Gals.
B. When set to display in Imperial Gallons the display will read in .1 Gal increments up to 99.9 Gals. and
1 Gal increments from 100 to 811 Gals.
C. When set to display in Pounds the display will read in 1 Lb increments up to 1999 Lbs.
D. When set to display in Liters the display will read in 1 Ltr increments up to 1999 Ltrs.
The fuel remaining displayed by the FP-5 is not a measurement of the fuel in the tanks.
It is an amount
calculated from the starting fuel level you programmed into the FP-5, minus the fuel used while the engine was
running. When properly calibrated, the FP-5 can accurately measure the fuel used.
It is imperative the pilot
verify the calibration of the FP-5 over many tanks of fuel before using the "REM" and/or "USED" Modes as
an indication of the fuel in the tanks or fuel used. Even after verifying the calibration of the FP-5 it should
never be used as the primary indicator of fuel quantity in the tanks. It is important the pilot visually check/
measure the fuel quantity for each tank before takeoff and crosscheck these readings against the fuel level
gauges and the FP-5.
The FP-5 reminds you to do this by blinking the REM LED and displaying the current
fuel remaining in the tanks each time the aircraft power is turned on.
Also, it is important the pilot use preflight
and flight planning techniques, in accordance with the FAR's, which will help insure the proper amount of
fuel is on board the aircraft before takeoff.
While in flight the FP-5 readings should only be used to crosscheck the fuel level gauges, calculations of the
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